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I've written a program which simulates the motions of planets and other bodies. I'd like to run it on our own solar system, but to do so I need to know the current positions (preferably in heliocentric coordinates) of the planets as well as their current velocities. Is there a website where I can find this?

I've found all the positions of the planets here, and I can find their average orbital speed fairly easily, but for some planets (e.g. Mercury) the orbital speed varies a fair amount.

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up vote 3 down vote accepted

I take it this still works: http://www.physicsforums.com/showthread.php?t=114165.

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The link to the blog post in your previous edit worked perfectly! (Shockingly!) If you revert I'll be happy to accept. –  Alex Becker Jan 14 '13 at 21:19

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