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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 references to it. [2] The work describes some astronomical instruments, in particular an astrolabe fitted with plates inscribed with tables, and a commentary on the use of these.
Al-Khazini was the author of an encyclopedia on scales and water-balances called The Book of the Balance of Wisdom (Kitab Mizan al-Hikmah, 1121), which explored theories of density, specific gravities of metals, precious stones, and liquids, as well as principles of equilibrium.
The 12th-century scholar Al-Khazini suggested that the gravity an object contains varies depending on its distance from the centre of the universe (referring to the centre of the Earth). Al-Biruni and Al-Khazini studied the theory of the centre of gravity, and generalized and applied it to three-dimensional bodies.
In al-Haytham's Book of Optics he argues that the celestial spheres were not made of solid matter, and that the heavens are less dense than air. [17] Some astronomers theorized about gravity too, al-Khazini suggests that the gravity an object contains varies depending on its distance from the center of the universe. The center of the universe ...
In 1121, Al-Khazini, in The Book of the Balance of Wisdom, differentiated between force, mass, and weight is a complete misrepresentation of the original source ( Hill, Donald R. (1993). Islamic Science and Engineering .
The Persian intellectual Al-Biruni believed that the force of gravity was not unique to the Earth, and he correctly assumed that other heavenly bodies should exert a gravitational attraction as well. [17] In contrast, Al-Khazini held the same position as Aristotle that all matter in the Universe is attracted to the center of the Earth. [18]
Al-Isfazārī was a contemporary of the Persian polymath Umar al-Khayyam and the Persian astronomer Al-Khazini. Al-Isfazārī's main surviving work, Irshād dhawī al-cirfān ilā ṣinācat al-qaffān (Guiding the Possessors of Learning in the Art of the Steelyard), sets out the theory of the steelyard balance with unequal arms.
1200 – Abd al-Latif al-Baghdadi observes and examines a large number of skeletons, and he discovered that Galen was incorrect regarding the formation of the bones of the lower jaw and sacrum. 1242 – Ibn al-Nafis carries out autopsies which leads him to the discovery of pulmonary circulation and the circulatory system .