The "computus" is the procedure of determining the first Sunday after the first ecclesiastical full moon falling on or after 21 March, and the difficulty arose from doing this over the span of centuries without accurate means of measuring the precise tropical year.

The synodic month had already been measured to a high degree of accuracy.

The Catholic and Protestant denominations thus use an ecclesiastical full moon that occurs four, five or 34 days earlier than the eastern one.

The earliest and latest dates for Easter are 22 March and 25 April.

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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.The name has been used for this procedure since the early Middle Ages, as it was considered the most important computation of the age.For most of their history Christians have calculated Easter independently of the Jewish calendar.These tools are employed widely the actual day World and work to repair all the settings that create the blue screen error.One does get a good registry tool, it could stop the blue screens of death in relation to your PC clean.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.