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What does it mean for Mercury to be in retrograde?
starchild.gsfc.nasa.gov/Images/StarChild/questions/cop_retro.gif
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Date saved:
2008/10/22
20:10:56
Automatically generated tags:
diagram
100
science
71
earth
47
illustration
44
stars
40
astronomy
22
sun
20
orbit
20
mars
3
parallax
1
