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_Astronomical Algorithms_ by Jean Meeus lists the following years between 1900 & 2100 when the Gregorian Easter differs from "the purely astronomical rule": 1900, '03, '23, '24, '27, '43, '54, '62, '67, '74, 1981, 2038, '49, '69, '76, '89, '95, 2096. So we seem to be near the middle of an 'accurate patch'. The most frequent date is April 19. Meeus also mentions that the dates of Julian Easter, according to the Julian (Old Style) calendar, repeat every 532 years. During that time the discrepancy between the Julian and Gregorian calendars increases by three to five days.