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  2. 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] This ...

  3. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    The calendar's epoch (first year) corresponds to the Hijrah in 622 CE, which is the same as the epoch of the Lunar Hijri calendar but as it is a solar calendar, the two calendars' year numbers do not coincide with each other and are slowly drifting apart, being about 43 years apart as of 2023.

  4. Tabular Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Tabular_Islamic_calendar

    (29 days × 6 months + 30 days × 6 months) × 30 years + 11 leap days = 10,631 days and 10,631 / 360 = 29.53056 (360 is number of months in 30 years). And this is approximately how long it takes for the moon to make full lunar cycle. Microsoft's Kuwaiti algorithm is used in Windows to convert between Gregorian calendar dates and Islamic ...

  5. 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 ...

  6. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    The Islamic calendar or Hijri calendar is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to date events in most of the Muslim countries (concurrently with the Gregorian calendar) and used by Muslims everywhere to determine the proper day on which to celebrate Islamic holy days and festivals.

  7. Public holidays in Iran - Wikipedia

    en.wikipedia.org/wiki/Public_holidays_in_Iran

    Iran uses three official calendar systems, including the Solar Hijri calendar as the main and national calendar, the Gregorian calendar for international events and Christian holidays, and the Lunar Hijri calendar for Islamic holidays.

  8. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  9. Hijri year - Wikipedia

    en.wikipedia.org/wiki/Hijri_year

    A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently, its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2025 CE corresponds to the Islamic years AH 1446 – 1447; AH 1446 corresponds to 2024 – 2025 in the Common Era. [a]