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The Iranian calendars or Iranian chronology are a succession of calendars invented or used for over two millennia in Iran, also known as Persia. One of the longest chronological records in human history, the Iranian calendar has been modified time and again during its history to suit administrative, climatic, and religious purposes. The most influential face in laying the frameworks for the calendar and its precision was the 11 century Persian polymath, hakim Omar Khayyam. The modern Iranian calendar is currently the official calendar in Iran. It begins at the midnight nearest to the instant of the vernal equinox as determined by astronomic calculations for the Iran Standard Time meridian. It is, therefore, an observation-based calendar, unlike the Gregorian, which is rule-based.
The heliacal rising or star rise of a star occurs annually, or the similar phenomenon of a planet, when it first becomes visible above the eastern horizon at dawn just before sunrise, after it has spent a season behind the sun rendering it invisible. Historically, the most important such rising is that of Sirius, which was an important feature of the Egyptian calendar and astronomical development. The rising of the Pleiades heralded the start of the Ancient Greek sailing season, using celestial navigation.
The ancient Egyptian calendar – a civil calendar – was a solar calendar with a 365-day year. The year consisted of three seasons of 120 days each, plus an intercalary month of five epagomenal days treated as outside of the year proper. Each season was divided into four months of 30 days. These twelve months were initially numbered within each season but came to also be known by the names of their principal festivals. Each month was divided into three 10-day periods known as decans or decades. It has been suggested that during the Nineteenth Dynasty and the Twentieth Dynasty the last two days of each decan were usually treated as a kind of weekend for the royal craftsmen, with royal artisans free from work.
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The Xia–Shang–Zhou Chronology Project was a multi-disciplinary project commissioned by the People's Republic of China in 1996 to determine with accuracy the location and time frame of the Xia, Shang, and Zhou dynasties.
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The Mysterious Numbers of the Hebrew Kings (1951) is a reconstruction of the chronology of the kingdoms of Israel and Judah by Edwin R. Thiele. The book was originally his doctoral dissertation and is widely regarded as the definitive work on the chronology of Hebrew Kings. The book is considered the classic and comprehensive work in reckoning the accession of kings, calendars, and co-regencies, based on biblical and extra-biblical sources.
The chronology of the ancient Near East is a framework of dates for various events, rulers and dynasties. Historical inscriptions and texts customarily record events in terms of a succession of officials or rulers: "in the year X of king Y". Comparing many records pieces together a relative chronology relating dates in cities over a wide area. For the first millennium BC, the relative chronology can be matched to actual calendar years by identifying significant astronomical events. An inscription from the tenth year of Assyrian king Ashur-Dan III refers to an eclipse of the sun, and astronomical calculations among the range of plausible years date the eclipse to 15 June 763 BC. This can be corroborated by other mentions of astronomical events, and a secure absolute chronology established, tying the relative chronologies to the now-dominant Gregorian calendar.
The Somali calendar is based on both the solar and lunar calendar systems. The calendar was used by farmers and herders to determine the weather and seasons, it helped them in their needs. The Somali solar calendar is known as Amin-tiris or Shin-tiris while the lunar calendar was known as Dayax-tiriska.
References
- ↑ Set forth in "Excursus C: The Twelfth dynasty" in his The Calendars of ancient Egypt (Chicago: University Press, 1950).
- ↑ One example is Patrick O'Mara, "Censorinus, the Sothic Cycle, and calendar year one in ancient Egypt: the Epistological problem", Journal of Near Eastern studies, 62 (2003), pp. 17-26.
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