Solving Kepler Problem for 2-Body System: Velocity & Position

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Philosophaie
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How do you solve the Kepler Problem for a 2-body system where m1<<m2 with a given velocity and position vector resulting in a new velocity and position for a certain time interval?
 
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Is there anywhere on the web that it is solved?
 
I think it is also in Chapter 5 or 6 in Fowles and Cassiday.
 
There are many ways of solving Kepler's equation - hundreds of them. Any decent celestial mechanics text should present several. Have you searched around on the web?
In general, if you're going to do much celestial computing, I recommend the works of Jean Meeus.