# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/andre-louis-danjon
# Generated: 2026-08-13T11:45:48.097Z

schema: https://schema.org/Person
url: "https://fame.am/person/andre-louis-danjon"
name: "André-Louis Danjon"
slug: "andre-louis-danjon"
description: "André-Louis Danjon was a French astronomer who served as director of the Observatory of Strasbourg from 1930 to 1945 and of the Paris Observatory from 1945 to 1963. He developed several astronomical instruments to examine the regularity of the rotation of the earth and among his discoveries was an acceleration of the rotation of the Earth during periods of intense solar activity occurring in 11-year cycles correlated with an increase in earthquakes. The Danjon scale is used for measuring the intensity of lunar eclipses. He noted an increase in the number of dark lunar eclipses with solar activity which is termed as the Danjon effect."
tagline: "French astronomer (1890–1967)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Ehpa-11-a_danjon-boyer_(cropped).jpg?width=1200"
gender: "male"
country:
  name: "France"
  isoCode: "FR"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1890-04-06"
deathDate: "1967-04-21"
livingStatus: "DECEASED"
scores:
  popularity:           46.62
  momentum:             0.5714285714285714
  historical:           15.74902933333333
  currentAttention:     0
  sourceConfidence:     60
  profileCompleteness:  70
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://zh.wikipedia.org/wiki/%E5%AE%89%E5%BE%B7%E7%83%88-%E8%B7%AF%E6%98%93%C2%B7%E4%B8%B9%E5%AE%B9"
    title: "安德烈-路易·丹容"
    type:  "WIKIPEDIA"
  - url: "https://ca.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Andr%C3%A9_Danjon"
    title: "André Danjon"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://es.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://fi.wikipedia.org/wiki/Andr%C3%A9_Danjon"
    title: "André Danjon"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Andr%C3%A9_Danjon"
    title: "André Danjon"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://ja.wikipedia.org/wiki/%E3%82%A2%E3%83%B3%E3%83%89%E3%83%AC%E3%83%BB%E3%83%80%E3%83%B3%E3%82%B8%E3%83%A7%E3%83%B3"
    title: "アンドレ・ダンジョン"
    type:  "WIKIPEDIA"
  - url: "https://lb.wikipedia.org/wiki/Andr%C3%A9_Danjon"
    title: "André Danjon"
    type:  "WIKIPEDIA"
  - url: "https://nn.wikipedia.org/wiki/Andr%C3%A9_Louis_Danjon"
    title: "André Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://pl.wikipedia.org/wiki/Andr%C3%A9_Danjon"
    title: "André Danjon"
    type:  "WIKIPEDIA"
  - url: "https://pt.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://ro.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://ru.wikipedia.org/wiki/%D0%94%D0%B0%D0%BD%D0%B6%D0%BE%D0%BD%2C_%D0%90%D0%BD%D0%B4%D1%80%D0%B5"
    title: "Данжон, Андре"
    type:  "WIKIPEDIA"
  - url: "https://sk.wikipedia.org/wiki/Andr%C3%A9_Louis_Danjon"
    title: "André Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://sl.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://sv.wikipedia.org/wiki/Andr%C3%A9-Louis_Danjon"
    title: "André-Louis Danjon"
    type:  "WIKIPEDIA"
  - url: "https://uk.wikipedia.org/wiki/%D0%90%D0%BD%D0%B4%D1%80%D0%B5-%D0%9B%D1%83%D1%97_%D0%94%D0%B0%D0%BD%D0%B6%D0%BE%D0%BD"
    title: "Андре-Луї Данжон"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q305958"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump