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

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        Finger calculation for the date of Easter, according to the Gregorian rule, from page 14 of Astronómica y Harmoniosa Mano by Buenaventura Francisco de Ossorio, Bibliotheca Mexicana, Mexico, 1757. For an explanation of the calculation, see Florian Cajori’s “A Notable Case of Finger-Reckoning in America,” ISIS 8 (1926), pp. 325–327. Courtesy of the Bancroft Library, University of California, Berkeley.

8The Ecclesiastical Calendars

We send you the good news concerning the unanimous consent of all in reference to the celebration of the most solemn feast of Easter, for this difference also has been made up by the assistance of your prayers, ...

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