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    Re: Tinyac on Linux
    From: Peter Monta
    Date: 2017 Apr 3, 15:08 -0700
    Hi Bruce,

    Or can someone recommend another program that provides apparent positions with sub-arcsecond accuracy, taking account of all the usual factors like height, temperature, pressure?


    The planetarium programs may not be taking into account up-to-date estimates of UT1 and polar motion.  Some reference implementations for astrometry are the packages NOVAS and SOFA and, more recently, Skyfield.  Skyfield has a convenient and concise Python API and automatically queries IERS for the earth rotation parameters---I've used it for some theodolite astro reductions (I too have been bitten by this bug).

    Sub-arcsecond accuracy in the vertical angle will depend on accurate knowledge of the troposphere all along the line of sight.  I'm not sure it's realistic to do much better than a few arcseconds for moderately large zenith angles.

    Cheers,
    Peter

       
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