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    Re: Calibrating a Bris sextant
    From: Marty Lyons
    Date: 2017 Aug 13, 19:40 -0700

    Right now I am just trying to get the calculations under my belt as I am in Princeton, NJ, 25 miles from the coast and a real horizon . So I use a hand level to sight a ficticious horizon and bring the sun in the Bris down or up to it. Not very accurate but it's helps me get working on the principles which I can refine later at the coast.  I have been using the USNO calculators. 

    Here are a few data points if you don't mind coming up some angles for me. 

    6th "sun"  , 11 Aug 2017,  Upper Limb, UTC 19:49:57   DR for all N 40 22.545', W 74 40.095'

    6th "sun"  , 11 Aug 2017,  Center, UTC 19:48:41         my derived angle 46 10.0'

    9th "sun" , 13 Aug 2017,  Upper Limb,  UTC 15:19:09

    9th"sun",   13 Aug 2017, Center, UTC 15:21:44            my derived angle 55 53.8'

       
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