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    Re: Longitude by lunar and solar transit
    From: Peter Monta
    Date: 2014 Jun 3, 17:11 -0700
    Hi Geoffrey,
     
    Doesn't that mean that the expected accuracy in longitude is +/- 15 degrees...?

    :-)  Yes, one needs to know where the meridian is (on the theodolite horizontal scale) to high accuracy, but observations can still be off-meridian.  This 15-degrees thing is apparently for second-order effects like changes in the lunar diameter over the course of an hour or two.

    Cheers,
    Peter

       
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