How did Galileo's observations with his telescope provide further evidence for the heliocentric model and a simpler explanation of retrograde motion?
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Jan 25, 2022 ... In terms of astronomy (again, not astrology), retrograde motion is when the motion of a body (planet, moon, asteroid, etc.) is in the opposite ... Retrograde motion of the outer planets starts and ends near the time of opposition, when a planet is opposite from the Sun in the sky. Short animation depicting the retrograde motion of planets in the night sky. Embed code