umbra recta
noun/ˈʌmbɹə ˈɹɛktə/UK
Etymology
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 (“shadow”) + rēcta (feminine nominative singular of rēctus, “straight”) = “straight shadow”; compare umbra versa.
Definitions
On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to…
On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle.
- Scheubelius a great Mathematician, but by book only, and not by practice who being required ſometime in an Army to make uſe of his Quadrant, knew not the difference between umbra recta, and umbra verſa.
The neighborhood
Vish — recursive loop
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA