Why does earth follow an elliptical orbit? Why not a circular orbit?

Earth's orbit is almost a perfect circle; its eccentricity is only 0.0167

It is explained by PROF. H.K. SAHU ofChennai Mathematical Institute through The Hindu.

http://www.thehindu.com/sci-tech/article2366177.ece

you can also like to read these:

http://en.wikipedia.org/wiki/Milankovitch_cycles

http://en.wikipedia.org/wiki/Orbit

http://www.windows2universe.org/physical_science/physics/mechanics/orbit/ellipse.html

here are some more interesting stuff

http://www.analemma.com/Pages/EllipticalOrbit/EllipticalOrbitEffect/../../../Graphics/eccentricity/CvE_Part1.mov

http://www.analemma.com/Pages/EllipticalOrbit/EllipticalOrbitEffect/EllipticalOrbitEffect.html

Earth's orbit is almost a perfect circle; its eccentricity is only 0.0167

It is explained by PROF. H.K. SAHU ofChennai Mathematical Institute through The Hindu.

http://www.thehindu.com/sci-tech/article2366177.ece

you can also like to read these:

http://en.wikipedia.org/wiki/Milankovitch_cycles

http://en.wikipedia.org/wiki/Orbit

http://www.windows2universe.org/physical_science/physics/mechanics/orbit/ellipse.html

here are some more interesting stuff

http://www.analemma.com/Pages/EllipticalOrbit/EllipticalOrbitEffect/../../../Graphics/eccentricity/CvE_Part1.mov

http://www.analemma.com/Pages/EllipticalOrbit/EllipticalOrbitEffect/EllipticalOrbitEffect.html