Tools for creating a calendar, Fig. 1: Sunday letters and weekdays of January 1 in the Julian calendar, Fig. 2: Finding the Easter feast according to the Julian calendar, Fig. 3: Mobile Sundays and holidays, Fig. 4: Sunday letters, and weekdays of January 1 in the Gregorian calendar, Fig. 5: Gregory., Epacten from 1700 to 1800, Fig. 6: Invention of the Easter festival according to the Gregorian calendar, Tab. XXXIII, S. 40, Tobias Mayer: Mathematischer Atlas, in welchem auf 60 Tabellen alle Theile der Mathematic vorgestellet und nicht allein überhaupt zu bequemer Wiederholung, sondern auch den

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