Does anyone know how to generate motion based on a
mathematical formula? I am trying to animate a small comet around
the sun. It is an elliptical orbit based on the formula, x^2/a^2 +
y^2/b^2 = 1.
As the comet approaches the sun, it accelerates and then, as
it moves away from the sun, it decelerates. Also, its shape, namely
the coment tail, will allways stream away from the sun (coment's