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Solar position and velocity vectors - Use?

  1. Nov 27, 2011 #1
    Solar position and velocity vectors -- Use?

    What are the solar position and velocity vectors used for? A program I'm working with requires them to help construct the trajectory of a meteor. Do they somehow become useful in calculating the orbit of the meteor?

    Aside from their use, I'm looking at an old astronomy almanac for 1991, and found them in a table. I would like to know them for CE 1955 October 20 07:53:32.6 UT for three dates either side of that date. The USNO probably has them on a web site, but a msg I sent to them early last week has gone unanswered so far.
  2. jcsd
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