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Subject: Re: query
From: Peter Fogg (ffive@XXX.XXX)
Date: Thu Aug 22 2002 - 18:14:04 EDT
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@XXX.XXX
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