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Church of Estonia (Ecumenical Patriarchate)
Because of the difference between the astronomical vernal equinox and the theoretical vernal equinox calculated by the [[Julian Calendar]]—the latter of which is used by both the [[Julian Calendar]] and the [[Revised Julian Calendar]] to [[Paschalion|calculate Pascha]]—Kyriopascha never occurs on the Revised Julian Calendar, while it can occur on the Julian. It can also occur on the [[Gregorian Calendar]], however, which uses the astronomical vernal equinox to calculate the date of Pascha.
As such, Kyriopascha can be celebrated by the Old Calendar churches and those New Calendar churches which use the Gregorian Calendar (i.e., [[Church of Finland|Finland]] and [[Church of Estonia(Ecumenical Patriarchate)|Estonia]]), though it will not occur in the same year.
The elimination of Kyriopascha from the cycle of the Revised Julian Calendar is one of the criticisms leveled against those who use that reckoning.