"limb darkening" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "word": "limb brightening"
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      "glosses": [
        "The optical effect where the edge of the disk of a star appears darker than the center of the disk."
      ],
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      "raw_glosses": [
        "(physics, astronomy) The optical effect where the edge of the disk of a star appears darker than the center of the disk."
      ],
      "related": [
        {
          "english": "gravity brightening",
          "word": "gravity darkening"
        }
      ],
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        "uncountable"
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      "wikipedia": [
        "limb darkening"
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  "word": "limb darkening"
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  "lang_code": "en",
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      "english": "gravity brightening",
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        "The optical effect where the edge of the disk of a star appears darker than the center of the disk."
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        "(physics, astronomy) The optical effect where the edge of the disk of a star appears darker than the center of the disk."
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