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In principle, each Islamic month begins with sighting of the new crescent moon (after a New Moon) at sunset. Because of this, the calendar is dependent on observational conditions and cannot be predicted or reconstructed with certainty, but tabular calendars are in use which determine the dates algorithmically. Because of this, dates may vary ...
The Tabular Islamic calendar (Arabic: التقويم الهجري المجدول, romanized: altaqwim alhijriu almujadwal) is a rule-based variation of the Islamic calendar. It has the same numbering of years and months, but the months are determined by arithmetical rules rather than by observation or astronomical calculations.
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
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.
The Hijri year (Arabic: سنة هجرية, romanized: sanat hijriyya) or era (Arabic: التقويم الهجري, romanized: at-taqwīm al-hijrī) is the era used in the Islamic lunar calendar. It begins its count from the Islamic New Year in which Muhammad and his followers migrated from Mecca to Yathrib (now Medina) in 622 CE.
The Arabic names of the months of the Gregorian calendar are usually phonetic Arabic pronunciations of the corresponding month names used in European languages. An exception is the Assyrian calendar used in Iraq and the Levant, whose month names are inherited via Classical Arabic from the Babylonian and Hebrew lunisolar calendars and correspond to roughly the same time of year.
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
The Tabular Islamic calendar, a rule-based variation of the Islamic calendar. It has the same numbering of years and months, but the months are determined by arithmetical rules rather than by observation or astronomical calculations. In Iran The Solar Hijri calendar, whose year begins at the moment of the Spring equinox in the northern hemisphere.