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 ...

THIS is a sequel to the large “Plane Trigonometry” by the same writer, and is naturally drawn up on the same plan. Its size is handy, and yet it contains a very large amount of matter. Much of ...

Related Stories. Index theory wins top maths prize, Science Online, 30 Mar 2004; Maths genius tames complex systems, Science Online, 27 May 2005; Cracked! Maths solves old war code, Science Online ...

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 ...

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.