## Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry

By Glen Van Brummelen

Spherical trigonometry used to be on the middle of astronomy and ocean-going navigation for 2 millennia. The self-discipline used to be a mainstay of arithmetic schooling for hundreds of years, and it used to be a customary topic in excessive faculties until eventually the Fifties. at the present time, in spite of the fact that, it's hardly ever taught. *Heavenly Mathematics* strains the wealthy historical past of this forgotten artwork, revealing how the cultures of classical Greece, medieval Islam, and the trendy West used round trigonometry to chart the heavens and the Earth. Glen Van Brummelen explores this beautiful department of arithmetic and its position in old astronomy, geography, and cartography; Islamic non secular rituals; celestial navigation; polyhedra; stereographic projection; and extra. He conveys the sheer fantastic thing about round trigonometry, offering readers with a brand new appreciation for its based proofs and sometimes fabulous conclusions.

*Heavenly Mathematics* is illustrated all through with attractive ancient photographs and informative drawings and diagrams which were used to educate the topic long ago. This targeted compendium additionally gains easy-to-use appendixes in addition to routines on the finish of every bankruptcy that initially seemed in textbooks from the eighteenth to the early 20th centuries.