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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: query
From: Peter Fogg
Date: 2002 Aug 23, 08:14 +1000
From: Peter Fogg
Date: 2002 Aug 23, 08:14 +1000
The formula I am using at the moment goes: lat2 = lat1 + [(nm/60) x cos TC] then work out the middle latitude (ML): ML = lat1+lat2 / 2 long2 = long1 + [(nm/60) x (sinTC/cosML)] I hope you can follow my notation - '/' means 'divided by'. TC needs to be in the 0-90� range. North and East are positive values, South and West are negative. This formula is not especially accurate (probably doesn't need to be) and I shall be interested to try out the other formulas suggested. Mitch B Burrill wrote: > 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 ? > I have looked everywhere for this, I must be doing something wrong. > > Thanks ! > > Mitch Burrill > mburrill@leesburgva.org
