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  2. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    It is a solar calendar and is the one Iranian calendar that is the most similar to the Gregorian calendar, being based on the Earth's orbit around the Sun. It begins on the March equinox as determined by the astronomical calculation for the Iran Standard Time meridian (52.5°E, UTC+03:30 ) and has years of 365 or 366 days.

  3. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...

  4. Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Islamic_calendar

    Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar, also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.

  5. Iranian calendars - Wikipedia

    en.wikipedia.org/wiki/Iranian_calendars

    The modern Iranian calendar is currently the official civil calendar in Iran. The Iranian New Year begins at the midnight nearest to the instant of the northern spring equinox, as determined by astronomic calculations for the meridian (52.5°E). It is, therefore, an observation-based calendar, unlike the Gregorian, which is rule-based. [1]

  6. List of Islamic years - Wikipedia

    en.wikipedia.org/wiki/List_of_Islamic_years

    This is a list of Hijri years (Latin: anno Hegirae or AH) with the corresponding common era years where applicable. For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given.

  7. Tabular Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Tabular_Islamic_calendar

    Though less accurate than the tabular calendars based on a 30-year cycle, it was popular due to the fact that in each cycle the weekdays fall on the same calendar date. In other words, the 8-year cycle is exactly 405 weeks long, resulting in a mean of exactly 4.21875 weeks per month.

  8. Template:Ab urbe condita date - Wikipedia

    en.wikipedia.org/wiki/Template:Ab_urbe_condita_date

    alone: Display only the number of years and the calendar era according to the |main= parameter : E.g.: "AUC 964" number: Display only a natural number without any era: If |1= is a Gregorian year, the number returned equals the value of that year in the astronomical calendar plus 753; if |1= is an year Ab Urbe Condita, the number returned equals exactly the value of that year in the ...

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.