The paschal season is coming to an end, and summer is well upon us. It was a late date for Orthodox Pascha this year. M.J. Montes has a page dedicated to the dating of Pascha: The Date of Orthodox Easter 1875 to 2124. He lists the years on which Pascha falls on a certain date, given in both the Julian and Gregorian reckoning. This year, Pascha fell on April 22 (Julian) / May 5 (Gregorian). That is late on average. In the range covered (A.D. 1875 - 2124), Pascha falls on that Julian date annis domini 1907, 1918, 1929, 2002, 2013, 2024, and 2097 and on that Gregorian date annis domini 1907, 1918, 1929, 2002, 2013, 2024, 2097, and 2108. The difference is due to the two systems’ becoming a further day apart from A.D. 2100. Using the Gregorian system, the only later dates for Orthodox Pascha are annis domini:
May 6—1888, 1945, 1956, 2040, and 2108
May 8—1983 and 2078
On the Julian calendar, I believe that April 25 is the last day on which Pascha may fall. However, the Gregorian date will get later as the two calendars’ discrepancy grows.
Mr. Montes has a neat table that shows how often in each century the Orthodox and Roman dates for Pascha coincide and differ (and by how many weeks): “Tables of Differences between the Dates of Orthodox and Western Easter, AD 1583 to AD 3000.” GM Arts also features nifty graphs of the discrepancies: “Easter Sunday Date FAQ.” Evidently, the last year of our Lord in which the Orthodox Churches and the Roman Church will celebrate Pascha on the same date is A.D. 2698. Pascha will fall on April 6 (Julian) / April 24 (Gregorian) that year.