Trigonometry | trigonometry | Spherical Earth | Spherical coordinate system | spherical aberration | Plancherel theorem for spherical functions |
In his mathematical inclinations, he was supported by Dr. G. R. Treviranus, who taught him the principles of spherical trigonometry.
Following Glen Van Brummelen (Reference 1 below, p. 129, stereographic projection), spherical trigonometry, though certainly no longer relevant to the older scientific needs of navigation, astronomy, geography, etc., other than as historical mathematics, has nevertheless seen a "rebirth" today due to simulation, game programming, Autodesk Maya, kinematics, physics engines, and many other new fields as diverse as optics, photography, art and medicine.