"Eratosthenian" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "Eratosthenian",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The epoch in the lunar geologic timescale that occurred between 3200 million and 1100 million years ago."
      ],
      "id": "en-Eratosthenian-en-name-LOfSzpVk",
      "wikipedia": [
        "Eratosthenian"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌɛɹətəsˈθiːniən/"
    },
    {
      "ipa": "/ɛˌɹætəsˈθiːniən/"
    }
  ],
  "word": "Eratosthenian"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "Eratosthenian",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English 5-syllable words",
        "English entries with incorrect language header",
        "English lemmas",
        "English proper nouns",
        "English terms with IPA pronunciation",
        "English uncountable nouns"
      ],
      "glosses": [
        "The epoch in the lunar geologic timescale that occurred between 3200 million and 1100 million years ago."
      ],
      "wikipedia": [
        "Eratosthenian"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌɛɹətəsˈθiːniən/"
    },
    {
      "ipa": "/ɛˌɹætəsˈθiːniən/"
    }
  ],
  "word": "Eratosthenian"
}