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    Star sights on reciprocal bearings
    From: Geoffrey Kolbe
    Date: 2006 Dec 11, 06:10 +0000

    Paul Hirose [Navlist 1862] wrote
    
    >How would these paired observations reduce the effect of leveling error?
    >It seems to me that if the theodolite vertical axis is inclined say 1
    >minute to the north, then a star to the north will measure 1' too high
    >
    >and a star to the south will measure 1' too low. The leveling error has
    >
    >not been eliminated: both observations agree that you're 1' north of the
    >
    >true location.
    
    Yes, having launched my epistle on the NavList sea, I re-read it and
    asked myself the same question....
    
    Paul is quite right, levelling errors on a theodolite are taken care
    of in other ways.
    
    Thankyou Paul,
    
    Geoffrey Kolbe
    
    
    
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