Earth radius in km
Greetings Eric!
I tried your "Great circle azimuth
bearing and range calculator"
and have a suggestion for a better "great circle radius": You
use "111.15/deg" which corresponds to a radius of about 6368.4259
What--if any--equation/theory is it based on? None - it was just my approximation for earth radius.
A much better "great circle radius" would be the ELLIPSOIDAL
(not just elliptical) quadratic mean radius, which equals
[.25 * (3a^2 + b^2)]^.5, which, for Earth (a = 6378.135, b = 6356.75),
works out to 6372.795477598, or about 111.226264/deg
~Kaimbridge~
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► Earth radius in km - Page created 12 Sept 2004