"Leavitt law" meaning in English

{
  "etymology_text": "Discovered in 1908 by Henrietta Swan Leavitt.",
  "forms": [
    {
      "form": "the Leavitt law",
      "tags": [
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      "expansion": "the Leavitt law",
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  "lang_code": "en",
  "pos": "name",
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          "name": "Astronomy",
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      ],
      "glosses": [
        "The relationship of direct proportionality between the luminosity of pulsating variable stars and their pulsation periods."
      ],
      "id": "en-Leavitt_law-en-name-fiv14Jxi",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "relationship",
          "relationship"
        ],
        [
          "direct",
          "direct"
        ],
        [
          "proportionality",
          "proportionality"
        ],
        [
          "luminosity",
          "luminosity"
        ],
        [
          "variable star",
          "variable star"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The relationship of direct proportionality between the luminosity of pulsating variable stars and their pulsation periods."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "Henrietta Swan Leavitt"
      ]
    }
  ],
  "word": "Leavitt law"
}

{
  "etymology_text": "Discovered in 1908 by Henrietta Swan Leavitt.",
  "forms": [
    {
      "form": "the Leavitt law",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1"
      },
      "expansion": "the Leavitt law",
      "name": "en-prop"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "en:Astronomy"
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      "glosses": [
        "The relationship of direct proportionality between the luminosity of pulsating variable stars and their pulsation periods."
      ],
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        [
          "astronomy",
          "astronomy"
        ],
        [
          "relationship",
          "relationship"
        ],
        [
          "direct",
          "direct"
        ],
        [
          "proportionality",
          "proportionality"
        ],
        [
          "luminosity",
          "luminosity"
        ],
        [
          "variable star",
          "variable star"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The relationship of direct proportionality between the luminosity of pulsating variable stars and their pulsation periods."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "Henrietta Swan Leavitt"
      ]
    }
  ],
  "word": "Leavitt law"
}