"siderisch jaar" meaning in Dutch

{
  "forms": [
    {
      "form": "siderische jaren",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "n",
        "2": "siderische jaren",
        "3": "-"
      },
      "expansion": "siderisch jaar n (plural siderische jaren)",
      "name": "nl-noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Dutch entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Dutch entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "nl",
          "name": "Astronomy",
          "orig": "nl:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "nl",
          "name": "Calendar",
          "orig": "nl:Calendar",
          "parents": [
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "sidereal year"
      ],
      "id": "en-siderisch_jaar-nl-noun-1vR2xLd0",
      "links": [
        [
          "sidereal year",
          "sidereal year"
        ]
      ],
      "tags": [
        "neuter"
      ],
      "wikipedia": [
        "nl:siderisch jaar"
      ]
    }
  ],
  "word": "siderisch jaar"
}

{
  "forms": [
    {
      "form": "siderische jaren",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "n",
        "2": "siderische jaren",
        "3": "-"
      },
      "expansion": "siderisch jaar n (plural siderische jaren)",
      "name": "nl-noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Dutch entries with incorrect language header",
        "Dutch entries with topic categories using raw markup",
        "Dutch lemmas",
        "Dutch multiword terms",
        "Dutch neuter nouns",
        "Dutch nouns",
        "Pages with 1 entry",
        "nl:Astronomy",
        "nl:Calendar"
      ],
      "glosses": [
        "sidereal year"
      ],
      "links": [
        [
          "sidereal year",
          "sidereal year"
        ]
      ],
      "tags": [
        "neuter"
      ],
      "wikipedia": [
        "nl:siderisch jaar"
      ]
    }
  ],
  "word": "siderisch jaar"
}