Topic: longitude list of topics
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	Great circle course		2012-01-25
		From Hervé: On the earth, the mathematical formula giving the distance between two points, and the initial course for a boat on the great circle is well known. I need to find the inverse formula, ie knowing an initial position on earth, and the initial course of the boat, and the distance to run on the great circle, the formula gives the final position (longitude and latitude). Answered by Robert Dawson.
	Finding the center of a circle that goes through three given points		2007-09-16
		From Gary: I am given three points represented by their Latitude and Longitude. How do I determine the Latitude and Longitude of the center of a circle through the three given points? The lat/lon of the three points are: A. N 43 degrees 30.251 min. W 96 degrees 45.695 min. B. N 43 degrees 30.006 min. W 96 degrees 45.082 min. C. N 43 degrees 30.719 min. W 96 degrees 45.410 min. Thanks. Answered by Stephen La Rocque.
	The Earth's Arc		1998-02-06
		From Robert Dyck: How do I find the arc/mile of the earths surface? What is the arc? Answered by Harley Weston.

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