umbra recta

English

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.

Pronunciation

(Received Pronunciation) enPR: ŭmʹbrə rĕkʹtə, IPA^(key): /ˈʌmbɹə ˈɹɛktə/

Noun

umbra recta sg

On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle.
- 1688, John Hales, “The Rich man’s Recepiſti” in Golden Remains (3rd ed.), page 77
  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.

Synonyms

umbra extensa

单词	umbra recta
释义	umbra recta English 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. Pronunciation (Received Pronunciation) enPR: ŭmʹbrə rĕkʹtə, IPA^(key): /ˈʌmbɹə ˈɹɛktə/ Noun umbra recta sg On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle. 1688, John Hales, “The Rich man’s Recepiſti” in Golden Remains (3rd ed.), page 77 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. Synonyms umbra extensa
随便看	დრუნჩი დუ̂ეშდიშ დუ̂ეშტიშ დუბლიკატი დუბლინი დუბლიორი დუბლირება დუგლასი დუდი დუდკოჩი დუდუჩავა დუელი დუელისტი დუეტი დუკატი დულჲა დუმილი დუმჭკუ დუნდულოები დუნდულოი დუნე დუნედ დუნია დუჟინი დურბინდები