Copernicus and Retrograde Motion I

[heliocentricist]

Ah, i remember the epicycles. they used to make me chuckle! :D

[ml0090]

This Is Another Cool Space Video

[SoldierCyfix]

i still dont get it

[mrg3]

If you track the position of the planets amongst the constellations, the planets usually move eastward but occasionally do a temporary westward motion called retrograde motion. In the case of mars, this apparent "backwards" motion happens when earth passes mars as they both orbit the sun.

[SoldierCyfix]

thnx I understand fully I already got many answers from yahoo and other sources too. it is kinda confusing.