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Islamic geographers – Medieval Islam

By |2018-04-18T09:54:08+00:00July 25th, 2017|History, Islam, Science|

al-Idrisi's map of the world (1100s AD) Many people in the Islamic Empire were rich enough to send their sons to college, and so the big university at Alexandria in Egypt stayed open, though it moved to the new town of Cairo. A new university also opened up in Baghdad, near ancient Babylon (modern Iraq), and there were smaller universities in Tunis (in Tunisia [...]

What is an astrolabe? Greek science

By |2018-04-23T14:04:11+00:00July 16th, 2017|Greeks, Science|

An Islamic astrolabe (832 AD) About 140 BC, the Greek astronomer Hipparchus of Rhodes invented the science of trigonometry. Hipparchus figured out that you could use an imaginary right triangle whose corners were the sun, the earth, and the planets or stars, to calculate the movements of the planets and stars. To measure the angles of these right triangles accurately, Hipparchus invented [...]