# John Charles Duncan

> John Charles Duncan was an American astronomer. His work spanned astronomy's transition from a focus on observation and location measurement to astrophysics. He was well known for his basic college textbook "Astronomy", in widespread use for 30 years after its first publication in 1926. His career was a fruitful combination of research and teaching at major observatories, in his own classrooms and through his textbook. Duncan was the first to note the expansion of the Crab Nebula and from that determine the approximate year of its creation, discovered variable stars in what were soon found to be distant galaxies, and describe the nebular structures now known as the Pillars of Creation.

*American astronomer (1882-1967)*

**Canonical URL:** https://fame.am/person/john-charles-duncan

## Identity
- **Profile type:** Scientist ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Scientists
- **Country:** United States
- **Born:** 1882-02-08
- **Died:** 1967-09-10
- **Status:** deceased
- **Gender:** male

## Bio

John Charles Duncan was an American astronomer. His work spanned astronomy's transition from a focus on observation and location measurement to astrophysics. He was well known for his basic college textbook "Astronomy", in widespread use for 30 years after its first publication in 1926. His career was a fruitful combination of research and teaching at major observatories, in his own classrooms and through his textbook. Duncan was the first to note the expansion of the Crab Nebula and from that determine the approximate year of its creation, discovered variable stars in what were soon found to be distant galaxies, and describe the nebular structures now known as the Pillars of Creation.

## Fame
- **Popularity score:** 38.5 / 100
- **Momentum:** 0.0 / 100  (trend: FALLING)
- **Historical depth:** 4.1 / 100
- **Attention shift:** 0.0 / 100
- **Source confidence:** 25.0 / 100
- **Profile completeness:** 70.0 / 100

## Sources
- [John Charles Duncan](https://en.wikipedia.org/wiki/John_Charles_Duncan)
- [John Charles Duncan](https://de.wikipedia.org/wiki/John_Charles_Duncan)
- [John Charles Duncan](https://fr.wikipedia.org/wiki/John_Charles_Duncan)
- [جون تشارلز دونكان](https://ar.wikipedia.org/wiki/%D8%AC%D9%88%D9%86_%D8%AA%D8%B4%D8%A7%D8%B1%D9%84%D8%B2_%D8%AF%D9%88%D9%86%D9%83%D8%A7%D9%86)
- [Wikidata](https://www.wikidata.org/wiki/Q3181221)

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