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    Refraction
    From: Gary LaPook
    Date: 2007 Nov 20, 11:04 -0800

    Gary LaPook writes:
    
    Attached is an excerpt from Dutton, explaining refraction, and the
    sextant correction table from the 1999 Nautical Almanac to assist Mike
    Lenzie. The sun correction table includes refraction and semi diameter
    for upper and lower limb observations. The included dip table is for
    correction of height of eye above sea level and can be computed from the
    formula:  dip (in minutes of arc) = .97 times the squaare root of the
    height of eye (in feet.)
    
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