Revised Julian calendar
In May 1923, the controversial , called by Patriarch Meletius IV of Constantinople, adopted this calendar under the name of Revised Julian calendar, incorporating a modification of Serbian astronomer Milutin Milanković which ensured it would not diverge from the Gregorian for a further 800 years. This replaced the tabular Easter of the Julian calendar with the astronomical Easter. Not all Orthodox churches were represented at the congress or adopted its decisions, and the Russian Orthodox Church and other Orthodox churches, governing a majority of Orthodox Christians, have continued to use the Julian calendar liturgically to this day. In 1924, the Synod of Bishops of the Church of Greece, following the lead of other Orthodox churches, voted to accept the Revised Julian calendar for fixed feasts, maintaining the traditional Julian calendar Paschalion for calculating the date of Pascha and all of the moveable feasts dependent on it.