3 Planets converging on Leo Constellation

[Philosophaie]

Venus, Mars and Saturn are converging on the Constellation Leo at the end of the month. I would like to find the Right Ascension and Declination of these planets given the obliquity, the true anomaly, the radius from the sun and the inclination.

 

[phyzguy]

RA and Dec of any of the planets for a chose time period are available at the JPL website at the link below:

http://ssd.jpl.nasa.gov/horizons.cgi

 

[Philosophaie]

I would like to calculate RA and DEC for dates into the future using the data from:

http://ssd.jpl.nasa.gov/txt/p_elem_t2.txt

 

[phyzguy]

This is not a simple problem, since you not only need to calculate the position of the planets relative to the sun, but also calculate the position of the Earth, then convert everything into geocentric coordinates, correct for the equation of time, etc. However, here is a good website showing how to do it:

http://www.stargazing.net/kepler/ellipse.html