Changes

Pascha normally falls either one or five weeks later than the feast as observed by Christians who follow the [[Gregorian calendar]]. However, occasionally the two observances coincide, and some years they can be two, four, or six weeks apart (but never three). The reason for the difference is that the older [[Julian Calendar]] uses a different [[paschalion]], the formula for calculating the date of Pascha. This formula was determined by the [[First Ecumenical Council]].

If Pascha falls on [[March 25]], the date of the [[Annunciation]], the resultant celebration is termed ''[[Kyriopascha]]''.