NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Meridional Distances
From: Dan Hogan
Date: 2002 Sep 18, 09:28 -0700
From: Dan Hogan
Date: 2002 Sep 18, 09:28 -0700
For practical navigation I have been using Mercator Sailing and Meridional
Parts using the formula from The Calculator Afloat, by Shufeldt and Newcomer,
Naval Inst. Press, 1980, ISBN 0-87021-116-1.
M = 7915.7045 x Log tan (45d x L/2) - 23.2689 sin L
M = Meridional Part
L = latitude
For the 90d/270d problem I have changed the TC +/- 1d depending on the
hemisphere. Couldn't use Rhumb Line because it wouldn't fit in my HP 35SII
and still have my other DR formulae.
Dan Hogan WA6PBY
C27 "Gacha"
dhhogan1@earthlink.net
Nav-L Page: http://www.wa6pby.com
