"sidereal month" meaning in English

{
  "forms": [
    {
      "form": "sidereal months",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sidereal month (plural sidereal months)",
      "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": "topical",
          "langcode": "en",
          "name": "Moon",
          "orig": "en:Moon",
          "parents": [
            "Celestial bodies",
            "Light",
            "Moons",
            "Nature",
            "Space",
            "Energy",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The time in which the moon passes round the ecliptic to the same star: 27.3217 days."
      ],
      "id": "en-sidereal_month-en-noun-6t4TlwM6",
      "links": [
        [
          "ecliptic",
          "ecliptic"
        ],
        [
          "star",
          "star"
        ]
      ],
      "synonyms": [
        {
          "word": "lunar month"
        },
        {
          "word": "stellar month"
        }
      ]
    }
  ],
  "word": "sidereal month"
}

{
  "forms": [
    {
      "form": "sidereal months",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sidereal month (plural sidereal months)",
      "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",
        "en:Moon",
        "en:Time"
      ],
      "glosses": [
        "The time in which the moon passes round the ecliptic to the same star: 27.3217 days."
      ],
      "links": [
        [
          "ecliptic",
          "ecliptic"
        ],
        [
          "star",
          "star"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "lunar month"
    },
    {
      "word": "stellar month"
    }
  ],
  "word": "sidereal month"
}