note
dws
<i>I recently found the need to take two coordinates and find the distance between them</i>
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The distance between two points is usually given as the "great sphere" distance, which is calculated using spherical trigonometry. The direct distance is seldom used, since crows can't fly underground. A quick google search for "calculate great sphere distance" finds [http://www.auslig.gov.au/geodesy/datums/distance.htm|this page], which details the calculation.
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