"umbra recta" meaning in English

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  "etymology_text": "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.",
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      "expansion": "umbra recta",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "ref": "1688, John Hales, “The Rich man’s Recepiſti”, in Golden Remains, 3rd edition, page 77:",
          "text": "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.",
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      "glosses": [
        "On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle."
      ],
      "id": "en-umbra_recta-en-noun-1VX40Mvq",
      "links": [
        [
          "right triangle",
          "right triangle"
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      "synonyms": [
        {
          "word": "umbra extensa"
        }
      ]
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  ],
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      "enpr": "ŭmʹbrə rĕkʹtə",
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      "ipa": "/ˈʌmbɹə ˈɹɛktə/",
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        "Received-Pronunciation"
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  "word": "umbra recta"
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    {
      "args": {
        "1": "en",
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  ],
  "etymology_text": "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.",
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  "lang_code": "en",
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          "ref": "1688, John Hales, “The Rich man’s Recepiſti”, in Golden Remains, 3rd edition, page 77:",
          "text": "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.",
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      ],
      "glosses": [
        "On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle."
      ],
      "links": [
        [
          "right triangle",
          "right triangle"
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      ]
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  ],
  "sounds": [
    {
      "enpr": "ŭmʹbrə rĕkʹtə",
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  "synonyms": [
    {
      "word": "umbra extensa"
    }
  ],
  "word": "umbra recta"
}