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    Re: Celestial Navigation In The Gps Age: Typos?
    From: Greg Rudzinski
    Date: 2017 Aug 31, 11:55 -0700

    Tony,

    You ask:

    "Also I wonder why the Chapter 10, Accuracy advises to use the different corrections for the lower and upper limbs of the Sun (the -13.5' and +18.5' respectively). Yes, their sum is the very familiar 32' of the Sun's diameter, but why they are different?"

    The limb correction has been summed with refraction which gives different values for upper and lower limb since refraction is always negative. The Nautical Almanac also sums limb and refraction into a single correction.

    Greg Rudzinski

       
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