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This dating system is used in the Muslim world (except Turkey, which uses the Gregorian calendar) and based on a year of 12 months, each month beginning approximately at the time of the New Moon.(The Iranian calendar, however, is based on a solar year.) The Islamic calendar is tied to the lunar phase cycle, with each month alternatively having either 29 or 30 days, except for the 12th, Dhu al-Hijjah, the length of which is varied in a 30-year cycle intended to keep the calendar in step with the true phases of the Moon.This entry contributed by Dana Romero The Islamic calendar has its starting point at the date of the flight of Mohammed from Mecca to Medina, known as the Hejira.

However, this would mean that the approximate 33 years commonly associated with the life of Jesus would not be included in either of the BC and the AD time scales.

Terminology that is viewed by some as being more neutral and inclusive of non-Christian people is to call this the Current or Common Era (abbreviated as CE), with the preceding years referred to as Before the Common or Current Era (BCE).

it is based on the fact that changes in the earth's magnetic field over time can be recorded as remnant magnetism in materials such as baked clay structure (ovens, kilns, and hearths).

archaeozoology: sometimes referred to as zooarchaeology, this involves the identification and analysis of faunal species from archaeological sites, as an aid to the reconstruction of human diets and to an understanding of the contemporary environment at the time of deposition.

carbon samples, soil samples, palynological samples etc.

anthropology: the study of humanity - our physical characteristics as animals, and our unique non-biological characteristics we call culture.

The subject is generally broken down into three subdisciplines: biological (physical) anthropology, cultural (social) anthropology, and archaeology.

archaeological culture: a constantly recurring assemblage of artifacts assumed to be representative of a particular set of behavioral activities carried out at a particular time and place (cf. archaeomagnetic dating: sometimes referred to as paleomagnetic dating.

In Western and Indian astrology, the zodiac circle is divided into 12 equal zodiac signs. Ancient astrologers used two coordinate systems to define the zodiac sign starting point: 1.

Tropical zodiac coordinate system is used in Western astrology.

As you can see, the sidereal zodiac coordinate system is a fixed coordinate system.