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The movement of a computus clock provides and/or calculates astronomical and calendar information according to the tradition that Easter Sunday is the first Sunday after the first full moon (Paschal or ecclesiastical full moon) on or after the spring equinox (21 March), and Easter Sunday should not occur on the same day as the Jewish calendar date Nisan 15th, the first day of Passover week.
The tabular Byzantine calendar is used to calculate the date of Easter. It dates back to AD 284, when the new moon fell on the fifth epagemonal day of the Alexandrian calendar (28 August). Eusebius (vii.32) recounts that Anatolius of Laodicea was the first to arrange the 19-years cycle (when the new moon returns to the same Julian date) for ...
original calculation for Julian calendar Eastern or Orthodox original calculation for Julian calendar converted to Gregorian calendar Western or Roman or Gregorian revised calculation for Gregorian calendar. This is default method if not given. Eastern to calculate Easter date in the Orthodox rite. day
The Greek Orthodox Church uses the Julian calendar, not the Gregorian calendar that most other Christian believers (and secular civilizations) use. Greek Easter is also dictated by the Hebrew ...
The calculations produce different results depending on whether the Julian calendar or the Gregorian calendar is used. For this reason, the Catholic Church and Protestant churches (which follow the Gregorian calendar) celebrate Easter on a different date from that of the Eastern and Oriental Orthodoxy (which follow the
The Eastern Orthodox liturgical calendar describes and dictates the rhythm of the life of the Eastern Orthodox Church.Passages of Holy Scripture, saints and events for commemoration are associated with each date, as are many times special rules for fasting or feasting that correspond to the day of the week or time of year in relationship to the major feast days.
A conversion tool for all three variant calendars, good for AD dates 1911–2030, also with ability to display Zoroastrian dates on a month-to-view page of the Gregorian calendar for 1911–1930. Another implementation of the zanc.org calendar above. RozCalc – Zoroastrian Calendar Calculator; Parsical – Zoroastrian Shahenshahi calendar ...
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).