A calendar of the dates of Easter, for the 95 years 532–626, marble, in the Museum of Ravenna Cathedral, Italy. Five 19-year cycles are represented as concentric circles. Dates are given using the system of the Roman calendar, as well as the day of the lunar month.
Chronological diagram of the date of Easter for 600 years, from the Gregorian calendar reform to the year 2200 (by Camille Flammarion, 1907).