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    Re: Time of meridian passage accuracy
    From: John Huth
    Date: 2009 Sep 26, 19:02 -0400
    Doug, George -

    Thanks for the enlightening back-and-forth.   I hadn't thought about this effect, but I do see the point that meridian passage does not coincide precisely with the maximum altitude. 

    The original poster quoted Bowditch:
    use the time listed under the “Mer. Pass.” column to estimate LAN unless extraordinary

    accuracy is required.


    My reading of Bowditch is that they're concerned about classic sextant/chronometer work, so the 0.8 arc-minute difference seems to be consistent with this, although I imagine one can strive for the best accuracy by making a small correction.   0.8 begins to sound like extraordinary accuracy, given my personal skills with a sextant.  

    John H.

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