I'm looking for the official formula for the calculation of the date of Easter currently in use with the Orthodox.
Also, does the formula differ based on whether the Julian vs Gregorian calendar is used (obviously the date could be different even using the same formula)?
1st Sunday after the 1st Full Moon after the Vernal Equinox, as long as the Passover has already fallen. However, one must remember that:
- The Vernal Equinox is calculated according to the Julian Calendar, and
- Like the RC Church, these dates were calculated well in advance (hundreds of years ago) and are now implemented according to a Paschal cycle, rather than being calculated on a year-by-year basis.