October 7, 2015

Homework Help: Astronomy

Posted by B on Sunday, March 28, 2010 at 6:34pm.

Retrograde motion describe the
A backward motion of the stars relative to Earth
B uniform circular motion exhibited by the planets
C irregular speeds at which the planet travel.
D backward motion of the planets with respect to the stars

I think the answer is A
But my book state that it in a backward motion but I don't understand

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