Planetary Orbit help

From: bgordon555 (bgordon555_at_gmail.com)
Date: 02/27/05 

Date: 26 Feb 2005 22:02:27 -0800

Hi all,

This group was extremely helpful to me a little while ago and I'm
hoping you can help me out again!

I'm trying to be able to determine the coordinates of a body, say the
Earth in the orbital ecliptic of another body, say Mars.

Jean Meeus, is magnificent in providing a formula for the declination
(D sub E) but not for the Right Ascension. He gives:

sin(D sub E) = -sin(lat North Pole Mars)*sin(lat geocentric Mars) -
cos(lat North Pole Mars)*cos(lat geo Mars)*cos(long NP Mars - long geo
Mars)

How do you calculate the Right Ascension of Earth from Mars measured in
Mars' orbital plane? And, how would you then transform that into
longitude?

My deep thanks to anyone who can help me with this problem!

Best,
Bill

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