What is the difference between the Ge’ez calendar and the Gregorian calendar?

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CopticBot.ai · Accepted Answer

The Ge’ez calendar has 13 months—12 of 30 days and a final month of 5 or 6 days—while the Gregorian calendar has 12 months of varying lengths. Ge’ez year numbering is 7–8 years behind, its new year begins in September rather than January, and it observes leap years every four years without Gregorian century exceptions.

The Ge’ez (Ethiopian) calendar and the Gregorian calendar differ fundamentally in their origins, mathematical structure, epoch (year numbering), and leap-year calculations. Historically, the Ge’ez calendar is directly derived from the ancient Alexandrian calendar used by the Coptic Church, sharing the exact same structure of months and days. The primary differences between the Ge’ez calendar and the Western Gregorian calendar include: 1. Structure of the Year and Months The Ge’ez Calendar: Like the Coptic calendar, it is a solar calendar divided into 13 months: 12 months of exactly 30 days each. 1 short 13th month at the end of the year, called Pāgwmēn (derived from the Greek loanword ἐπαγόμεναι, epagomenai, meaning "added days"), which has 5 days in a standard year and 6 days in a leap year. Every standard year has 365 days, and every leap year has 366 days. The Gregorian Calendar: It consists of 12 months of irregular lengths ranging from 28 to 31 days (January through December), with an extra day added to February every leap year. 2. Year Count and Epoch (The Era of Calculation) The Ge’ez Calendar: It uses the Era of the Incarnation (Anno Incarnationis), based on the ancient Alexandrian computus calculated by the chronicler Annianus of Alexandria (early 5th century). This calculation places the Annunciation and Nativity of Christ approximately 7 to 8 years later than the Western Dionysian calculation. Consequently, the Ge’ez calendar is 7 years behind the Gregorian calendar from September 11 to December 31, and 8 years behind from January 1 to September 10. The Gregorian Calendar: It uses the Anno Domini (AD) system introduced by Dionysius Exiguus in the 6th century, which became the standard in Western Europe. 3. The Start of the New Year The Ge’ez Calendar: The new year begins on 1 Maskaram (celebrated as Enkutatash), which corresponds exactly to 1 Tout (Feast of Nayrouz) in the Coptic calendar. In the Gregorian calendar, this falls on: September 11 in standard years. September 12 in the year preceding a Gregorian leap year. The Gregorian Calendar: The civil new year begins on January 1. 4. Leap-Year Rules and Drift The Ge’ez Calendar: It follows the Alexandrian/Julian rule: a leap year occurs strictly every 4 years without exception. Every fourth year, the 13th month (Pāgwmēn) has 6 days instead of 5. The Gregorian Calendar: It was instituted in 1582 by Pope Gregory XIII to correct for the slight difference between the solar (tropical) year and the Julian calendar: A year is a leap year if divisible by 4, except for end-of-century years, which must be divisible by 400 (e.g., the year 2000 was a leap year, but 1700, 1800, and 1900 were not). Because the Ge’ez and Coptic systems maintain the strict four-year rule, the Julian/Alexandrian reckoning currently lags behind the Gregorian calendar by 13 days. 5. Liturgical Observance (Feasts and Fasts) Because of the 13-day solar shift between the Julian/Alexandrian system and the Gregorian calendar, fixed feasts in the Ge’ez calendar occur on different Gregorian dates than in the West. For example, the Nativity of Christ (Ganna or Ledet), celebrated on 29 Tāḫśāś (which corresponds to 29 Kiahk in the Coptic Church), falls on January 7 on the Gregorian calendar (or January 8 in leap years), rather than December 25 Gregorian.

What is the difference between the Ge’ez calendar and the Gregorian calendar?

1. Structure of the Year and Months

2. Year Count and Epoch (The Era of Calculation)

3. The Start of the New Year

4. Leap-Year Rules and Drift

5. Liturgical Observance (Feasts and Fasts)

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