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Simon of Cluain
The astrolabe: a most learned tool for navigation, the secrets of both equal and unequal time, arcane knowledge of the stars, their positions and movements, foretelling the tides, locating places in the known world.
"But considre wel that I ne usurpe not to hav founden this werk of my lavour or of myn engyn, I n'am but a lewd compilator of the labour of olde astrologiens,, and have it translatid in myn Englissh only for thy doctrine. And with this swerd shal I sleen envie. "Geoffrey Chaucer" The Astrolabe - Bread and Milk for Children, ca 1391