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Feb15-12, 12:06 PM
P: 1
I must solving a Kepler's problem (for elliptical orbit, for Earth) with Runge-Kutta 4th methods in MATLAB, but I don't know what is my differential equation and how I can solving it, what I must put it in differential equation for initial value.

For examples when I change a steps I must get where will be a Earth on his orbit.

And for last value I must get the correct value for period of Earth, 365.24 days, and position of Earth return in started position.