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    Re: JPL ephemeresis and Nautical Almanac - speed of light question
    From: Paul Hughes
    Date: 2018 Apr 4, 02:34 -0700

    We define time as the length of the year 1900, and its resultant second. Using Sun as your origin requires your translation of that defined Earth based time to one of your origin's. See Seidelmann's Explanatory Supplement to the Astronomical Almanac.

       
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