A Perpetual Calendar: With Notes And Explanations On Chronology, Chronological Cycles And Other Useful Information (1896) is a comprehensive guide to the history of timekeeping and the various methods used to measure and track time. Written by L.S.F. Pinaud, the book includes detailed explanations of the different types of calendars and chronologies used throughout history, as well as information on the cycles of the moon, the sun, and other celestial...