Re: formula for great circle computation

From:         "Garnet ,K" <gk@whidbey.com>
Organization: Whidbey Internet Services
Date:         13 Oct 95 01:30:21 
References:   1 2 3
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This is somewhat tricky in that one must be careful of the brackets.

Here goes.

D=60*arccos((sin lat1 x sin lat2)+(cos lat1 x cos lat2)x cos(long2-long1))


Initial Heading=Arccos(sin lat2-sin lat1 x cos(D/60) / sin (D/60) x

                cos lat1)

                where D=distance from above calculation.

If you use Excell I can e-mail you a spreadsheet which does this
chore.

Garnet.K email= gk@widbey.com