What is a Moveable Feast?
While doing some research online, I found out that the Easter holiday belongs to the “moveable feast”. It got this name since Good Friday and Palm Sunday are celebrated on different dates each year, as the date is connected with the celebration of Jewish holiday, Passover.
In one of the articles I read titled, “The Ancient Math That Sets the Date of Easter and Passover”, published in the Atlantic, Robinson Meyer shared a lot of interesting facts. Turns out that in AD 325, during the First Council of Nicaea, the Church leaders decided to set the date of Easter on the first Sunday following the first full Moon of Spring. Thus, instead of following the Gregorian calendar, the holiday follows a lunisolar calendar, similar to the Jewish calendar.