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	Solar System Project (Extra): Retrograde Motion of Mars (Selim Tezel's Project Based Learning Initiative in Mathematics) View
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	How can Planets be in Retrograde Geocentrism Explained (The Science Asylum) View
	Mars in 2014 (including its retrograde motion) (astrology21stc) View
	ASTR100-Retrograde Motion Project Part 2/4 (DJ Bouzidi) View
	Earth's motion around the Sun, not as simple as I thought (Aryan Navabi) View
	The Mysterious Orbit of Mercury I The Great Courses (The Great Courses) View
	Why A Day on Venus is Longer Than a Year! \| Fascinating Space Facts (FACTS!) View
	Geocentric and Heliocentric Models of Solar System (Greg Clements) View