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**help deriving this elliptical orbit equation??**

Hi guys, this is my first post on these boards. just found out about this forum and im really happy because i often find i need a place like this to ask questions and my prayers are answered!

im a physics/computer science major in my second year at the University of the Witwatersrand in Johannesburg, South Africa.

any way.. enough history..

i need help deriving this equation for an elliptical orbit :

[tex]\frac{(x + ae)^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1[/tex]

where e is the eccentricity and for an ellipse e < 1

i cant find anything useful in my books and dont even know where to start.

any help would be awesome! thanks!

-skiz

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