- Rumi calendar
The Rumi calendar ( _tr. Rumi takvim), a specific calendar based on the
Julian calendarbut starting with the year of Muhammad's emigration (Hijra) in 622 AD, was officially used by the Ottoman Empireafter Tanzimat(1839) and by its successor, the Republic of Turkeyuntil 1926. It was adopted for civic matters and is a solar based calendar, assigning a date to each solar day.
Islamic state of Ottoman Empire, the religious Islamic calendarwas in use, of which days are numbered within each lunar phasecycle. Because the length of the lunar monthis not an even fraction of the length of the tropical year, a purely lunar calendarquickly drifts against the seasons.
In 1677, Head treasurer ( _tr. Baş defterdar) Hasan Pasha of Sultan
Mehmed IVproposed the correction of financial records by dropping one year (escape year)every 33 years resulting from the difference between the lunar Islamic calendar and the solar Julian calendar.cite web |url=http://www.takvim.com/takvim_donusum.php |title=Tkvimler ve Birbirlerine Dönüşümleri - Rumi Takvim |work=Takvim.com |language=Turkish |accessdate=2008-06-14 ]
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 Muharramfollowing 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.
The Julian calendar, used from 1677
ADon for fiscal matters only, was adopted on March 13, 1840AD (March 1, 1256 AH), in the frame of Tanzimat reforms shortly after the ascension 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 Meccato Medina, the same event that also Islamic calendar started. The months and days of the Julian calendar were used, the year starting in March. [cite web |url=http://www.zum.de/whkmla/region/asmin/ottemp18391861.html |work=World History at KMLA |title=History of the Ottoman Empire - The Ottoman Empire 1839-1861 |accessdate=2008-06-14 ] However, in 1256 AH the difference between the Hijri and the Gregorian calendars amounted 584 years. With the switching over from lunar calendar to solar calendar, the difference between the Rumi calendar and the Gregorian calendar remained constant 584 years.
In order to facilitate easy conversion, the difference of thirteen days between the Rumi calendar and the
Gregorian calendarwas eliminated in February 1917. The Julian calendar was abandoned on February 16, 1332 AH, leaving the difference of 584 years unchanged, however. Thus, February 16, 1332 AH (February 1917 AD) suddenly became March 1, 1333 AH ( March 1, 1917AD) and the year 1333 AH (1917 AD) was made into a year with only ten months, running from March 1 to December 31. January 1, 1334 AH thus became January 1, 1918AD. [cite web |url=http://www.tallarmeniantale.com/dadrian-andonian.htm |work=Tall Armenian Tale |title=The Other Side of the Falsified Genocide - Vahakn Dadrian’s Greatest Embarrassment |accessdate=2008-06-14 ]
The Rumi calendar remained in use until the dissolution of the Ottoman Empire and in the first years of the succeeding Republic of Turkey as well. It was abandoned by an act on
December 26, 1341 AH (1925 AD) as part of Atatürk's reformsand was replaced by the Gregorian calendar. [cite web |url=http://www.tosyateml.k12.tr/gunun_onemi.asp?gunun_onemi_icerik=173 |work=T.C. Milli Eğitim Bakanlığı-Kastamonu İli-Tosya Anadolu Teknil Lisesi, Teknik Lise ve Endüstri Meslek Lisesi |title=Saat ve Takvimin Kabulü (26.12.1925) |accessdate=2008-06-14 |language=Turkish ] The Ottoman languagenames of the four months of the Rumi calendar, taken over to the Turkish Gregorian calendar, Teşrin-i Evvel, Teşrin-i Sânî, Kânûn-ı Evvel and Kânûn-ı Sânî, were changed on January 10, 1945to Turkish languageones, Ekim, Kasım, Aralık and Ocak. March 1 as the beginning of the fiscal year was used until 1981.
In the Ottoman Empire, the lunar-based
Hijri calendarremained in use for religious matters alongside the Rumi calendar. In order to prevent confusion between the dates, both calendars were used on most documents.
Conversion between the Rumi and Gregorian calendars
By the date conversion between the two calendars, following periods have to be taken in consideration:
March 13, 1840AD :No conversion is possible, since Rumi calendar was not in use.
March 13, 1840AD (March 1, 1256 AH) and February 28, 1917AD (February 15, 1333 AH):Add 13 days and 584 years to find Gregorian date.
March 1, 1917AD (March 1, 1333 AH):Add 584 years only.
;From Rumi calendar into Gregorian calendar:
31 March Incidentoccurred on March 31, 1325 AH Adding 13 days to date and 584 to year: April 13, 1909AD
;From Gregorian calendar into Rumi calendar:Proclamation of the republic in Turkey on
October 29, 1923AD Subract 584 from year. Date remains same after January 1, 1918 due to use of the Gregorian calendar in the Rumi calendar: October 29, 1339 AH
* [http://www.lib.umich.edu/area/Near.East/computus.html Computus Calendar Conversion Program]
List of calendars
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