8A30.32 - Retrograde Motion
- Christopher Sirola, "Apparent Retrograde Motions of Planets", TPT, Vol. 60, #2, Feb. 2022, p. 150.
- Bruce G. Thompson , "Using Retrograde Motion to Understand and Determine Orbital Parameters", AJP, Vol. 73, # 11, p. 1023, Sept. 2005.
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