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Understanding the Jewish Calendar presents the scientific and mathematical ideas of the Rishonim on the calendar in a clear and simply terminology and form for the modern reader. The principles are all explained step by step, and the calculations are worked out and explained so that they can be understood without previous background i the subject.
The book is divided into two parts. The first part deals with astronomy and serves as an introduction to the principles of the calendar. The second part explains the actual principles and calculations of the calendar.