This book begins with a short overview of calendars in general, and then delves deeply into Jewish calendar structure and mathematics. Details of how Torah portions are scheduled and how the structured triennial Torah reading and haftorah reading cycles work are explained. A comprehensive explanation of the calendrical aspects of Jewish holidays as well as the relationships between them and non-Jewish holidays is included. There are fourten appendices which allow even greater visibility into the material than does the main narrative by itself. This volume also includes substantial new material absent from the book's predecessor. A glossary is provided.