Includes bibliographical references (p. [411]-428) and index

pt. 1. Calendar in theory -- ch. 1. Calendar -- ch. 2. Astronomical background -- ch. 3. Time and the clock -- ch. 4. Writing and libraries -- ch. 5. Numbers and arithmetic -- ch. 6. Variety of calendars -- ch. 7. Reform of the calendar -- pt. 2. Calendars of the world -- ch. 8. Introduction -- ch. 9. Prehistoric calendars -- ch. 10. Calendars of Babylon and the Near East -- ch. 11. Egyptian calendar -- ch. 12. Calendars of China and East Asia -- ch. 13. Calendars of India -- ch. 14. Mayan and Aztec calendars -- ch. 15. Four European calendars -- ch. 16. Roman and Julian calendars -- ch. 17. Jewish calendar -- ch. 18. Islamic and Bahái︣ calendars -- ch. 19. Gregorian calendar -- ch. 20. French Republican calendar -- ch. 21. Week -- pt. 3. Calendar conversions -- ch. 22. Calendar conversions -- ch. 23. Mathematical notes -- ch. 24. To calculate the day of the week -- ch. 25. Conversion of regular calendars -- ch. 26. Jewish calendar -- ch. 27. Mayan calendar -- pt. 4. Easter -- ch. 28. Short history of Easter -- ch. 29. Date of Easter Sunday -- ch. 30. Book of hours

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