In Western Christianity, Easter is always celebrated on the Sunday immediately following the Paschal Full Moon date of the year, which is established using an ecclesiastical calendar ... "the Paschal Full Moon is the first Ecclesiastical Full Moon date after March 20 (which happened to be the vernal equinox date in 325 AD)."
There are a lot more holidays around the world, some whose date is set with reference to a particular date (Australians celebrate Australia Day on January 26 because that specific date has historical significance), some with reference to a time of the year or month (Australians celebrate Mother's Day on the second Sunday in May, other countries use different definitions for the date of this holiday), some with reference to a solar or lunar calandar (Muslims celebrate Ramadan in the ninth month of the Islamic calendar, which is a lunar calendar). It just depends on how the holiday is originally defined. (And some change - I remember celebrating Washington's Birthday on February 22; then having it change to the third Monday in February, then change its name to Presidents' Day).
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