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Dioptra
URL: http://members.tripod.com/Bluestar_4/Dioptra.html
Submitted: Sat Sep 06 2003
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CT: Science: Archaeology: Topics: Archaeoastronomy: Dioptra
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Description:
The earliest dioptra (c.300 BCE) was a device for measuring the angle, in parts of a "Sign", between two celestial objects. Photos and descriptions of how to make one and how they work.