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    Re: Sun Polynomials again
    From: Bill Murdoch
    Date: 2002 Oct 30, 22:05 EST
    In a message dated 10/30/02 12:41:14 AM Eastern Standard Time, gtalge@PE.NET writes:

    There is also a statement that "Corrections have been incorporated
    in the data for Venus and Mars to allow for their phase, so that the
    position obtained from the polynomial coefficients...is for the
    observed centre-of-light." Not sure what this correction is and
    how to apply it yet for the planets.

    NAO Technical Note Number 55, The Phase Correction for Venus, by B D Yallop describes the correction.  The summary reads:

    The basis of the additional corrections for Venus, which allow for parallax and phase, on page A2 of the Nautical Almanac from 1952 to 1984 is described.  For Nautical Almanac 1985 onwards the GHA and Declination of Venus in the main tables will be given for the centre of light so that no phase corrections is required.  The method of correcting the GHA and Declination of Venus from the centre of disk to centre of light is described.

    1981 May

    H M Nautical Almanac Office
    Royal Greenwich Observatory
    Herstmonceux Castle
    Hailsham East Sussex  BN27 1RP

    Bill Murdoch
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