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Gnomon
Part of a sundial that casts a shadow / From Wikipedia, the free encyclopedia
For other uses, see Gnomon (disambiguation).
A gnomon (/ˈnoʊˌmɒn, -mən/; from Ancient Greek γνώμων (gnṓmōn) 'one that knows or examines')[1][2] is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields.
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