RBarryYoung (2/17/2009)
kevin (2/17/2009)
Because the earth is not strictly spherical (it "flattens" a bit due to its rotation), there's a mathematical adjustment that can be made which makes the result even more accurate, given any two locations worldwide.That's correct, the earth is an oblate spheroid (sort of), so any calculation based on a sphere (as mine is) has some amount of error, that varies from place to place on the planet.
In my case, because I have used the equatorial radius (the maximum) the error varies from about 0% at the equator to about +2% at the poles (where we rarely drive or fly).
Joke time taking advantage of the margin of error:
Pilot flying over the USA gets lost, asks copilot where he is within reasonable certainty. Copilot says "it's either Florida or Georgia"
Ba-dum dum. Don't forget to tip your Dark Lord.
I believe that my function is appropiate for most general uses.
That's because you don't know what devious plans we have! Sharks with frickin' lasers on their heads!
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"stewsterl 80804 (10/16/2009)I guess when you stop and try to understand the solution provided you not only learn, but save yourself some headaches when you need to make any slight changes."