Glen Van Brummelen is professor of mathematics at Quest University Canada. He is the coeditor of Mathematics and the Historian's Craft and the coauthor of Calculus Explorations Powered by Technology: Tales of History and Imagination.

"I highly recommend the book to all those interested in the way in which the ancient people solve their practical problems and hope that the next volume of this interesting history of spherical and plane trigonometry will appear soon."---Cristina Blaga, Studia Mathematica --- "Van Brummelen's history does far more than simply fill a vacant spot in the historical literature of mathematics. He recounts the history of trigonometry in a way that is both captivating and yet more than satisfying to the crankiest and most demanding of scholars. . . . The Mathematics of the Heavens and the Earth should be a part of every university library's mathematics collection. It's also a book that most mathematicians with an interest in the history of the subject will want to own."---Rob Bradley, MAA Reviews --- "[T]his book will have wide appeal, for students, researchers, and teachers of history and/or trigonometry. The excerpts selected are balanced and their significances well articulated. . . . It is a book written by an expert after many years of exposure to individual sources and in this way Van Brummelen uniquely advances the field. The book will no doubt become a necessary addition to the libraries of mathematicians and historians alike."---Clemency Montelle and Kathleen M. Clark, Aestimatio --- "[T]his new and comprehensive history of trigonometry is more than welcome--even more so because it is the first in English. . . . [T]his book will be appreciated by many with an interest--general or more specific--in the history of mathematics."---Steven Wepster, Centaurus --- "Fans of the history of mathematics will be richly rewarded by this exhaustively researched book, which focuses on the early development of trigonometry. . . . Finally, the generous and lucid explanations provided throughout the text make Van Brummelen's history a rewarding one for the mathematical tourist."