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    Curve sketching freeware
    From: David Pike
    Date: 2017 May 14, 08:11 -0700

    I made 24 (non-averaged) Hs of the Sun either side of meridian passage this lunchtime with an assistant recording Hs and time, primarily to see over how long a period a mer-pass latitude might be possible with an aircraft sextant.  Then I started to play with the observations to see if an attempt at a longitude might also be possible, but my observations were so ‘noisy’ compared to the expected flat Hs curve that it barely made any sense.  Is there a piece of freeware which would take a series of Height Sextants at irregular times either side of meridian passage, plot the best curve, and come up with the time of maximum Hs?  I appreciate that one would have to treat such a seemingly precise result with great caution.  DaveP

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