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North Star, South Star (Read 1640 times)
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North Star, South Star
04/17/16 at 13:52:41
Polaris won't always be the North Star.  Year by year, it is currently getting closer to the North Celestial Pole.  So for our lifetimes and the lifetimes of our children, Polaris will be the North Star.  But things start to change for our great-great grandchildren.  Over a 26,000 year period, Thuban and Vegas will assume the role as the North Star before Polaris resumes its role.  Next time around, Polaris won't be quite as close to the pole as it is now due to proper motion.  26,000 years ago, Polaris was even closer to the pole than it is now.
The Southern Celestial Pole currently has no resident bright star.  That too will change.  Sirius, the sky's brightest star (besides the Sun), is drifting South and will take a few turns serving as the South Star.
North Celestial Pole: https://www.youtube.com/watch?v=1afWTdygOF4
South Celestial Pole: https://www.youtube.com/watch?v=WxIFqhP0IMw
Movies made using http://orbitsimulator.com/gravitySimulatorCloud/properMotionHome.html
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