Most trigonometry students look at triangles on a flat surface. However, people from ancient astronomers to modern navigators calculated the arc lengths and angles of triangles on a sphere. They used ...

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 this ...

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 ...

Think outside the box — and build inside the globe! 🌍🏠 In this creative Minecraft tutorial, you’ll learn how to build a globe house using circular construction techniques, glass, wood, and glowstone ...

Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : 2 x 15cm ( 6 inch) 28 gauge ( wire diameter 0.3mm ) : 20cm ( 8 inch) 1.2cm spherical stone (cat's eye stone) You can flexibly change the material ...