The sun is at the origin of the rectangular Cartesian frame of reference.
The planet can be moved anywhere and given vertical and horizontal speed
components.
Calculates planetary motion by an iterative procedure The initial
values are those Richard Feynman used during a lecture in which all the calculations
were done by hand. (See Feynman's Lectures in Physics, Volume I, Chapter
9-7)
To demonstrate the changing speed in an elliptical orbit (say) use initial
horizontal coord = 0.4; initial vertical speed = 2; number of increments
= 145; retain all other values.
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