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    Re: Testing sextant arc error
    From: Francis Upchurch
    Date: 2017 Jan 17, 22:26 -0800

    Hi David,

    In the past I have used the table in Letcher page 83 which includes true distances between 45 pairs of stars.

    However,it is epoch 1977 and I'm not sure how much it would need to be corrected for "proper motion" etc.for recent times.

    Letcher says he chose stars for the table with small proper motions all under 0.2" per year, so max error 8" today ? You could try a couple and then check those against present NA numbers as you suggest.

    It worked well when I tried it on my then new Astra 111b in 2004. Time flies! (Oh to be travelling near the speed of light!)

    Best wishes

    Francis

       
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