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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Dip
From: Millard Kirk
Date: 1998 Dec 09, 10:27 PM
From: Millard Kirk
Date: 1998 Dec 09, 10:27 PM
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@marshall.edu 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/ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@roninhouse.com: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
