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    Re: Celestial Navigation without a sextant.
    From: Marcel Tschudin
    Date: 2008 Mar 16, 13:24 +0200

    In an other mail I wrote:
    "The angle between a vertical line and the trajectory line of the
    setting sun corresponds quite well to the latitude of the observer. At
    the equator the sun sets along the vertical line and at the poles the
    sun turns along an almost horizontal line. At a given latitude the
    time difference between lower and the upper limbs touch the horizon is
    fairly constant."
    
    In order to see how constant this is, one could verify it with a
    program which can calculate the sun's positions for different
    locations and days within a year.
    
    I'm wondering whether this couldn't be used in navigation WITH a
    sextant to determine the latitude. How much would the error be if one
    would try to determine the latitude by measuring e.g. the time
    interval between the sun's upper limb touching 3 and 1 degrees above
    the apparent horizon?
    
    Marcel
    ( Probably the only member in this list having not yet hold a sextant
    in his hands.)
    
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