Re: TLE Information, Please

From: Ralph McConahy (
Date: Sat Feb 07 2009 - 21:08:18 UTC

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    Adam asked: 
    >>Is there a certain time of day that the ISS TLE 
    >>becomes the "latest" and most "accurate"? 
    >>If the pass is at 18:14 EST, when should the latest
    >>TLE be sought? 
    The portion of your top most TLE in your post that reads "09037.82898148" is the epoch of the TLE.
    That says: Year = 2009, day of year = 37 (6-Feb), and 0.82898148 fractional day (translates to 19:53:44).
    The time it UTC, not your local time. 
    Generally, you want to use the TLE that has an epoch that is the closest to your observation time. 
    More can be found about TLEs here:
      Ralph McConahy
      38.3306N, 75.6970W, -25m (WGS84)
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