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    Re: Calculators "old technology"
    From: David Iwancio
    Date: 2020 May 1, 12:40 -0700

    My wild guess is "B" is "fraction of a Besselian year," since he seems to be the usual culprit when the letter "B" pops up.  "C" might be something like "centuries since B1950.0" or from some other zero point.

    I'm very much not an expert, though.

       
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