Statistics for occurrence #1 of “Aristarchus” in chapter 4, entry dial of Knight's Mechanical Encyclopedia:

...ovided with a gnomon and divisional markings. The dial in the square court of the Alexandrian Museum was visited by an august procession of philosophers during the seven centuries which separated Aristarchus from Hypatia. On the instrument, which had a plane parallel to the equator and a gnomon parallel to the earth's polar axis, Hipparchus, 150 B. C., learned the length of the year, that the four quar...
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