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    Re: Lunar Distance Puzzle
    From: Dave Walden
    Date: 2011 Aug 21, 10:43 -0700

    using your values, I get:
    vega- altair
    -22° 47' 36.1350"
    +18° 32' 40.1201"

    vega-antares
    -22° 47' 36.1317"
    +18° 32' 40.1067"

    altair-antares
    -22° 47' 35.9896"
    +18° 32' 40.1042"

    From Xephem, for which I make no claims, only that it seemed to work, I got:

    antares
    16 30 9.43
    -26 27 28.7

    altair
    19 51 23.14
    8 54 5.4

    vega
    18 37 22.25
    38 47 49.3

    I hope I've made no typos. I'll check my other program tomorrow.

    **************************************************
    Dave,

    When I compute the distances from the app. Moon position that you are
    giving below to the three stars in question, I obtain results that
    differ by up to 8" from the distances that you posted on 8/16 in your
    "refraction-free" problem. Unless I am making a bad mistake in my
    calculation, my star ephemeris must differ substantially from yours. I
    find both alternatives equally disturbing. Would you please post the
    positions of the three stars (whether geocentric or topocentric for the
    solution - it does not matter.)

    I obtained from MICA:

    Altair 19 51 23.125 + 8 54 05.51
    Antares 16 30 09.432 - 26 27 28.66
    Vega 18 37 22.186 + 38 47 49.42

    Thanks,

    Herbert
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