Computus (Latin for computation) is the calculation of the date of Easter in the Christian calendar. The name has been used for this procedure since the early Middle Ages, as it was one of the most important computations of the age. The canonical rule is that Easter Sunday is the first Sunday after the 14th day of the lunar month (the nominal full moon) that falls on or after 21 March (nominally the day of the vernal equinox). For determining the feast, Christian churches settled on a method to define a reckoned "ecclesiastic" ...

Including:

• Computus - History
• Computus - Theory
• Computus - Tabular methods
• Computus - Gregorian calendar
• Computus - Julian calendar
• Computus - Algorithms
• Computus - Gauss's algorithm
• Computus - Meeus/Jones/Butcher Gregorian algorithm
• Computus - Meeus Julian algorithm

Read more here: » Computus: Encyclopedia - Computus

Computus - Gregorian calendar. This method for the computation of the date of Easter was introduced with the Gregorian calendar reform in 1582. First determine the epact for the year. The epact can have a value from "*" (=0 or 30) to 29 days. The first day of a lunar month is considered the day of the New Moon. The 14th day is considered the day of the Full Moon. The epacts for the current (anno 2003) Metonic cycle are: (M=March, A=April) This table can be extended for previous and following 19-y ...

See also:

Computus, Computus - History, Computus - Theory, Computus - Tabular methods, Computus - Gregorian calendar, Computus - Julian calendar, Computus - Algorithms, Computus - Gauss's algorithm, Computus - Meeus/Jones/Butcher Gregorian algorithm, Computus - Meeus Julian algorithm

Read more here: » Computus: Encyclopedia II - Computus - Tabular methods

The solar year is always counted to have 365 days (excluding a small remainder). A lunar year of 12 months is counted to have 354 days, meaning the average lunation is 29½ days (excluding another small remainder). The solar year is 11 days longer than the lunar year. Supposing a solar and lunar year start on the same day, with a crescent new moon indicating the beginning of a new lunar month on 1 January, 11 days of the new lunar year will have already passed by the commencement of the new solar year. After two years the difference will hav ...

See also:

Computus, Computus - History, Computus - Theory, Computus - Tabular methods, Computus - Gregorian calendar, Computus - Julian calendar, Computus - Algorithms, Computus - Gauss's algorithm, Computus - Meeus/Jones/Butcher Gregorian algorithm, Computus - Meeus Julian algorithm

Read more here: » Computus: Encyclopedia II - Computus - Theory

Easter is the most important Christian feast. Accordingly, the proper date of its celebration has been a cause of much controversy, at least as early as the meeting (c. 154) of Anicetus, bishop of Rome and Polycarp, bishop of Smyrna. The problem for Christians using the solar Julian calendar was that the passion and resurrection of Jesus occurred during the Jewish feast of Passover, which Jews celebrate accordi ...

See also:

Computus, Computus - History, Computus - Theory, Computus - Tabular methods, Computus - Gregorian calendar, Computus - Julian calendar, Computus - Algorithms, Computus - Gauss's algorithm, Computus - Meeus/Jones/Butcher Gregorian algorithm, Computus - Meeus Julian algorithm

Read more here: » Computus: Encyclopedia II - Computus - History