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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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