Is there a resource showing relative distances between the planets charted for different times of the year? Specifically, I'm looking for tables or software where I can type in a date, and a starting location, say Mars, and see the distance to a selected body in the solar system, say Jupiter. For example: I can select my starting location to be Venus, my date to be March 10, 2005 and my destination to be Saturn. Then it will give me the distance between the two. Thank you.