The ''Rumi'' calendar (, , lit. "Roman calendar"), a specific calendar based on the

Julian calendar The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts ...

, was officially used by the

Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...

after

Tanzimat The (, , lit. 'Reorganization') was a period of liberal reforms in the Ottoman Empire that began with the Edict of Gülhane of 1839 and ended with the First Constitutional Era in 1876. Driven by reformist statesmen such as Mustafa Reşid Pash ...

(1839) and by its successor, the

Republic of Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...

until 1926. It was adopted for civic matters and is a solar based calendar, assigning a date to each solar day.

History

In the

Islam Islam is an Abrahamic religions, Abrahamic monotheistic religion based on the Quran, and the teachings of Muhammad. Adherents of Islam are called Muslims, who are estimated to number Islam by country, 2 billion worldwide and are the world ...

ic state of the Ottoman Empire, the religious

Islamic calendar The Hijri calendar (), also known in English as the Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the Ramad ...

lunar calendar A lunar calendar is a calendar based on the monthly cycles of the Moon's phases ( synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar year, and lunisolar calendars, whose lunar months are br ...

) was in use. In this calendar, months coincide with

lunar phase A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth. Because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth. In common usage, the four maj ...

s. Because a "lunar year" (the combined duration of twelve lunar phases) is shorter than the

solar year A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky – as viewed from the Earth or another celestial body of the Solar System – thus completing a full cycle of astronom ...

, the seasons cycle through the lunar months as the solar years pass. "As a result," says the

Astronomical Almanac The ''Astronomical Almanac''The ''Astronomical Almanac'' for the Year 2024, © Crown Copyright 2023, ISSN 0737-6421 . is an almanac published by the United Kingdom Hydrographic Office; it also includes data supplied by many scientists from around ...

, "the cycle of twelve lunar months regresses through the seasons over a period of about 33 [ solar] years".

1677 Introduction of the Fiscal calendar

In 1677, Head Treasurer (, ) Hasan Pasha under Sultan Mehmed IV proposed the correction of financial records by dropping one year (an escape year) every 33 years, resulting from the difference between the lunar Islamic calendar and the solar

. In 1740 (1152 AH) during the reign of Sultan Mahmud I, March was adopted as the first month of the fiscal year for the payment of taxes and dealings with government officials instead of

Muharram Al-Muharram () is the first month of the Islamic calendar. It is one of the four sacred months of the year when warfare is banned. It precedes the month of Safar. The tenth of Muharram is known as Ashura, an important day of commemoration in ...

following Treasurer Atıf Efendi's proposal. Proposed by Treasurer Moralı Osman Efendi during the reign of Sultan Abdul Hamid I, the range of the fiscal calendar applications was extended in 1794 to state expenditures and payments in order to prevent surplus cost arising from the time difference between the Islamic and Julian calendar.

1840 Adoption of the Julian Calendar

The Julian calendar, used from 1677 AD on for fiscal matters only, was adopted on March 13, 1840 AD (March 1, 1256 AH), in the frame of Tanzimat reforms shortly after the accession to the throne of Sultan Abdülmecid I, as the official calendar for all civic matters and named "Rumi calendar" (literally Roman calendar). The counting of years began with the year 622 AD, when Muhammad and his followers emigrated from

Mecca Mecca, officially Makkah al-Mukarramah, is the capital of Mecca Province in the Hejaz region of western Saudi Arabia; it is the Holiest sites in Islam, holiest city in Islam. It is inland from Jeddah on the Red Sea, in a narrow valley above ...

Medina Medina, officially al-Madinah al-Munawwarah (, ), also known as Taybah () and known in pre-Islamic times as Yathrib (), is the capital of Medina Province (Saudi Arabia), Medina Province in the Hejaz region of western Kingdom of Saudi Arabia, ...

, the same event marking the start of the Islamic calendar. The months and days of the Julian calendar were used, the year starting in March. However, in 1256 AH the difference between the Hijri and the Gregorian calendars amounted to 584 years. With the change from lunar calendar to solar calendar, the difference between the Rumi calendar and the Julian or Gregorian calendar remained a constant 584 years.

1917 Adoption of the Gregorian calendar

Since the Julian to Gregorian calendar changeover was finally being adopted in neighboring countries, the Rumi calendar was realigned to the

Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...

in February 1917, leaving the difference of 584 years unchanged, however. Thus, after February 15, 1332 AH (February 1917 AD), the next day instead of being February 16 suddenly became March 1, 1333 AH (March 1, 1917 AD). The year 1333 AH (1917 AD) was made into a year with only ten months, running from March 1 to December 31. January 1, AD 1918 thus became January 1, AH 1334. The Rumi calendar remained in use after the dissolution of the Ottoman Empire into the first years of the succeeding Republic of Turkey.

1925 Discontinuation of the Rumi calendar

The use of the AH era was abandoned as part of

Atatürk's reforms Atatürk's reforms ( or ''Atatürk Devrimleri''), also referred to as the Turkish Revolution (Turkish language, Turkish: ''Türk Devrimi''), were a series of political, legal, religious, cultural, social, and economic policy changes, designed ...

by an act of December 26, 1341 AH (1925 AD) and was replaced by the Gregorian year from 1926.

Calendar months

The names of four months that occur in pairs in the Semitic/Arabic naming system (, and , ) were changed on January 10, 1945 to

Turkish language Turkish ( , , also known as 'Turkish of Turkey') is the most widely spoken of the Turkic languages, a member of Oghuz languages, Oghuz branch with around 90 million speakers. It is the national language of Turkey and one of two official languag ...

names, , , and , for simplicity. From 1918 the fiscal year has commenced on 1 January. The other months' names were from the Syriac language, except for Mart, Mayıs, and Ağustos, which were derived from Latin.

1917 Conversion Table

In 1917 (1332-1333), a major calendar reform aligned the Rumi calendar with the Gregorian calendar. This table, adapted from the work of Richard B. Rose, lists the equivalent dates for that year.

Notes

References

External links

Interconvert Gregorian and Rumi dates
{{DISPLAYTITLE:''Rumi'' calendar Hijrah-based calendars Culture of the Ottoman Empire 1926 disestablishments in Turkey