The Geometre's Grimoire: How Geometry Became Trigonometry

By Raymond Saltpeter

This book is filled with the technical knowledge that was of interest to Hermetic practitioners like John Dee, father of Enochian magic. Within this book you will learn the geometry proofs of the Ancient Greeks as influenced by the Babylonians, Egyptians and Pythagoreans. The geometry of eyesight and how Aristarchus used it to approximate the sizes of the Earth, Moon and Sun. Then the Ptolemaic system which used a table of chords to measure the yearly movements of the Sun and the planets through the sky. Then finally, how the Hindus modified the table of chords to a table of half-chords, and how the half-chord came to be known as a sine. All the while providing easy to follow explanations and historical context for the development of trigonometry, a technique that's still used today.

• Format: Paperback
• Language: English
• ISBN: B08F719JW3
• ISBN13: 9798644631315
• Release Date: August 2020
• Publisher: Independently Published
• Length: 254 Pages
• Weight: 1.31 lbs.
• Dimensions: 0.5" x 8.5" x 11.0"