The Smithsonian collections are particularly rich in models for spherical trigonometry by Worcester, Massachusetts, high school teacher A. Harry Wheeler and his students. Examples of these models have ...

As in the case of the “Plane Trigonometry,” the author's great indebtedness to Prof. Neuberg, ... A Treatise on Spherical Trigonometry, and its Application to Geodesy and Astronomy.

They are great circles with centres at the Earth’s centre. Flights from Paris to Vancouver pass over Greenland, far to the north of both cities, following a great circle route.

THE author of this book, who is one of the naval instructors on H.M.S. Britannia, has brought together the most important rules which are used in the solution of spherical triangles, and, after ...