What year did man discover that the earth has an elptical orbit?

Question

What year did man discover that the earth has an elptical orbit?

Answer 1

The Sumerians depicted the earths movement around the sun. Somewhere around 5300 BC.  

Answer 2

Kepler published his 1st and 2nd laws in 1609.

It is his 1st law that says that orbits are elliptical.

This is one of the reasons that next year is the international year of astronomy: http://www.astronomy2009.org/

It's also the year Galileo started using a telescope to do astronomy

Answer 3

it was galelio

you can search abt his discoveries on www.wikipedia.org

Answer 4

In 1605, Johannes Kepler (using observations made by Tycho Brahe) deduced that the orbit of Mars must be an ellipse and made the logical leap that all planets must orbit in ellispes, with the sun at one focus.

Answer 5

1605