This fascinating book draws together a wealth of diverse material on the much-trusted (and rarely disputed) phenomenon we know as the calendar. From the fundamentals of astronomy to the world's ancient time-keeping schemes, to the development of the modern-day calendar, to the precise calculation of when specific dates occur (as in how one arrives at the date for Easter Sunday), this is a skillful yet approachable discussion of the calendar from both the historical and contemporary perspectives. Readers will even learn how to perform experiments and calculations for themselves by using such...