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Calendrical Calculations, Third Edition by Edward M. Reingold, Nachum Dershowitz

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        The calendar monument at Medinet Habu, Thebes, including dates of celebrations and sacrifices. From the reign of Ramses III (twelfth century B.C.E.). (Courtesy of the Oriental Institute, University of Chicago, Chicago, IL.)

4The Coptic and Ethiopic Calendars

Kiyahk: imageabāak misāk [In Kiyahk, your morning is your evening.]

—Coptic rhyme about the short days of winter

Both the Coptic and Ethiopic calendars have the same leap-year structure as does the Julian (1 year out of 4 is leap), but their months follow a more regular pattern.

4.1 The ...

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