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Subject: [Nml] Dip
From: Millard Kirk (mkirk@XXX.XXX)
Date: Thu Dec 10 1998 - 00:27:29 EST
I have always wanted to know the relationship between these two formulas,
or are they related.
Distance to visible horizon in nautical miles:
D = 1.17 times the square root of the Height,
and
Dip of the visible horizon in minutes of arc:
D = 0.97 times the square root of the Height.
One factor gives distance and the other gives degrees. It has been a long
time since I done any proof on formulas.
Bowditch give the factor of 1.17 for the distance to visible horizon, and
"The Calculator Afloat" uses 1.14 for its factor for the same formula.
Although Bowditch does state that its formula is to the visible horizon,
while "The Calculator Afloat" state only to the horizon. Not visible?????
Still...............
Learning the Hard Way!!
Millard Kirk KB8YQO Email - mkirk@XXX.XXX
116 Lewis Ave Homepage- http://webpages.marshall.edu/~mkirk/
Barboursville, WV A West Virginia Blue Water Sailor
25504 (304) 736-6544
First United Methodist Church, Barboursville, WV
Homepage http://www.gbgm-umc.org/bfumcwv/
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