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Western and Eastern Easter celebrations
The Eccumenical Synod of 325 AD that took place in Nice of Bithyni, decided that Easter will be celebrated on the first Sunday after the first full moon following the Spring solstice. Since then, all Christians celebrated Easter at the same time until 1582 when the then Pope Gregorios XIII applied the New Calendar, resulting in differences between the New and Old calendars which brought on the different Easter dates between the Western and Eastern Churches.
The Eastern Church accepts the 20th of March of the OLD calendar as the day of the Spring Solstice, which is the 2nd of April of the NEW calendar. The Western Churches accept as date the 20th of March of the NEW calendar.
In other words, while we celebrate Easter the first Sunday that follows the full moon after 2nd April, the Western Churches celebrate celebrate Easter the first Sunday that follows the full moon after 20th March. As a result, in a period of 4 years, Western Churches will celebrate Easter one week before our Easter, for one year more than 30 days after ours (like in 2024) and for one year the Easter celebrations coincide (as in 2025).