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The Great Contribution of Islamic Astronomers

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Bianca
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« Reply #15 on: August 27, 2007, 06:17:28 pm »



                                                 A S T R O L A B E S






Brass astrolabe




FOR HISTORY OF ASTROLABE SEE:

http://atlantisonline.smfforfree2.com/index.php/topic,2764.0.html



Brass astrolabes were developed in much of the Islamic world, chiefly as an aid to finding the qibla. The earliest known example is dated 315 (in the Islamic calendar, corresponding to 927-8CE).

The first person credited for building the Astrolabe in the Islamic world is reportedly Fazari (Richard Nelson Frye: Golden Age of Persia. p163). He only improved it though, the Greeks had already invented astrolabes to chart the stars. The Arabs then took it during the Abbasid Dynasty and perfected it to be used to find the beginning of Ramadan, the hours of prayer, and the direction of Mecca.






Saphaea



SEE:

http://atlantisonline.smfforfree2.com/index.php/topic,2764.0.html

The instruments were used to read the rise of the time of rise of the Sun and fixed stars. Arzachel (Al-Zarqali) of Al-Andalus constructed one such instrument in which, unlike its predecessors, did not depend on the latitude of the observer, and could be used anywhere. This instrument became known in Europe as the Saphaea.




Mechanical astrolabe

Mechanical astrolabes were developed in the Muslim world, and were perfected by Ibn Samh. These can be considered as an ancestor of the mechanical clocks developed by later Muslim engineers.[44]




Orthographical astrolabe

Abu Rayhan al-Biruni invented and wrote the earliest treatise on the orthographical astrolabe in the 1000s.[17]



 Linear astrolabe

A famous work by Sharaf al-Dīn al-Tūsī is one in which he describes the linear astrolabe, sometimes called the "staff of al-Tusi", which he invented.
« Last Edit: August 28, 2007, 04:07:43 pm by Bianca2001 » Report Spam   Logged

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