"first light" meaning in English

{
  "forms": [
    {
      "form": "firstlight",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "first light (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "76 24",
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "_dis": "91 9",
          "kind": "other",
          "langcode": "en",
          "name": "Times of day",
          "orig": "en:Times of day",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "The time when light first appears in the morning; dawn, especially the start of dawn."
      ],
      "id": "en-first_light-en-noun-Dc4b9HqJ",
      "links": [
        [
          "dawn",
          "dawn"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "69 31",
          "word": "break of day"
        },
        {
          "_dis1": "69 31",
          "word": "daybreak"
        },
        {
          "_dis1": "69 31",
          "word": "dayspring"
        },
        {
          "_dis1": "69 31",
          "word": "dawn"
        },
        {
          "_dis1": "69 31",
          "word": "cockcrow"
        }
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The first use of a telescope or other instrument to capture an astronomical image."
      ],
      "id": "en-first_light-en-noun-8qNrOILy",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "telescope",
          "telescope"
        ],
        [
          "instrument",
          "instrument"
        ],
        [
          "astronomical",
          "astronomical"
        ],
        [
          "image",
          "image"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The first use of a telescope or other instrument to capture an astronomical image."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "wikipedia": [
    "first light (astronomy)"
  ],
  "word": "first light"
}

{
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    "en:Times of day"
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  "forms": [
    {
      "form": "firstlight",
      "tags": [
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      },
      "expansion": "first light (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "The time when light first appears in the morning; dawn, especially the start of dawn."
      ],
      "links": [
        [
          "dawn",
          "dawn"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [
        "en:Astronomy"
      ],
      "glosses": [
        "The first use of a telescope or other instrument to capture an astronomical image."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "telescope",
          "telescope"
        ],
        [
          "instrument",
          "instrument"
        ],
        [
          "astronomical",
          "astronomical"
        ],
        [
          "image",
          "image"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The first use of a telescope or other instrument to capture an astronomical image."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "break of day"
    },
    {
      "word": "daybreak"
    },
    {
      "word": "dayspring"
    },
    {
      "word": "dawn"
    },
    {
      "word": "cockcrow"
    }
  ],
  "wikipedia": [
    "first light (astronomy)"
  ],
  "word": "first light"
}