A concurrent was the weekday of 24 March in the

Julian calendar The Julian calendar, proposed by Roman consul Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on , by edict. It was designed with the aid of Greek mathematicians and astronomers such as Sosigenes of Alexandr ...

counted from , regarding as Sunday. It was used to calculate the Julian Easter during the Middle Ages. It was derived from the weekday of the first day of the Alexandrian calendar during the 4th century, , counting Wednesday as (see Planetary hours#History). Therefore, the following was a Sunday and the following was also a Sunday.. The pages in this edition have numbers six less than the corresponding pages in the original edition, so six must be subtracted from most internal page references in this edition's index, etc. It was first mentioned by

Dionysius Exiguus Dionysius Exiguus (Latin for "Dionysius the Humble", Greek: Διονύσιος; – ) was a 6th-century Eastern Roman monk born in Scythia Minor. He was a member of a community of Scythian monks concentrated in Tomis (present day Constanța, ...

in 525 in his Latin version of the original Alexandrian Church's Greek

computus As a moveable feast, the date of Easter is determined in each year through a calculation known as (). Easter is celebrated on the first Sunday after the Paschal full moon, which is the first full moon on or after 21 March (a fixed approxi ...

. The insertion of the sixth

epagomenal The intercalary month or epagomenal days. of the ancient Egyptian, Coptic, and Ethiopian calendars are a period of five days in common years and six days in leap years in addition to those calendars' 12 standard months, sometimes reckoned as thei ...

day immediately before was compensated for by the bissextile day inserted six months later into the Julian calendar. The widely used post-Bedan solar cycle (first year 776), which repeats every 28years, had concurrents of :1 2 3 4 6 7 1 :2 4 5 6 7 2 3 :4 5 7 1 2 3 5 :6 7 1 3 4 5 6. It skips a concurrent every four years due to a bissextile day in the Julian calendar a month earlier. The Sunday after the next was Easter Sunday (see Computus#Julian calendar). The concurrent is not used by the Gregorian Easter.

References

{{Easter Easter date Julian calendar