Robertus Anglicus or Robert the Englishman was an English astronomer of the thirteenth century. He taught at the University of Montpellier, and possibly also at Paris.http://www.textmanuscripts.com/home/archives/archivesdescription.php?m=189 He is known as the author of a 1271 commentary on the De Sphera Mundi of Johannes de Sacrobosco. It includes a significant reference to the state of the art in the technology of clockwork.Timeline - Clocks
He is also the author of the paper (or parchment) "Astrolabii Canones", which provided important principles for measurement on spheres.
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