Author: Ed Hitchcock
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Astrolabes, sextants, quadrants, and other practical tools that use principles of astronomy for telling time and navigating. See also: http://catalogue.museogalileo.it/multimedia/AstronomicalUsePlaneAstrolabe.html http://catalogue.museogalileo.it/multimedia/OctantSextant.html http://www.youtube.com/watch?v=yioZhHe1i5M and http://www.ted.com/talks/tom_wujec_demos_the_13th_century_astrolabe