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Great Circle calculated and plotted

I wrote a program, two programs actually, one in Mathcad and another in Excel, which calculate the parameters of a Great Circle defined by any two points. The programs also calculate the bearing angle of the second location, as seen by the first location; and they also calculate the distance between the two locations, along the arc of the Great Circle.
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Permanent link to this article: http://w7buf.com/2011/08/14/link_to_great_circle/

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