Abu Jafar Muhammad ibn al-Hasan Al-Khazini (900 - 971), was a Persian astronomer and mathematician from Khorasan. Events Persian scientist, Rhazes, distinguished smallpox from measles in the course of his writings. ... Events Births Deaths Culen of Scotland Categories: 971 ... Khorasan (also spelled Khurasan and Khorassan; خراسان in Persian) is an area, located in eastern and northeastern Iran. ...

He worked on both astronomy and number theory. In ancient Greece and other early civilizations, astronomy consisted largely of astrometry, measuring positions of stars and planets in the sky. ... Traditionally, number theory is that branch of pure mathematics concerned with the properties of integers. ...

Khazini was one of the scientists brought to the court in Ray, Iran by the ruler of the Buyid dynasty, Adhad ad-Dowleh, who ruled from 949 to 983 AD. In 959/960 Khazini was required by the Vizier of Ray, who was appointed by Adhad ad-Dowleh, to measure the obliquity of the ecliptic. Ray, is an old city of Iran. ... The Buwayhids were a Shiite Muslim tribal confederation from the southern shore of the Caspian Sea. ... The plane of the Ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ...

One of al-Khazin's works Zij al-Safa'ih ("Tables of the disks of the astrolabe") was described by his successors as the best work in the field and they make many a reference to it. The work describes some astronomical instruments, in particular it describes an astrolabe fitted with plates inscribed with tables and a commentary on the use of these. A copy of this instrument was made but vanished in Germany at the time of World War II. A photograph of this copy was taken and examined in D.A. King's New light on the Zij al-Safa'ih of Abu Ja'far al-Khazin, Centaurus 23 (2) (1979/80), 105-117. World War II was a truly global conflict with many facets: immense human suffering, fierce indoctrinations, and the use of new, extremely devastating weapons like the atom bomb World War II, also known as the Second World War, was by far the bloodiest, most expensive, and most significant war in...

Khazeni also wrote a commentary on Ptolemy's Almagest in which he gives 19 propositions relating to statements by Ptolemy. He also proposed a different solar model from that of Ptolemy. Claudius Ptolemaeus, given contemporary German styling, in a 16th century engraved book frontispiece . Claudius Ptolemaeus (Greek: Κλαύδιος Πτολεμαῖος; ca. ... Almagest is Latin form of the Arabic name (al-kitabu-l-mijisti, i. ...

See also

• List of Iranian scientists

Photo taken from medieval manuscript by Qotbeddin Shirazi. ...

External sources

• Khazeni's Biography at St Andrew's School of Mathematics, Scotland.