"apparent brightness" meaning in English

{
  "forms": [
    {
      "form": "apparent brightnesses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "apparent brightness (countable and uncountable, plural apparent brightnesses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Portuguese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Coordinate term: intrinsic brightness"
        }
      ],
      "glosses": [
        "The brightness of a star as measured by an observer."
      ],
      "id": "en-apparent_brightness-en-noun-CXFckwwh",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "brightness",
          "brightness"
        ],
        [
          "observer",
          "observer"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The brightness of a star as measured by an observer."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "brightness of star",
          "word": "näennäinen kirkkaus"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "brightness of star",
          "tags": [
            "masculine"
          ],
          "word": "brilho aparente"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "vídimyj blesk",
          "sense": "brightness of star",
          "tags": [
            "masculine"
          ],
          "word": "ви́димый блеск"
        }
      ],
      "wikipedia": [
        "apparent brightness"
      ]
    }
  ],
  "word": "apparent brightness"
}

{
  "forms": [
    {
      "form": "apparent brightnesses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "apparent brightness (countable and uncountable, plural apparent brightnesses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Portuguese translations",
        "Terms with Russian translations",
        "en:Astronomy"
      ],
      "examples": [
        {
          "text": "Coordinate term: intrinsic brightness"
        }
      ],
      "glosses": [
        "The brightness of a star as measured by an observer."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "brightness",
          "brightness"
        ],
        [
          "observer",
          "observer"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The brightness of a star as measured by an observer."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "apparent brightness"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "brightness of star",
      "word": "näennäinen kirkkaus"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "brightness of star",
      "tags": [
        "masculine"
      ],
      "word": "brilho aparente"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "vídimyj blesk",
      "sense": "brightness of star",
      "tags": [
        "masculine"
      ],
      "word": "ви́димый блеск"
    }
  ],
  "word": "apparent brightness"
}