# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/johannes-franz-hartmann
# Generated: 2026-08-15T22:52:16.281Z

schema: https://schema.org/Person
url: "https://fame.am/person/johannes-franz-hartmann"
name: "Johannes Franz Hartmann"
slug: "johannes-franz-hartmann"
description: "Johannes Franz Hartmann was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium."
tagline: "German astronomer (1865–1936)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Johannes_Franz_Hartmann.jpg?width=1200"
gender: "male"
country:
  name: "Germany"
  isoCode: "DE"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1865-01-11"
deathDate: "1936-09-13"
livingStatus: "DECEASED"
scores:
  popularity:           50.18
  momentum:             1.216216216216216
  historical:           20.14330533333334
  currentAttention:     0
  sourceConfidence:     60
  profileCompleteness:  70
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
sources:
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    title: "Johannes Franz Hartmann"
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    title: "Johannes Franz Hartmann"
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    title: "Johannes Franz Hartmann"
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    title: "Johannes Franz Hartmann"
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  - url: "https://es.wikipedia.org/wiki/Johannes_Franz_Hartmann"
    title: "Johannes Franz Hartmann"
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  - url: "https://eu.wikipedia.org/wiki/Juan_Hartmann"
    title: "Juan Hartmann"
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    title: "Johannes Franz Hartmann"
    type:  "WIKIPEDIA"
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    title: "ヨハネス・ハルトマン"
    type:  "WIKIPEDIA"
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    title: "Johannes Franz Hartmann"
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    title: "Johannes Franz Hartmann"
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    title: "Johannes Franz Hartmann"
    type:  "WIKIPEDIA"
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    title: "Johannes Franz Hartmann"
    type:  "WIKIPEDIA"
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    title: "Хартман, Йоханнес Франц"
    type:  "WIKIPEDIA"
  - url: "https://sv.wikipedia.org/wiki/Johannes_Franz_Hartmann"
    title: "Johannes Franz Hartmann"
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  - url: "https://uk.wikipedia.org/wiki/%D0%99%D0%BE%D0%B3%D0%B0%D0%BD%D0%BD%D0%B5%D1%81_%D0%A4%D1%80%D0%B0%D0%BD%D1%86_%D0%93%D0%B0%D1%80%D1%82%D0%BC%D0%B0%D0%BD"
    title: "Йоганнес Франц Гартман"
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  - url: "https://www.wikidata.org/wiki/Q61206"
    title: "Wikidata"
    type:  "WIKIDATA"

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