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Milankovic selected this rule, which produces an average year length of 365.242222… days, because it was within two seconds of the then current length of the ''mean'' tropical year. However, the ''vernal equinox'' year is slightly longer, so for a few thousand years the Revised Julian Calendar doesn't do as good a job as the Gregorian Calendar at keeping the vernal equinox on or close to [[March 21]]. But the length of a day is increasing by about 1.7 milliseconds per century (due to tidal acceleration), so the number of days per year decreases by about 0.0001 each millennium. This means that in the long run, the Revised Julian Calendar will also be inaccurate even if the mean tropical year is the basis.
The Revised Julian calendar was adopted by the Orthodox Churches of [[Church of Constantinople|Constantinople]], [[Church of Alexandria|Alexandria]], [[Church of Antioch|Antioch]], [[Church of Greece|Greece]], [[Church of Cyprus|Cyprus]], [[Church of Romania|Romania]], [[Church of Poland|Poland]], and [[Church of Bulgaria|Bulgaria]] (the last in 1963), called the '''''New Calendarists'''''. It was rejected by the Orthodox Churches of [[Church of Jerusalem|Jerusalem]], [[Church of Russia|Russia]], [[Church of Serbia|Serbia]], and the [[Old Calendarists]]. Despite the fact that the Russian Orthodox Church continues to use the Julian Calendar for both its [[fixed festivals feasts]] and for EasterPascha, Milankovic stated that it had already adopted the new calendar by October 1923! (It must have repudiated its decision shortly thereafter.)
The synod also adopted an astronomical rule for [[Pascha]]: Pascha is the Sunday after the midnight-to-midnight day at the meridian of the [[Church of the Holy Sepulchre (Jerusalem)|Church of the Holy Sepulchre]] in Jerusalem during which the first full moon after the vernal equinox occurs. Although the instant of the full moon must occur after the instant of the vernal equinox, it may occur on the same day. If the full moon occurs on a Sunday, Easter is the following Sunday. However, all Orthodox churches rejected this rule and continue to use the Julian Calendar to determine the date of Pascha (except for the [[Church of Finland]], which uses the Gregorian Pascha).