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Spherical Trigonometry, Arc Distance Formula - http://www.jqjacobs.net/astro/arc_form.html
Finding the shortest distance between two points on the earth given latitude and longitude. Download ARC_CALC_3, Microsoft Excel version, A Spherical Triangle Calculator by James Q. Jacobs. |
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References for Non-Euclidean Geometry - http://www-history.mcs.st-andrews.ac.uk/history/HistTopics/References/Non-Euclidean_geometry.html
A bibliographic reference list of books and articles on non-Euclidean geometries, part of the MacTutor History of Mathematics archive. |
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Seminar on the History of Hyperbolic Geometry - http://www.math.columbia.edu/~pinkham/teaching/seminars/NonEuclidean.html
Seminar notes by Greg Schreiber. |
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Minkowskian geometry and quaternion algebras - http://www.geocities.com/timsheltonjones/
An exploration of the geometry of quaternion algebra, including a commutative variant which exhibits the properties of Minkowskian geometry. |
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Non-Euclidean Geometry with LOGO - http://www.bham.ac.uk/ctimath/reviews/logo.html
Review of a new version of LOGO developed at Cardiff. |