On a shadow in the shape of a right triangle, the length of the shadow's edge opposite to a measured angle.
Related
Similar words
umbra stans
Origin
First attested in Modern English in 1688, although the phrase was also used in Middle English by Geoffrey Chaucer (c. 1343–1400) in his Treatise on the Astrolabe; Latin: umbra + versa (feminine nominative singular of versus, “turned”) = “turned shadow”; compare umbra recta.
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