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    Key West near-LAN sights
    From: Peter Hakel
    Date: 2013 May 17, 17:13 -0700
    Today (May 17, 2013) I took six Sun LL observations from a beach on the south shore of Key West, Florida.  It looks like I just missed the LAN, so the resulting noon curve extrapolates a little, which is always a concern.  The index error on my Davis Mark 15 was initially 5' off the arc; I remeasured it after sights #3 and #5, when it came up 3' off the arc.

    Conditions: partly cloudy, nice horizon.
    T = 26 C
    HE = 7 ft
    P = 1016 mb

    Considering all this, I'd say the results are not too bad:
    Lat: N 24° 38'    ("exact" Lat: N 24° 33')
    Lon: W 83° 16'   ("exact" Lon: W 81° 46')

    For additional details, see attachments.  I never read such high altitudes (over 84 degrees) but it did not seem to be difficult.  The instability of the index error was kind of expected based on what I have seen before with my sextant.  I suspect missing the moment of LAN is the main source of error here, since I didn't get a nice "symmetric" data set around LAN this time.

    It got cloudy in the afternoon and evening; so I had to abandon my plans for a Sun-Moon fix, Sun lunar, and a LAM (Moon transit, a.k.a. "local apparent Moon" using this list's lingo :-)  ).


    Peter Hakel

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