It is a week after Catholics and Protestants - and Western societies with them - that the Orthodox celebrated the resurrection of Christ this year.
Why this difference in dates?
In the wake of the Jewish calendar, the lunar calendar, and a decision taken at the Council of Nicaea in 325, Easter is traditionally celebrated on the Sunday following the full moon which follows March 21, the theoretical date of the equinox of spring.
It was on the advice of mathematicians and astronomers, highlighting a growing discrepancy between the official calendar and that of the sun, that Pope Gregory XIII instituted the so-called "Gregorian" calendar at the end of the 16th century, the countries Catholics passing without transition in one night from October 4 to 15, 1582.
But the Orthodox, not being bound by this Roman decision, stuck to the Julian calendar, instituted by Julius Caesar in 46 BC. This is what caused the "October" revolution to take place. in November 1917…
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