= 532) to obtain an entire 532 year medieval Easter cycle, whose first cycle ended with the year Era of Martyrs 247 (= 13×20) equal to year DXXXI. It is also because 532 is the product of the Metonic cycle of 20 years and the solar cycle of 28 years. It has 13 months in a year. Anno Mundi according to Panodoros Around AD 400, an Alexandrine monk called Panodoros fixed the Alexandrian Era (Anno Mundi = in the year of the world), the date of creation, on 29 August 5493 BC. After the 6th century AD, the era was used by Egyptian, Ethiopian, and Eritrean chronologists. The twelfth 532 year-cycle of this era began on 29 August AD 360, and so 4×19 years after the Era of Martyrs. Anno Mundi according to Anianos Bishop Anianos preferred the Annunciation style as New Year's Day, 25 March (see above). Thus he shifted the Panodoros era by about six months, to begin on 25 March 5492 BC. In the Ethiopian calendar this was equivalent to 15 Magabit 5501 B.C. (E.C.). The Anno Mundi era remained in usage until the late 19th century. Leap year cycle The four-year leap-year cycle is associated with the four Evangelists: the first year after an Ethiopian leap year is named the John-year, followed by the Matthew-year, and then the Mark-year. The year with the sixth epagomenal day is traditionally designated as the Luke-year. There are no exceptions to the four-year leap-year cycle, like the Julian calendar but unlike the Gregorian calendar. Months These dates are valid only from March 1900 to February 2100. This is because 1900 and 2100 are not leap years in the Gregorian calendar, while they are still leap years in the Ethiopian calendar, meaning dates before 1900 and after 2100 will be offset. See also Egyptian calendar Coptic calendar Computus Era of the Martyrs Adoption of the Gregorian calendar References Sources "The Ethiopian Calendar", Appendix IV, C.F. Beckingham and G.W.B. Huntingford, The Prester John of the Indies (Cambridge: Hakluyt Society, 1961). Ginzel, Friedrich Karl, "Handbuch der mathematischen und technischen Chronologie", Leipzig, 3 vol., 1906–1914 External links Abushakir (Dart/Flutter & JavaScript) Packages for Ethiopian Calendar, DateTime and Feast/Fasting Tracking Interactive Ethiopian Calendar Ethiopian culture Eritrean culture Liturgical calendar Liturgical calendars Specific calendars Time in Ethiopia Time in Eritrea