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Earth revolves in eliptical path?

by wasi-uz-zaman
Tags: earth, eliptical, path, revolves
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wasi-uz-zaman
#1
Dec30-12, 07:04 AM
P: 40
hi , how earlier scientist figure out that earth has elliptical motion rather than circular around sun?
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mfb
#2
Dec30-12, 08:05 AM
Mentor
P: 11,589
You can track the relative position of earth and sun relative to stars - the orbital speed depends on our distance to the sun, if that changes the orbit has to be a (true) ellipse.
You can use observations of other planets as well, but that is tricky as those move significantly within a year.
Dr_Morbius
#3
Dec31-12, 05:22 PM
P: 155
http://en.wikipedia.org/wiki/Kepler%...anetary_motion


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