
In orbital mechanics, Kepler`s equation relates various geometric properties of the orbit of a body subject to a central force. It was first derived by Johannes Kepler in 1609 in Chapter 60 of his Astronomia nova, and in book V of his Epitome of Copernican Astronomy (1621) Kepler proposed an iterative solution to the equation. The equation has pl....
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http://en.wikipedia.org/wiki/Kepler`s_equation

One of the important formulae that enables the position of a body in an elliptical orbit to calculated at any given time from its orbital elements. It relates the mean anomaly, M, of the body to its eccentric anomaly, E, by the following: M = E - e sin E where e is the eccentricity of the orbit...
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http://www.daviddarling.info/encyclopedia/K/Keplers_equation.html
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