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Há 2 dias · Abbasid Caliphate. The Abbasid Caliphate or Abbasid Empire ( / əˈbæsɪd, ˈæbəsɪd /; Arabic: الْخِلَافَة الْعَبَّاسِيَّة, romanized : al-Khilāfa al-ʿAbbāsiyya) was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib ...
Há 3 dias · Mathematics in ancient Mesopotamia. Until the 1920s it was commonly supposed that mathematics had its birth among the ancient Greeks. What was known of earlier traditions, such as the Egyptian as represented by the Rhind papyrus (edited for the first time only in 1877), offered at best a meagre precedent.
Há 4 dias · astronomical observatory, any structure containing telescopes and auxiliary instruments with which to observe celestial objects. Observatories can be classified on the basis of the part of the electromagnetic spectrum in which they are designed to observe. The largest number of observatories are optical; i.e., they are equipped to observe in ...
Education - Ancient Societies, Literacy, Pedagogy: The history of civilization started in the Middle East about 3000 bce, whereas the North China civilization began about a millennium and a half later. The Mesopotamian and Egyptian civilizations flourished almost simultaneously during the first civilizational phase (3000–1500 bce). Although these civilizations differed, they shared ...
Há 2 dias · Copernicus's four years at Kraków played an important role in the development of his critical faculties and initiated his analysis of logical contradictions in the two "official" systems of astronomy—Aristotle's theory of homocentric spheres, and Ptolemy's mechanism of eccentrics and epicycles—the surmounting and discarding of which would be the first step toward the creation of ...
Há 2 dias · Indian mathematics emerged in the Indian subcontinent [1] from 1200 BCE [2] until the end of the 18th century. In the classical period of Indian mathematics (400 CE to 1200 CE), important contributions were made by scholars like Aryabhata, Brahmagupta, Bhaskara II, Varāhamihira, and Madhava. The decimal number system in use today [3] was first ...
Há 1 dia · The scientific activity of Gauss, besides pure mathematics, can be roughly divided into three periods: astronomy was the main focus in the first two decades of the 19th century, geodesy in the third decade, and in the fourth decade he occupied himself with physics, mainly magnetism.
