Could a planet with a retrograde orbit still be habitable?
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Mar 11, 2025 ... Retrograde motion happens when a celestial body appears, from our vantage point on Earth, to move backwards in the sky. It's an optical ... Feb 9, 2016 ... Ptolemy modeled the planets making small circles around a point that orbited the Earth. These smaller circles were called epicycles, and they allowed the ... Short animation depicting the retrograde motion of planets in the night sky. Embed code