Questions tagged [retrograde-orbit]

Questions regarding the movement of a celestial body that is in the opposite direction of another celestial body the original one is orbiting.

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what is the resolution of the magnitude that is distinguishable to the naked eye?

Or is it possible to spot the changing brightness (magnitude) of a planet with a naked eye The context of the question is this: If I'm not mistaken Ptolemy was able to say (using observation alone) ...
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Do astronomers have any idea what percentage of our galaxy’s stars move in retrograde orbits?

I recently noticed that none of the planets in our solar system orbit the Sun in a retrograde direction. This is likely because they formed moving in the same direction as the planetary disk did in ...