In 325CE the Council of Nicaea established that Easter would be held on the first Sunday after the first full moon occurring on or after the vernal equinox.(*) From that point forward, the Easter date depended on the ecclesiastical approximation of March 21 for the vernal equinox.
Easter Sunday celebrates the Christian belief of Jesus Christ's resurrection.
The Easter date is set around the time of the March Equinox.
The March equinox coincides with Easter Sunday and holidays that are related to it.
These holidays do not fall on a fixed date in the Gregorian calendar, or the Julian calendar, which is still used by many Orthodox Christian churches.
The dates of many Christian holidays depend on the Easter date.
Some of these holidays include: According to the Bible, Jesus’ death and resurrection occurred around the time of the Jewish Passover, which was celebrated on the first full moon following the vernal equinox.This soon led to Christians celebrating Easter on different dates.At the end of the 2nd century, some churches celebrated Easter on the day of the Passover, while others celebrated it on the following Sunday.Some churches still observe Easter under the Julian calendar.The Gregorian calendar was created because the Julian calendar was slightly too long.With the Julian calendar, the equinox date moved towards the earlier dates of March and further away from the Easter.