This early work on spherical trigonometry is both expensive and hard to find in its first edition. It contains a comprehensive account of the subject and includes numerous examples and exercises. This is a fascinating work and highly recommended for anyone interested in learning spherical trigonometry. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

John Casey is a novelist and Pushcart Prize-nominated poet from New Hampshire. He is the author of The Devolution Trilogy, a psychological spy thriller series, Raw Thoughts: A Mindful Fusion of Poetic and Photographic Art, which garnered nominations for the Griffin Poetry Prize and National Book Award, and the sequel, Meridian: A Raw Thoughts Book. Casey also co-authored The Barn: A Mystery Novella. His poetry has appeared internationally in numerous literary journals and magazines. A Veteran combat and test pilot, John Casey also served as a diplomat and international affairs strategist at U.S. embassies in Europe and Africa, at the Pentagon, and elsewhere. He is passionate about fitness, nature, and travel and inspired by the incredible spectrum of people, places and cultures he has experienced in life.