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doit_the_clown doit_the_clown
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7 years ago
An apparent WESTWARD motion of a planet from night to night compared to the background stars (as viewed from the Earth) is referred to as
A)   retrograde motion.
B)   precession.
C)   rising (if in the east) or setting (if in the west).
D)   direct motion.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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7 years ago
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7 years ago
Smart ... Thanks!
yen
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Yesterday
this is exactly what I needed
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2 hours ago
Thanks
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