🚀 go-pugleaf

I'm trying to simulate the motions of the planets and was wondering if
there were an easy way to determine the angular position and velocity of
a planet relative to the sun.

I'm assuming at time 0 the planet is at position 0 degrees, which I'm
arbitrarily assuming is perihelion.  It's easy enough when the orbits
are assumed to be circular, but I'd like to throw in eccentricity of orbit.

Also, I assume that not all planets reach perihelion along a line.  I'd
like to know where each planet reaches perihelion (preferably in degrees
relative to earth's perihelion).

Most sources I've checked give average distance from the sun, eccentricity
of orbit, and inclination of orbit to ecliptic, but I don't think these alone
will give me what I need.

I'd appreciate any help, either directly or by recommending a good text.
My email address is included below.

Thanks in advance.
					
---- D. Scott McCrickard (mccricks@cc.gatech.edu)