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File:TriquetrumDreistab 00-128px.jpg
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"The triquetrum (derived from the Latin tri- ["three"] and quetrum ["cornered"]) was the medieval name for an ancient astronomical instrument first described by Ptolemy (c. 90–c. 168) in the Almagest (V. 12)" (Source: Wikipedia, https://en.wikipedia.org/wiki/Triquetrum_%28astronomy%29) Pictured is the Triquetrum of Copernicus from Meyers Großes Konversations-Lexikon 6. Auflage 1905–1909.
The source of this image is https://commons.wikimedia.org/wiki/File:Dreistab_00.jpg
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:00, 21 January 2016 | | 128 × 101 (4 KB) | Cxh.eecs.berkeley.edu (Talk | contribs) | "The triquetrum (derived from the Latin tri- ["three"] and quetrum ["cornered"]) was the medieval name for an ancient astronomical instrument first described by Ptolemy (c. 90–c. 168) in the Almagest (V. 12)" (Source: Wikipedia, https://en.wikipedia.org |
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