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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 [...]