Given the recent use of the law of cosines for spherical trig I thought that I would share a nice technique that I discovered using rotation matrices to derive the law of cosines and the law of sines for spherical triangles.
There is a two page PDF document at http://www.wengersundial.com/SphericalTrig.pdf that gives the derivation. Enjoy. Dan Wenger Daniel Lee Wenger Santa Cruz, CA [EMAIL PROTECTED] http://wengersundial.com http://wengersundial.com/wengerfamily
