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    Emergency Meridian Altitude
    From: David C
    Date: 2016 Dec 8, 23:18 -0800

    Just before LAN today I became lost and needed to perform a meridian altitude sight.  Such sights with an AH are not possible for me at this time of year so I had to improvise. I had with me some pegs, a tape measure, a level, a tablet containing the aeronautical almanac and a calculator. See the photo. With only a minimal effort to level the pegs I obtained the following result:

    2016/12/9

    130803   (approx)

    Zone -13

    Vertical 370 mm

    Horizontal 121 mm

    Angle  71° 53.5'

    Refraction 0  (from AP3270)

    Sun's altitude  71° 53.5'

    dec  22° 49.9'

     lat = 90  + dec  - alt

       = 40° 56.4'

    GPS lat S 41° 06.5'

    Error  10.1' which I am happy with considering the very rough way in which I levelled the pegs and measured the lengths.  Probably accurate enough to get me out of the Sahara?



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