Gravity Simulator
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl
General >> Discussion >> Welcome (Terms of Use)
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1153225958

Message started by abyssoft on 07/18/06 at 05:32:37

Title: Welcome (Terms of Use)
Post by abyssoft on 07/18/06 at 05:32:37

Account validation thread, standing members need not reply.

New accounts need to post here, to finalized validity of account.



Repeated here is the User Agreement


You agree, through your use of this YaBB forum, that you will not post any material which is false, defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise in violation of ANY law. This is not humorous and legal actions can be taken against you. You also agree not to post any copyrighted material unless the copyright is owned by you or you have consent from the owner of the copyrighted material. Spam, flooding, advertisements, chain letters, pyramid schemes, and solicitations are also inappropriate to this YaBB forum.

All new members agree to post to the "Welcome" thread to further validate there account, failure to do so within 1 week of registering will see said account deleted.  your post in this thread is not permanent and will eventually be deleted after proper record of account validity has been determined.

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Title: Re: Welcome
Post by thejames on 07/20/06 at 06:39:36

I had to do something similar for my own board...  actually I've been able to trace many of the spammers on my board from the ukraine...  so I've started banning IP addresses.  

So far my daily fake-account-kill numbers have dropped to zero, but I'm sure they'll find another way around a ban.

Title: Re: Welcome (Terms of Use)
Post by cheesehead on 08/12/06 at 08:01:34

Hi,

I've just re-registered after being dropped for inactivity.  A series of hard-/software problems distracted me for too long.  :(

Title: Re: Welcome (Terms of Use)
Post by mkruer on 08/19/06 at 21:40:29

I have had the same issue for the forums I run. Unfortunately IP banning sometime doesn’t work. If you have a light traffic, I would just manually authorize people. Make them wait 24hrs for a response.

Title: Re: Welcome (Terms of Use)
Post by Rob on 09/02/06 at 09:17:55

While I have not experienced it myself, I know how some friends of mine have had their Yahoo groups disbanded because of sabotage.

Rob

Title: Re: Welcome (Terms of Use)
Post by Tony on 09/02/06 at 10:11:45

Welcome, Rob.  They're working hard to bring us down too, but Abysoft is on top of it  ;)

Title: Re: Welcome (Terms of Use)
Post by Belegaer on 09/14/06 at 03:35:40

Hi, I'm new here and I have registered because I have got few surprising  (for me) results when using gravity simulator (superb software!). So I'm about to open new thread with my question/questions  :)

Title: Re: Welcome (Terms of Use)
Post by Mal on 10/08/06 at 21:19:35

*poke*

Just posting to say "yes, I'm a real person" :)

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 10/09/06 at 08:21:42

Welcome aboard  ;D

Title: Re: Welcome (Terms of Use)
Post by later on 11/12/06 at 17:28:00

Well now................just downloaded.....this should be very interesting!

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 11/12/06 at 21:27:33

Welcome Aboard hope you enjoy it as much as we do.

Title: Re: Welcome (Terms of Use)
Post by Chilinuttz on 02/12/07 at 13:23:06

Hello everybody  ;D

I was just browsing and found this cool sim. Got one question though,is timedilation gonna be implemented in this sim ?

Title: Re: Welcome (Terms of Use)
Post by Tony on 02/14/07 at 22:14:33


Chilinuttz wrote:
Hello everybody  ;D

I was just browsing and found this cool sim. Got one question though,is timedilation gonna be implemented in this sim ?

Hi, welcome.  I don't plan on adding that in the near future, but this an on-going project, so maybe one day.  Time dialation is not very significant in the types of simulations this program is good for.  It takes millenia of computer sim time just to model Mercury's precession, and compare it to what it should be when GR is accounted for.

Again, welcome.  I hope you stick around.

Title: Re: Welcome (Terms of Use)
Post by Planet_X on 02/16/07 at 14:42:44

Hello, everyone.

Sorry I haven't posted in awhile.  That will change soon, as I've recently completed some of the projects that have consumed so much of my time.  Anyway, I've actually been using Gravity Simulator for quite some time now.  I mainly use the program to help out with orbital computations in (mostly fictional) planetary systems that I create or help create for the Celestia program.

At any rate, Gravity Simulator is a great program that I will no doubt continue to use.  Later!

JP Dunning

Title: Re: Welcome (Terms of Use)
Post by FlyingSinger on 03/18/07 at 14:24:53

Hello all,

Bruce here, dabbler in all things spacey, optical engineer, JPL Solar System Ambassador (volunteer educator), and blogger (http://flyingsinger.blogspot.com).

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 03/18/07 at 21:40:03

Welcome aboard glad to have you.

Title: Re: Welcome (Terms of Use)
Post by frankuitaalst on 04/05/07 at 08:25:57

Some hot star seems to be arrived .
Can someone remove it , him , her ?

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 04/05/07 at 09:33:16

TY The issue has been handled and security proceedures modified to help slow them down for a bit.

Title: Re: Welcome (Terms of Use)
Post by Grumpster on 04/15/07 at 02:15:36

Hey pplz.

New here.

Came to ask a q.

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 04/15/07 at 21:49:59

Welcome aboard, ask away and who ever catches the question first will answer  ;D

Title: Re: Welcome (Terms of Use)
Post by publius on 04/22/07 at 19:14:11



         This is publius, registering myself here. Thanks for the message Tony, I didn't see this. :)  -Richard

Title: Re: Welcome (Terms of Use)
Post by Sublyme on 05/04/07 at 13:25:24

Why hello there.

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 05/04/07 at 21:43:22

Welcome aboard  :D

Title: Re: Welcome (Terms of Use)
Post by zlreitz on 05/13/07 at 18:15:11

Hey there, I'm one of sublyme's friends.

Title: Re: Welcome (Terms of Use)
Post by Tony on 05/13/07 at 22:05:41


zlreitz wrote:
Hey there, I'm one of sublyme's friends.

Now we are your friends too.  ;)
Welcome.

Title: Re: Welcome (Terms of Use)
Post by shellandtube on 06/13/07 at 18:57:52

Hi Everyone!
Excellent software, came across it after trying (and failing  :'() to make a solar system model with matlab.
Keep up the good work  8-)

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 06/14/07 at 04:57:52

Glad to have you join us.  Enjoy, discuss, experiment and convo.

Title: Re: Welcome (Terms of Use)
Post by frankuitaalst on 09/12/07 at 10:10:32

I saw we registered today our 50th member !! ::)

Title: Re: Welcome (Terms of Use)
Post by david on 09/14/07 at 16:37:20

Make that 51. Would like to learn how to use this software and hoping some of the members can be of help!

Title: Re: Welcome (Terms of Use)
Post by Paul on 10/06/07 at 08:23:16

I have been working with GravitySimulator  alot, but I am just now registering.

Title: Re: Welcome (Terms of Use)
Post by Tony on 10/06/07 at 14:59:42

Welcome to the forum.  Feel free to join our discussions.  Do you have a copy of the latest Beta version?  http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1176774875


Title: Re: Welcome (Terms of Use)
Post by silent_protagonist on 11/27/07 at 16:44:17

hi

This is a fun program, now I can be a nerd 5x as efficiently  ;D

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 11/27/07 at 20:24:38

Welcome abort Glad you joined us.

Title: Re: Welcome (Terms of Use)
Post by plkoehn on 01/17/08 at 09:19:32

Hello!  Real person here!  Thanks for the great software package - I'll be coming up with lots of good exercises for my undergrads...

Patrick Koehn
Asst. Professor
Eastern Michigan University
USA

Title: Re: Welcome (Terms of Use)
Post by Tony on 01/17/08 at 16:00:45


plkoehn wrote:
Hello!  Real person here!  Thanks for the great software package - I'll be coming up with lots of good exercises for my undergrads...

Patrick Koehn
Asst. Professor
Eastern Michigan University
USA

Welcome!
Be sure to keep us informed of your excercises.  One day I want to put together a lab manual of things students can try.

Title: Re: Welcome (Terms of Use)
Post by guyy on 02/05/08 at 15:49:12

Member #56 added to the pile...

I'm actually working on my own gravity-simulating program (also in VB6, oddly enough...), which is worse in some ways than yours but better in others, as you'll soon see if I can figure out where the attachment button is. :P

Title: Re: Welcome (Terms of Use)
Post by Tony on 02/05/08 at 16:15:27

You may need to have a certain number of posts before the attachment button appears.  And it probably doesn't accept .exe files for obvious reasons.   You could e-mail it to me if you like and I can post it for you.

Welcome to the forum. :)

Title: Re: Welcome (Terms of Use)
Post by RedStreak on 02/09/08 at 15:40:57

Hello I'm RedStreak.  I joined this forum because I needed a simulator help me create fictional planets.

Title: Re: Welcome (Terms of Use)
Post by Tony on 02/10/08 at 12:43:41

Welcome RedStreak!

Once you get the hang of it, you should have lots of fun creating systems.

Title: Re: Welcome (Terms of Use)
Post by LordHyperbole on 03/18/08 at 12:16:19

Hey,

I'm LordHyperbole.  So named because I keep losing planets...  

I'd like to say thanks for making this software freely available. I write science fiction & fantasy, and since I found it a few days ago, I've been trying to find a configuration in which something resembling the stellar system I want will remain stable long-term.  A few of my planets are well behaved and were still happy after 350 Ma., at least, but the rest had bought a one-way ticket out of town during the night...

My maths knowledge isn't up to the task.  I'm hoping to pick up a few pointers from folk who really know what they're doing.  

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 03/18/08 at 13:13:02

Welcome any questions you have ask away and the will get answered may take a little time but they will be answered.

Title: Re: Welcome (Terms of Use)
Post by Thagur on 03/23/08 at 07:48:39

Yo!

Hello, my name is... err... Thagur!

I have some issues with the software.. I can't figure it out. The tutorial is not good enough, if you ask me. It explains what the different dialog boxes do and how the menus work in a good way. But it would be great if there was a tutorial for, say, putting a planet in orbit around another planet. Like: "Now we are going to put planet B in orbit around planet A." And then explain it step by step. Like:
"1. Click here to bla..bla..bla.
2. Click there to bla..bla..bla.
3. Input numbers over here to set the bla..bla..bla.
4. Press play and sit back. Enjoy!"

A lot of words here I know. I hope you don't think I am angry, cause I am not. It would just have been much better if there was explanations too, and not just "this can do that, and that can do this." I hope you know what I mean.

Greetings from Thagur!

Edit: Another way of putting it: Some "how to's" would be great.

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 03/23/08 at 07:57:14

Welcome aboard and thank you for the feed back

Title: Re: Welcome (Terms of Use)
Post by Tony on 03/23/08 at 12:23:29

Hi, Thagur,

Try this:

I. File > New
A. Objects > Edit Objects
B. Change "Name" from "Object 1" to "Sun"
C. Change "Color" to "Yellow"
D. Press OK.
E. Press the [-] button on the screen scale interface until it reads > 4AU

II. Objects > Create Objects
A. Name: Earth
B. Mass: 1 Earth Mass
C. Diameter: 1 Earth Diameter
D. Semi-major axis: 1 AU
E. Press Create
F. Sit back and enjoy watching the Earth orbit the Sun!


III. Use the Focus Object interface and choose Earth
A. Use the Screen Scale interface and zoom in until Earth is larger than a single pixel.
B. Objects > Create Objects
C. Name: Moon
D. Mass: 0.0123 Earth masses
E. Diameter: 3000 km
F. Semi-major axis: 384000 km
G. Press Create.
H. Sit back and enjoy the Moon orbit the Earth!

This should get you started.  If you want, you can look up more accurate values for the Earth and Moon' orbital elements, including inclination and eccentricity.
There's also lots of step-by-step explanations in this forum.

If you need help using the program, make sure to ask here.  We'd love to see the simulations you create.
Welcome!

Title: Re: Welcome (Terms of Use)
Post by Thagur on 03/23/08 at 14:57:24

Thanks. It's late at night here now. I'm the guy with the "Gravity Simulator crashes when starting up"-topic. I emailed you earlier today, Tony. Thanks for the Beta-files in your reply. It runs perfectly now. Thanks!

I have yet to try the tutorial you gave me. Looking forward to it now that the program is working.

Cheers!

Thagur

Title: Re: Welcome (Terms of Use)
Post by Dan on 04/15/08 at 12:36:24

Hello...

I've been following this board for some time. I really enjoy the different "what if" scenarios that are discussed.

Title: Re: Welcome (Terms of Use)
Post by tallbloke on 06/08/08 at 15:32:01

Hi all, Tallbloke here.
Just found the site and software, which is the best gravity simulator!
Many thanks again to Tony and Frank for helping me get going with the sims I need to work on.

Cheers!

Title: Re: Welcome (Terms of Use)
Post by mazda on 10/14/08 at 07:43:42

Hello everyone,

My name is Henrique Mazda, I am student of physics at the University of São Paulo, Brazil, and have interest in the study of TNOs.

In spite of my recent registering in the forum, for some time I followed the discussions about the simulations of the interesting Gravity Simulator.

I hope now take courage to contribute with some ideas.  :)


Cheers

Henrique Mazda

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 10/14/08 at 12:37:58

Glad to have all the new comers on board :) and looking forward to the discussions :-? that will result

Title: Re: Welcome (Terms of Use)
Post by mazda on 10/14/08 at 15:14:17

Thanks abyssoft !!






Title: Re: Welcome (Terms of Use)
Post by Mal on 10/14/08 at 17:15:39


mazda wrote:
Hello everyone,

My name is Henrique Mazda, I am student of physics at the University of São Paulo, Brazil, and have interest in the study of TNOs.

In spite of my recent registering in the forum, for some time I followed the discussions about the simulations of the interesting Gravity Simulator.

I hope now take courage to contribute with some ideas.  :)


You can use gravity simulator to check out the various Neptune:TNO resonances and see what happens... best thing to do is just play around and come up with your own scenarios and see if anything interesting shows up (I wonder if one could try out a Capture scenario for Triton?)

Title: Re: Welcome (Terms of Use)
Post by NeutronStar on 11/13/08 at 14:51:35

Hello!!! I'm new and GS and US are awesomE!

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 11/16/08 at 19:37:29

welcome aboard

Title: Re: Welcome (Terms of Use)
Post by Bogomip on 11/19/08 at 02:24:25

Hello!

I am a student studying physics at University and have an interest in programming and the solar system! :)

I decided to register here so i could ask some advice to help progress a program I am making and better understand some of the finer points of orbits.

Thanks
Alex

Title: Re: Welcome (Terms of Use)
Post by NeutronStar on 12/12/08 at 18:18:44

Wait did i posty here?

Title: Re: Welcome (Terms of Use)
Post by WingedSkiCap on 01/02/09 at 11:25:04

I'm posting here because I got a message that said to...

----
Pi is yummy :D

Title: Re: Welcome (Terms of Use)
Post by kheider on 01/27/09 at 10:34:23

Hello All;

Just confirming my account.  I am a Wikipedia editor.  Wikipedia takes MMORPG (Massively Multiplayer Online Role-Playing Game) to a hopefully a useful level.  It is more productive than online chess.
http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_is_an_MMORPG

I have always wanted to learn how to use GravSim to generate graphical near resonance circulations and other orbital simulations for use on Wikipedia.

Two articles that I know refer to GravSim are:
http://en.wikipedia.org/wiki/2007_WD5#External_links
http://en.wikipedia.org/wiki/Eris_(dwarf_planet)#Orbit

-- Kevin Heider
(No need to delete this post.)

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 01/27/09 at 12:40:06

Glad to have you aboard I'm a Wikipedia editor of the same name, main focus for me is in SSSB's

Title: Re: Welcome (Terms of Use)
Post by Maurol on 01/27/09 at 18:50:10

Hi Hi,

Thanks for this wonderful program. I'm new to the field, and taking a quick course in celestial mechanics :-)

I want to know how to use gravsim to observe (and measure) the precession of the perihelion of a planet, typically, Mercury.
I suppose I have to zoom in close to Mercury's orbit, take note of the values of the classical orbital elements near perihelion, and after that compute the perihelion using an external tool, but I'm not sure if there's an easier way.

If I do that for each orbit, I should be able to observe the precession of the perihelion, right?
And that precession would not include the relativistic effect, right?

Any suggestions? what tools/formulas can you recommend me to use?

Thanks,
Mauro

Title: Re: Welcome (Terms of Use)
Post by Tony on 01/27/09 at 19:40:49

Hi, welcome!

I replied to your question in the "relativistic effects" thread on the main discussion board:
http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1232435733/0

Title: Re: Welcome (Terms of Use)
Post by harryson on 02/12/09 at 06:07:48

Hi, thanks for this fantastic program..

Harryson

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 02/12/09 at 10:32:40

Glad to have you join us

Title: Re: Welcome (Terms of Use)
Post by chemist on 02/27/09 at 13:35:10

k

Title: Re: Welcome (Terms of Use)
Post by n0mad23 on 04/02/09 at 13:36:30

I've returned after a long absence due to computer hardware issues, and my relocation back to the Pacific Northwest.  I'm sure glad to see all the updates (both in beta software and scenarios).

Great work, Tony!

Title: Re: Welcome (Terms of Use)
Post by Glenn on 04/03/09 at 07:47:43

This is Glenn with my first message on the GravitySimulator.com message area.

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 04/05/09 at 13:42:15

Glad to have you join us  ;D

Title: Re: Welcome (Terms of Use)
Post by vidthekid on 04/16/09 at 17:34:54

This is my first post.  I am a human.  A human who wants help operating the Gravity Simulator program...

* goes to look for the appropriate place to post his question...

By the way, the activation link in the email didn't work.  On a hunch, I changed the semicolons to ampersands, and that worked.

Title: Re: Welcome (Terms of Use)
Post by Tony on 04/16/09 at 18:56:47

Hi, and welcome!
Can you forward me the activation e-mail and I'll have a look.
tony@gravitysimulator.com
Thanks for your documentation comment.

Title: Re: Welcome (Terms of Use)
Post by eoinmcmahon0 on 05/07/09 at 09:48:35

Hello, I couldn't help but download this simulator which I found linked from Wiki. Fun fun fun. When somebody tells me gravity only attracts, I can show them this.

I am a real person, not a bot.

Eoin

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 05/07/09 at 17:50:43

glad to have you on board  ;D

Title: Re: Welcome (Terms of Use)
Post by mail11325 on 06/03/09 at 13:23:51

Hello from Charleston, SC

Title: Re: Welcome (Terms of Use)
Post by Tony on 06/03/09 at 18:52:39

Welcome!  I hope you participate in our discussions.

Title: Re: Welcome (Terms of Use)
Post by Ryuu on 06/17/09 at 18:28:42

Hi everyone!

I came across your program while looking for cheep/free good simulators that I hope can help me verify the stability of some hypothetical systems (yeah, "another Trekkie/B5/&other sci-fi nut" ::) ).

I saw that several folks here have devolped some interesting results from playing around with it, so this looks like I finally found a good starting place.

I know I'm going to have LOTS of questions once I've downloaded the simulator, so just warning you all in advance! ;D

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 06/17/09 at 21:13:05

Glad to have you aboard

Title: Re: Welcome (Terms of Use)
Post by ELuengo on 07/08/09 at 06:47:19

Hello everyone from Spain! Yesterday i found this great program and i just can't stop making experiments on it! I have some questions but i will post them on a different thread.
Thank you for this great piece of software Tony!

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 07/08/09 at 07:32:08

Always glad to have new members, it helps liven things up

Title: Re: Welcome (Terms of Use)
Post by Riptokus on 07/26/09 at 20:24:24

Hey, doing book research and your gravity simulator came up. I'm a little confused with the whole system, since if it is put in too fast of a speed in a full system it ejects earth a little more than half a light year outside the system after less than 300 years. The same simulation done slower has a much greater stability, with only a few shots at random galaxies by Jupiter's moons.

Title: Re: Welcome (Terms of Use)
Post by Tony on 07/27/09 at 23:18:22

Hi and welcome!
Any numerical simulation loses accuracy with large time steps.  Keep your time step under 2048 to retain reasonable accuracy for solar system simulations.  Depending on what you're trying to do, you can adjust this accordingly.  If you post here, you can receive help on setting up your systems.

Title: Re: Welcome (Terms of Use)
Post by selden on 08/11/09 at 04:18:12

Tony,

I've (finally) downloaded GravitySimulator and would like to try to use it to develop some spacecraft trajectories. One of the orbitsimulator web site's pages describes a simulation with accelerating particles. Unfortunately, its link to the configuration file gets a "page not found" error.
The Web page is http://www.orbitsimulator.com/gravity/articles/spiral.html
The broken link is http://www.orbitsimulator.com/gravity/articles/sprial.gsim

Is there a typo in the url or is the file actually missing?

Thanks for whatever help you can provide.

Title: Re: Welcome (Terms of Use)
Post by Tony on 08/11/09 at 09:20:31

Hi Selden.  It's great to have you here!
There was both a typo (I misspelled spiral as sprial), and the directory was wrong.  I've fixed both, so it should work now.

Be sure to upgrade to the latest beta version.  Download these files into your Gravity Simulator folder, and use the exe rather than the gravitysimulator.exe from the install.

http://orbitsimulator.com/gravity/beta/GravitySimulatorBeta2009February25.exe
http://orbitsimulator.com//gravity/beta/CodeOptomizer.dll  
http://orbitsimulator.com//gravity/beta/resume.gsim

What kind of trajectories are you going to model?

Title: Re: Welcome (Terms of Use)
Post by Astrella on 08/11/09 at 10:29:18

Hi group,

i'm Astrella from Germany. If we have clear skies i like viewing the sky through my Meade LX200 12" in my backyard observatory.

Yesterday i got a question, how our solar system will behave, if one of this planets would vanish.
Well, i found Tony and his fine program. But i had no fun with the program. The program could be startet only once. The second time i got only a black background and it could not be closed the normal way by clicking the close button.

So i registered here and found the beta thread. I downloaded feb version 2009 and its an amazing peace of software Tony created.

Thanks Tony, i already could show a friend what happens when e.g. Jupiter would be removed from our solar system.

Title: Re: Welcome (Terms of Use)
Post by selden on 08/11/09 at 11:01:51

Tony,

Thanks, a lot!

I'm trying to illustrate some of the stories by C.J. Cherryh, so some of the trajectories aren't the kind current spacecraft can follow. I'll post a separate thread about the project.

Title: Re: Welcome (Terms of Use)
Post by Tony on 08/11/09 at 12:02:19


Astrella wrote:
Hi group,

i'm Astrella from Germany. If we have clear skies i like viewing the sky through my Meade LX200 12" in my backyard observatory.

Yesterday i got a question, how our solar system will behave, if one of this planets would vanish.
Well, i found Tony and his fine program. But i had no fun with the program. The program could be startet only once. The second time i got only a black background and it could not be closed the normal way by clicking the close button.

So i registered here and found the beta thread. I downloaded feb version 2009 and its an amazing peace of software Tony created.

Thanks Tony, i already could show a friend what happens when e.g. Jupiter would be removed from our solar system.


Hi Astrella.  Welcome!
I regularly use LX200s.  I have access to my university's observatory which is a 10 minute walk from my house.  We have 2 LX200 12" and an LX200 16".  But skies here are usually overcast, and light pollution is a big problem.  It was cloudy last night, so I missed the Saturn ring plane crossing.

As you found out, Gravity Simulator 2.0 doesn't work well with European versions of Windows.  That's because they store numbers using commas instead of periods for decimals.  But the Beta version solves this problem.  Any time you perform an experiment, post the results here!

Title: Re: Welcome (Terms of Use)
Post by sparky on 08/21/09 at 04:20:52

Hi,

I'm Sparky and I am new here.  I love playing around with Gravity Simulator.  I live in Kansas and we have really nice dark skies here.  

Is there a way to get an oblique view of a star system in Gravity Simulator?

Oh, BTW, I agree to the terms of use, too.

Thanks,
Sparky :)

Title: Re: Welcome (Terms of Use)
Post by Tony on 08/21/09 at 17:42:32

Hi Sparky.
Welcome to the forum.  Glad you like the software.

Try the scroll bar on the right of the screen to change viewing angles.

Title: Re: Welcome (Terms of Use)
Post by Digital Dod on 09/23/09 at 05:22:34

Hi,

I just found your simulator when searching for solar sail calculators. I'd done a trivial calculator many years ago when first learning web scripting and wanted to try to do something more capable. A brief look at your program suggests I can do something adequate by using the auto-pilot although some straightforward enhancements to the sim would help greatly. Do you have a "wish list" thread  ;)

I note the board says "IP logged", will posts from other IPs be rejected or is it only logging? I expect to be accessing the board from home and work (lunch time only of course).

Best regards
George

Title: Re: Welcome (Terms of Use)
Post by harryson on 09/25/09 at 07:46:44

Hello everyone,  ;)

Title: Re: Welcome (Terms of Use)
Post by Tony on 09/25/09 at 09:12:50


harryson wrote:
Hello everyone,  ;)

Hi.  Welcome back!

Title: Re: Welcome (Terms of Use)
Post by Camster on 11/14/09 at 03:30:56

Hi all, just registered

Title: Re: Welcome (Terms of Use)
Post by Milkbone on 11/25/09 at 02:20:19

Hello all;
 
Hope this is the correct place to post don't do much posting, I just registered today, been taken back at what a remarkable freebie this is.  I've been looking for some time.  Now, I have to learn to master it.  Thanks!

Again I hope this correct place for this post


Title: Re: Welcome (Terms of Use)
Post by Tony on 11/25/09 at 11:40:05

Welcome.  This is the right place to post.  You can make comments and ask questions in the discussion forum.

Title: Re: Welcome (Terms of Use)
Post by Graybug on 12/26/09 at 10:31:56

New member...first post. Guess that makes me "official" now.

Title: Re: Welcome (Terms of Use)
Post by Tony on 12/26/09 at 12:36:06

Welcome!  Yes, you are now official.

Title: Re: Welcome (Terms of Use)
Post by Grumpster on 01/09/10 at 02:25:18

haven't posted in a long while. but i love this program. :P

Title: Re: Welcome (Terms of Use)
Post by stom10 on 09/26/10 at 06:14:39

Just joining up to talk with others about simulation programming methodology and such. I'm an undergraduate Computer Engineer who is very interested in the simulation of Physics problems and chemical processes. This program seems like a very good example of well executed simulation. Imagine my surprise when I clicked a link from a post on PhysicsForum in 2004 and came here to a site still active some 6 years later. Good job maintaining such a complex project, Tony.

Title: Re: Welcome (Terms of Use)
Post by Tony on 09/26/10 at 11:43:54

Welcome.  I hope you stick around.

Title: Re: Welcome (Terms of Use)
Post by TRILLIUM on 09/26/10 at 15:31:44

HELLO ALL
Just a quick note to make this offical

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 09/26/10 at 17:03:30

Welcome :D hope to see you keep coming back.

Title: Re: Welcome (Terms of Use)
Post by Cygnus2112 on 11/09/10 at 17:11:27

hello! this program looks pretty cool :D ive been using it for a few days now.
is there any way to see how many objects are in the sim without counting them out? if there is, i couldn't find it. i started a planet formation sim yesterday and i thought it would be a good feature if there was a window you could open that tells you how many objects there still are (to record collisions), and what the biggest/most massive object is.

Title: Re: Welcome (Terms of Use)
Post by Tony on 11/09/10 at 17:29:56

Hi Cygnus2112.  Welcome!
You are encouraged to update to the latest Beta version of the program.  There is a thread in this forum that tells you how.  The following features I describe might only be available in Beta.

If you press menu Objects > Delete Objects, then press "Select All", then hit "Delete" you will be given a warning prompt:  "Do you wish to delete these 112 objects?" Then press "No" so you don't delete your objects.  Now you know how many there are!

Gravity Simulator creates a file called collisions.dat which should be readable in any text editor.  This file should be in your GravitySimulator folder.  It records the time of each collision, as well as the objects that collided.

There currently is no way to quickly identify the biggest/most massive object.  You could open the Objects > Edit objects, and scroll down the dropdown list while keeping an eye on the mass value.

Title: Re: Welcome (Terms of Use)
Post by rsanchez on 11/10/10 at 23:22:48

Hi there. I'm very interested in gravity simulations. I made one myself. It's based on yet another gravity simulation, Planets by Yaron Minsky. I joined because Gravity Simulator seems to have a lot of interesting simulations that I'd like to run on my simulator, and I'll probably have questions. Anyway, if you're interested, here's the link to my simulator: http://rsanchez1.github.com/Grav/

I should note that you should visit that link on the latest versions of Chrome, Firefox, Safari, or Opera, or Internet Explorer 9, if you want to run the simulation.

There is also a version available on webOS devices if anyone here uses a Palm Pre or Pixi.

Title: Re: Welcome (Terms of Use)
Post by Mal on 11/16/10 at 12:20:47


rsanchez wrote:
Hi there. I'm very interested in gravity simulations. I made one myself. It's based on yet another gravity simulation, Planets by Yaron Minsky. I joined because Gravity Simulator seems to have a lot of interesting simulations that I'd like to run on my simulator, and I'll probably have questions. Anyway, if you're interested, here's the link to my simulator: http://rsanchez1.github.com/Grav/

I should note that you should visit that link on the latest versions of Chrome, Firefox, Safari, or Opera, or Internet Explorer 9, if you want to run the simulation.


Cool. I tried some of the named system (Gliese, Pegasi, etc) and didn't see anything, but the 'artificial' systems (e.g. the cannon, four body system etc) were visible and worked. This was in Firefox 3.0.15.

Title: Re: Welcome (Terms of Use)
Post by rsanchez on 11/20/10 at 18:36:07

You don't see anything because I had changed the default zoom so that you can better see things on a mobile browser, since I wanted to test some systems (two-body, four-body, and cannon) on-the-go. I set it up so distances are approximately 1km/pixel at 1x zoom, and at the default -1000x zoom, if the canvas size is 1200x800, you'll see a 1200000x800000 km window of space. Considering that Neptune is approximately 4.5x10^9 km away from the Sun, and even Jupiter is approximately 7.8x10^8 km away from the Sun, a window 1.2x10^6 km wide is pretty small. I think I'll probably change the zoom to see those systems by default in a web browser, since I just ported the web app to a mobile app instead.

The named systems aren't too scientifically accurate. I just created them to get a sense of the scale of extrasolar systems. The radii of the planets are also not at all accurate, since I set them up so I can actually see them orbiting the Sun without having to zoom in too much, but that will probably change as well since I'll change how bodies are rendered if they're too small to be seen at the current zoom level.

If you want to try something nice, I recently added the ability to view horseshoe orbits. Just select the Sun-Jupiter System, press R to go into a rotating reference frame, press T to turn on trace, and hold M to extend trace length until the trace doesn't get erased.

Title: Re: Welcome (Terms of Use)
Post by tester on 12/15/10 at 10:45:38

I'm just testing my new account.  My name is tester.

Title: Re: Welcome (Terms of Use)
Post by tester2 on 12/15/10 at 10:55:26

I've successfully changed my name to tester2 without affecting my previous posts.

Title: Re: Welcome (Terms of Use)
Post by EDG on 12/15/10 at 12:18:59


tester2 wrote:
I've successfully changed my name to tester2 without affecting my previous posts.


Oh hey, that works. I just changed my name myself (from Mal to EDG)! I found something in the PM Preferences box page lets me do that (which is odd, as on other boards people usually aren't allowed to change their own usernames themselves).

Title: Re: Welcome (Terms of Use)
Post by phoenixshade on 01/19/11 at 19:26:12

Posting in an epic thread. I am not a spambot.

Title: Re: Welcome (Terms of Use)
Post by abyssoft on 01/20/11 at 07:53:34

Welcome and enjoy.

Title: Re: Welcome (Terms of Use)
Post by Bob on 01/23/11 at 11:02:11

Just a quick message to say that I exist; I think!

Title: Re: Welcome (Terms of Use)
Post by Bob on 01/25/11 at 11:12:49

Just a quick test to see that I can post. Anyway I got the beta version up and running, so I'll be trying out what's different about it.

Title: Re: Welcome (Terms of Use)
Post by Bob on 01/25/11 at 11:26:10

Great that works okay  :) As I said, I've mentioned this app to someone working on his planet x generator plugin for Cinema 4d. Cinema can import spread sheet type data, as can all of the 3d software that's used for almost photo real animations. It might be a bit of a faff to do it but I think it would be worthwhile.

An instance of this. Once a guy came on a 3d board and announced that he'd got a NASA contract for a Mars lander. He then said he'd ask if he could put the drawings up!!! To everyone's credit, he was told not to do anything so silly.

Anyway as stated in an earlier post an image done with planet x generator of a Mars with an ocean.

Title: Re: Welcome (Terms of Use)
Post by ledbedder20 on 02/04/11 at 05:45:48

Hello! My name is Seth, I live in MD and I've been studying the cosmos and it's movements for years. I've often thought of how useful a program like this would be and now I've finally stumbled upon it! I'm really appreciative of your work, thank you so much for sharing this important knowledge.

Title: Re: Welcome (Terms of Use)
Post by nascarnik on 04/01/11 at 15:48:39

hello everyone this is actually the second time ive registered for this site but the first time i didnt get the memo about posting within a day so it got deleted
Either way ive used this program for at least 4 years and still love using it

Title: Re: Welcome (Terms of Use)
Post by Tony on 04/11/11 at 21:45:11

Welcome!  I'm glad it worked for you this time.  I hope you stick around.

Title: Re: Welcome (Terms of Use)
Post by Stardust on 05/25/11 at 21:41:25

Hi,

I started the sign up process 43 days ago but only be able to login today. Was it just me or does any one else having difficulty with this YaBB interface?

Stardust

Title: Re: Welcome (Terms of Use)
Post by Tony on 05/26/11 at 12:09:21

Welcome.  I'm glad you made it.

Title: Re: Welcome (Terms of Use)
Post by wil on 05/29/11 at 07:49:33

Hello!

Title: Re: Welcome (Terms of Use)
Post by Tony on 05/29/11 at 17:09:19

Hi Wil.  Welcome!

Title: Re: Welcome (Terms of Use)
Post by coveysd on 07/22/11 at 13:18:05

Hi. I installed GS 2.0, which runs nicely but slower than I hoped.

I tried to run three different betas (22-APR-07, 01-Feb-11, and 08-Jun-11), the earlier ones to try to set intervals to 1 second per some of the comments.

While the base GS 2.0 works, none of the betas do. They consume 100% CPU and stop responding so I have to terminate them. I tried letting windows do its compatability thing, and it appeared to work briefly but failed to load another gsim.

For the 22-Apr-07 version, I created a new directory and populated it with the new codeoptomizer.dll and resume.gsim per the instructions. No luck.

My primary interest is in modelling asteroid orbits and their modification, so I'm most interested in running A2004MN4.gsim and variants of it. But I can't get it to work at all with the betas.

I have a Windows 7 64-bit OS, running on a Sandy Bridge (Intel) Core I7 processor (would be nice if it could use more than one, but I understand).

Any suggestions?

Title: Re: Welcome (Terms of Use)
Post by Tony on 07/23/11 at 16:02:18

Hi and welcome.
I'm out of town for a week and internet is spotty, so if I don't reply quickly, that's why.

Let me just cover the basics of running betas.
1.  You must first have installed Gravity Simulator 2.0 on your computer.  The setup package creates some dependency files that the beta versions will need.  So if you're downloading the beta onto a different computer than 2.0, that might be your problem.

2.  You must download the beta executable.  You can put it in your Gravity Simulator directory, or you can create a new directory for it. Wherever you put it, there must be a resume.gsim in that directory.  Codeoptomizer.dll is optional.

3.  If resume.gsim is corrupt, it will crash the program as you describe.  Just to make sure, delete resume.gsim, copy any of the existing gsim files into the same directory as your beta.exe , and rename it resume.gsim

4. If codeoptomizer.dll is causing your problem, you can find out by hiding the file.  Either remove it from your directory, or rename it so Gravity Simulator can't find it.  Codeoptomizer.dll duplicates some of the code in the VB version of Gravity Simulator, but codeoptomizer is written in C++, so it compiles into faster code.  If the file is missing, Gravity Simulator will execute a slower VB version of the same code.

5.  What country are you in?  Some people using European versions had some problems with version 2.0.  The betas seem to have fixed these problems.  The symptom was that Gravity Simulator ran just fine the first time around, but the resume.gsim created by European Windows was corrupt because it uses commas instead of decimal points.

Let me know if any of this helps!

Title: Re: Welcome (Terms of Use)
Post by coveysd on 07/23/11 at 17:07:16

1) Yes, I first installed GS 2.0 on the same computer, and ran it against the Apophis simulation.

2) Two of the betas I downloaded into the Gravity Simulator directory. Neither worked at all (they just go compute bound).
I downloaded the third beta, codeoptimizer.dll, and a different resume.gsim into a subdirectory. It failed the same way.

3) I copied A2004MN4.gsim into the gravity simulator directory, renamed it to resume.gsim, and tried the 2011FEB01 beta, which failed as before. Then I tried the original 2.0, and it worked perfectly. Note that when I did the copy and rename, Windows required me to provide admin privileges. I figured that's not a problem, because the regular 2.0 worked fine.

4) I renamed codeoptomizer.dll, it still failed the same way. I noticed that it is using 13% cpu, not 100%. But I'm running a quad core processor, with dual threads on each, so maybe that is 100% on the one thread of the one core.

5) I'm USA (St. Augustine, Florida)

I had thought the problem might be related to running a 64-bit Windows 7.

I just tried the 22APR2007 beta (in its own directory), and it worked correctly with the resume.gsim provided in the directions. I exited and tried it again, and it failed (it becomes non-responsive, doesn't even title the time window). I then renamed the A2004MN4.gsim as resume.gsim, ran the original GravitySimulator.exe in this directory, and it is MUCH faster with this version of codeoptomizer.dll. I created another virgin copy of resume.gsim (from A2004MN4) and tried the beta again - it immediately went non-responsive.

Any other ideas? Anything I can do to help isolate the problem?

Title: Re: Welcome (Terms of Use)
Post by Tony on 07/23/11 at 17:57:41

At the moment, I'm stumped.  If 2.0 runs on your computer, then the betas should too.

I could try making a setup.exe for the beta version.  Perhaps installing it on your computer rather than simply downloading an executable will solve the problem.  But this will have to wait, as I'm out of town for a week.

You'll probably like the next beta version if you're working with asteroids and how their orbits are modified.  It has dynamic time step, so you can let the sim run at fast time steps, and the sim slows down for you when an asteroid passes close enough to a planet to compromise accuracy.

Version 2.0 is still very capable.  In the meantime you could work with it until I figure out a fix for you.   Thanks for the bug reports!

Title: Re: Welcome (Terms of Use)
Post by EDG on 07/24/11 at 11:07:02


coveysd wrote:
I had thought the problem might be related to running a 64-bit Windows 7.


I'm running it on 64-bit W7 too and it works fine for me...

Title: Re: Welcome (Terms of Use)
Post by coveysd on 08/02/11 at 10:12:32

Tony et. al,

I'd like some advice. My primary interest is modelling asteroid deflection.

My first target is Apophis, and I've been playing with the A2004MN4.gsim model, and I decided to update it with the latest data from Horizons to see if the expected tiny differences in updated data made a difference in the April 13, 2029 close encounter.

I queried Horizons for Sun-centered coordinates for Apophis, the Earth, and Moon on 08-MAR-2028 and carefully entered the new data (and new start time) into a copy of the model. I also made appropriate changes for "geosynchronous".

Unfortunately, even with a step size of 1 second, this model shows Apophis missing the Earth by about 200,000 km on 14-APR-2029 (and on the wrong side).

I've triple-checked my numbers and dates.

What did I do wrong, or what should I do differently? Barycenter coordinates? Do I need to add in Jupiter, Venus, and/or Mars to get it right with the longer simulation?

Title: Re: Welcome (Terms of Use)
Post by Tony on 08/02/11 at 11:14:19

Can you post your .gsim file?
It sounds like you did everything correctly.  At a time step of 1 second you should have good results.  I just tried what you described, and even at time step 256 my results were much better than 200,000 km.  Here's my sim:
http://orbitsimulator.com/gravity/simulations/Apophis2028March8.gsim

Are you still having trouble with the beta versions?  I'm back home and can help you with that now.

Title: Re: Welcome (Terms of Use)
Post by coveysd on 08/03/11 at 07:57:43

Tony,

I don't see a difference between your numbers and mine! (At least for the Sun, Earth, and Apophis)

But I still see the difference in the results.

I've attached my gsim file. It has the same objects as your A2004MN4.gsim, plus (1) I added a duplicate to Apophis called "New", which I then apply a series of thrusts to, and (2) I added Jupiter to see if that would help (it made no difference). It worked much as I thought, bringing Apophis close to the Moon in April of 2030. Then I tried to apply the latest numbers, and it doesn't work.

Note my simulation does turn on graphics and changes the focus and scale a couple of times. I generally start it, turn off graphics, and let it run until they turn back on by themselves around April 12, 2029, in time for the close approach. Incidentally, I'm mostly applying thrusts of the order of a few cm/s per month (things we can do with ion thrusters).

It's probably something simple and stupid I did, and can't see!

Also, I don't see where you get your numbers for the 2004MN4 January object, so it is simply wrong. At one point I just ran your model backward until 08-MAR-2028 and used those numbers, but somewhere I screwed that up.

And I still don't have the beta working. I was hoping a real "beta install" might help, although I don't see why!

Best regards,
Steve Covey
http://RamblingsOnTheFutureOfHumanity.com/

Title: Re: Welcome (Terms of Use)
Post by EDG on 10/24/11 at 01:12:05

Tony, it would seem that your antispam measures have been failing recently... are there any anti-spam mods for YABB?

Title: Re: Welcome (Terms of Use)
Post by Tony on 10/24/11 at 17:41:03

I may switch to the new version soon.  I don't know if its any better.  I might disable registration.  Anyone wanting to register can send me an email

Title: Re: Welcome (Terms of Use)
Post by EDG on 10/25/11 at 01:59:53

I'd really recommend switching to phpbb3 to be honest - it's much better. I'm not sure if you could port over the posts from here, but you could keep this as an archived forum and start afresh on a new phpbb3 one maybe?

Title: Re: Welcome (Terms of Use)
Post by MissEuropa on 06/01/12 at 17:16:33

Hello!
Validation complete?
I'm a NMSU astrophysics major who is currently researching p type binaries and their potential for hosting terrestrial Earth like planets. I've been using gravity simulator for about two years now.
My current project is modeling a p type binary with at least one planet to demonstrate stability of orbit. I found interest in this topic after reading the Rare Earth Hypothesis's conclusion that a planet without a moon would be inhabitable for complex life. Though I do not necessarily agree with this conclusion I'm intrigued in finding other ways that tidal forces can be present on a planet without a large moon.
I look forward to learning what I can from the forum.

Miss Europa

Title: Re: Welcome (Terms of Use)
Post by Athena on 07/10/12 at 10:40:31

Hello everybody.  
This is an interesting simulation.  
I am here to learn what makes 7-5-3-s.gsim work and then fiddle and make some changes.

Title: Re: Welcome (Terms of Use)
Post by Basilisk on 09/06/12 at 19:58:07

Hey guys,

just introducing myself.
I am a screenwriter (actually I work in a team of screenwriters, you may call us legion, for we are many, lol), and we are working on a project writing the script for a TV series pilot that we should have up to delivery by this coming December.
I guess you folks are just the ideal crowd to help me with some questions I have. I've been trying to crunch Gravity Sim by myself, but I don't seem to get the handle of it.

I will post my question this weekend.

Thanks for having me in.


Title: Re: Welcome (Terms of Use)
Post by Tony on 09/10/12 at 15:16:36

Welcome!  We look forward to your questions.

Title: Re: Welcome (Terms of Use)
Post by inetd on 12/03/12 at 21:14:37

Hi, guys!!

Glad to be here, and thank you for this!!
Short introduction: I am working in IT inducstry, computer networking. But very interesting in astrophysics, astronomy. And I am very happy to find this great Gravity Simulator - at least I do not need to write my own :) (some ideas was present during last 5 years, but no time)

Thanks!!

CU,
Denys

Title: Re: Welcome (Terms of Use)
Post by JDoolin on 12/29/12 at 17:20:10

Hello.

Jonathan Doolin here.  Long time Special Relativity enthusiast.  Second-time astronomy professor.  Learning as much as I can so I can teach it!  

While looking up some things about the plutoids I happened across this animation:   http://en.wikipedia.org/wiki/File:OrcusandPlutoRotatingFrame.gif   After a little more googling, I think I found the software that made it!  


Title: Re: Welcome (Terms of Use)
Post by EDG on 12/30/12 at 00:54:47

Welcome aboard! It's been pretty quiet around here for a while, but don't be afraid to ask questions - I think the hardcore regulars are still around to answer them, they're just lurking :). The more you ask, the more likely we'll come out to help and get some discussions moving again :).

And also, do browse through the existing threads - there's a lot of fun experiments that you can do if you have the inclination (no pun indended!). I've had some fun exploring kirkwood gaps - see for example:
Kirkwood gaps part 1: http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1222072355/0
Kirkwood gaps part 2: http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1223246512/0
Inner and Outer Reaches: http://www.orbitsimulator.com/cgi-bin/yabb/YaBB.pl?num=1226290391/0


Title: Re: Welcome (Terms of Use)
Post by astroadrian99 on 10/26/13 at 15:44:39

Yes I agree to the user agreement. Wohoo I'm in the forum. :D

Title: Re: Welcome (Terms of Use)
Post by flap on 11/13/13 at 23:01:17

Hello !

I am a newcomer to the forum. And we will see how much I can participate...

The first time I fell in love with gravity simulations (games, I should say) was with that small java game (http://www.zeniko.ch/static/gravity.html) around 2004 . Since then I have tried playing orbiter, used Kerbal Space program quite a bit, and also toyed with GMAT (http://gmat.gsfc.nasa.gov/) from NASA (an interesting solver).
I had also built a basic simulator implementing solar winds, and displaying plenty of funny things, such as gravity fields, wind field, sphere of influence...

But I was looking for a simple application, light enough to be used on my netbook, and that would allow me to fly a space craft without having to wait ages for the sim to propagate. And Gravity Simulator might do the trick.

So, hello everybody ! And let's investigate that piece of software.

Title: Re: Welcome (Terms of Use)
Post by geoff on 12/10/13 at 08:57:28

Hello,

Happy to be on this forum.  Huge thanks to Tony for creating the simulator.  I have just finished my Masters of Architecture, but am also fascinated by world-lines and cosmology and so look forward to exploring this forum as well as the simulator!

Best,
Geoff

Title: Re: Welcome (Terms of Use)
Post by stargate38 on 12/19/13 at 13:17:16

Hi! I love your gravsim and I've used it for many scenarios (such as moon formation). :)

Title: Re: Welcome (Terms of Use)
Post by Tony on 12/20/13 at 09:47:29


stargate38 wrote:
Hi! I love your gravsim and I've used it for many scenarios (such as moon formation). :)

Welcome.  Please share some of your sims!

Title: Re: Welcome (Terms of Use)
Post by DD2014 on 01/26/14 at 13:05:23

Posting for validation  :)

Title: Re: Welcome (Terms of Use)
Post by ScottM on 03/09/14 at 11:00:06

Hi, everyone. I'm Scott from Mississippi. I've been an astronomy buff all of my life -- the Solar System in particular. I like playing around with the simulator to learn more about the interactions of the bodies in the Solar System.

Title: Re: Welcome (Terms of Use)
Post by Tony on 03/12/14 at 18:14:50

Welcome Scott!

Title: Re: Welcome (Terms of Use)
Post by DirkVV on 08/19/14 at 21:49:32

Hello everybody,

I like the gravsim and like "playing" with it! There will be a lot of questions, i am sure. I hope this forum can help me.

Dirk

Title: Re: Welcome (Terms of Use)
Post by thalamus on 12/11/14 at 21:19:14

Hello! I love gravity simulations, but I'm too poor of a programmer to make my own...

Title: Re: Welcome (Terms of Use)
Post by jgfusco3 on 03/04/15 at 19:58:14

Hi

Title: Re: Welcome (Terms of Use)
Post by RGClark on 08/07/15 at 05:48:08

Hello. New member here. My background is in pure math, but I've always been interested in astronomy.
One of my research focuses now is methods of achieving low cost space access and low cost spaceflight beyond low Earth orbit.

 Bob Clark

Title: Re: Welcome (Terms of Use)
Post by wsaylor72 on 01/17/17 at 13:58:35

New member here with career in aerospace and energy. Have primarily worked on geocentric orbital mechanics for numerous satellite and rocket programs with some small work on interplanetary trajectories. Always wanted to pursue more general astrodynamics work and this looks to be a great tool and great group of members. Still working a few programs but more interested in developing educational activities.

Bill Saylor
Bennett, CO


Title: Re: Welcome (Terms of Use)
Post by jwbrase on 08/31/17 at 20:17:28

Posing for account validation.

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