Meeting Nov. 19 with Mar Awa III, the head of the Assyrian Church of the East, Francis called for an end to disagreements in how Catholics and Eastern churches determine the date of Easter each spring.
“Let us have the courage to put an end to this division that at times makes us laugh: ‘When does your Christ rise again?,’” Francis told Mar Awa in remarks following their meeting at the Vatican. “I’m willing, yet not [only] me, the Catholic Church is willing to follow what Saint Paul VI said. Agree and we will go where you say,” the pontiff added.
The two bodies fell out over the calculation of Easter after the introduction of the Gregorian Calendar by Pope Gregory XII in 1582. Eastern Orthodox churches still use the Julian Calendar, proposed by Julius Caesar in 46 A.D. The two calendars are 13 days apart, with the Julian trailing the Gregorian.
There is also a question of how the date for Easter should be calculated. The Council of Nicea in 325 A.D. said Easter should be celebrated on the Sunday following the first full moon that falls on or after the spring equinox. In practice, this means Easter can fall between March 22 and April 25.
Orthodox Churches have a different requirement: Easter, or Pascha, must take place following the Jewish observance of Passover.