Easter table double dating

Easter is the most important Christian feast, and the proper date of its celebration has been the subject of controversy as early as the meeting of Anicetus and Polycarp around 154.According to Eusebius' Church History, quoting Polycrates of Ephesus, churches in the Roman Province of Asia "always observed the day when the people put away the leaven", namely Passover, the 14th of the lunar month of Nisan.The name has been used for this procedure since the early Middle Ages, as it was considered the most important computation of the age.

The vernal equinox is fixed to fall on 21 March (previously it varied in different areas and in some areas Easter was allowed to fall before the equinox).

The full moon is an ecclesiastical full moon determined by reference to a lunar calendar, which again varied in different areas.

Because of these perceived defects in the traditional practice, Christian computists began experimenting with systems for determining Easter that would be free of these defects.

But these experiments themselves led to controversy, since some Christians held that the customary practice of holding Easter during the Jewish festival of Unleavened Bread should be continued, even if the Jewish computations were in error from the Christian point of view.

In the Western/Gregorian calendar those dates are as commonly understood.

However, in the Orthodox/Eastern Churches, while those dates are the same, they are reckoned using the Julian calendar; therefore, on the Gregorian calendar as of the 21st century, those dates are 4 April and 8 May.Dionysius's tables replaced earlier methods used by the Church of Rome.The earliest known Roman tables were devised in 222 by Hippolytus of Rome based on 8-year cycles.Having deviated from the Alexandrians during the 6th century, churches beyond the eastern frontier of the former Byzantine Empire, including the Assyrian Church of the East, The Alexandrian computus was converted from the Alexandrian calendar into the Julian calendar in Rome by Dionysius Exiguus, though only for 95 years.Dionysius introduced the Christian Era (counting years from the Incarnation of Christ) when he published new Easter tables in 525.And it was explicitly stated by Peter, bishop of Alexandria that "the men of the present day now celebrate [Passover] before the [spring] equinox...through negligence and error." Another objection to using the Jewish computation may have been that the Jewish calendar was not unified.

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