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11/19/17 at 13:48:00
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The Reference Angle? (Read 2020 times)
Michael_C._Emmert
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The Reference Angle?
11/06/05 at 09:13:46
 
Hi, all  Smiley;
 
Where is the First Point of Aries on GravitySimulator?  I need to have reference angles to program in the correct values in Longitude of the ascending node, argument of perifocus, and mean anomaly.  And if you are in rotating frame reference, of course, your reference angle changes constantly.  It makes it difficult to add objects in the middle of a simulation.
 
I have been making do with creating objects and refering to those.  undecided  This ad hoc solution works for what I am trying to do (fill Lagrange stability zones with groups of objects) but it just won't do for somebody who, for instance, is aiming spaceships.
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Tony
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Re: The Reference Angle?
Reply #1 - 11/06/05 at 12:32:06
 
The First Point of Aries, a.k.a The Vernal Equinox is the 9 o'clock position on your screen in a non-rotating frame.  A mean anomoly of 0 should place you there, but make sure that you change the 100% to 0% in the +/- boxes for mean anomoly, perifocus, and ascending nodes.  Otherwise, it will pick a random value for you.
 
The rotating frame doesn't change the angle for the purpose of creating new objects.  It just constantly changes the viewing angle.
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