NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: query
From: Michael Wescott
Date: 2002 Aug 21, 15:57 -0400
From: Michael Wescott
Date: 2002 Aug 21, 15:57 -0400
> If I am at lat1, long1, and go XXX nm at TC YYY, What is the exact > formula from spherical trigonometry to get lat2, long2 ? > It would be constant TC. An exact formula conforming to one of the standard ellipsoids requires some rather hairy integral calculus. For practical purposes, a reasonable solution is to use "Mercator Sailing". See chapter 24 of the American Practical Navigator (a.k.a. Bowditch) on the web at "http://pollux.nss.nima.mil/pubs/". This method uses meridional parts (see "Table 6" and "Explanation of Navigational Tables" in the same pub). -- Mike Wescott Wescott_Mike@EMC.COM