# Jacobus Kapteyn

> Jacobus Cornelius Kapteyn was a Dutch astronomer. He carried out extensive studies of the Milky Way. He found that the apparent movement of stars was not randomly distributed but had two preferential directions: the two star streams. This discovery was later reinterpreted as evidence for galactic rotation. Kapteyn also suggested that these stellar velocities could be used to find the amount of non-luminous matter in the galaxy, which his student, Jan Oort, measured in 1932, referring to it as "invisible matter".

*Dutch astronomer, best known for his extensive studies of the Milky Way and as the first discoverer of evidence for galactic rotation (1851-1922)*

**Canonical URL:** https://fame.am/person/jacobus-kapteyn

## Identity
- **Profile type:** Scientist ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Scientists
- **Born:** 1851-01-19
- **Died:** 1922-06-18
- **Status:** deceased
- **Gender:** male

## Bio

Imported from discovery source: wikidata-dump

## Fame
- **Popularity score:** 50.9 / 100
- **Momentum:** 0.0 / 100  (trend: FALLING)
- **Historical depth:** 21.0 / 100
- **Now attention:** 0.0 / 100
- **Source confidence:** 60.0 / 100
- **Profile completeness:** 60.0 / 100

## Sources
- [Jacobus Kapteyn](https://pl.wikipedia.org/wiki/Jacobus_Kapteyn)
- [ياكوبس كابتين](https://ar.wikipedia.org/wiki/%D9%8A%D8%A7%D9%83%D9%88%D8%A8%D8%B3_%D9%83%D8%A7%D8%A8%D8%AA%D9%8A%D9%86)
- [ياكوبس كابتين](https://arz.wikipedia.org/wiki/%D9%8A%D8%A7%D9%83%D9%88%D8%A8%D8%B3_%D9%83%D8%A7%D8%A8%D8%AA%D9%8A%D9%86)
- [ইয়াকোবুস কাপ্টাইন](https://bn.wikipedia.org/wiki/%E0%A6%87%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%95%E0%A7%8B%E0%A6%AC%E0%A7%81%E0%A6%B8_%E0%A6%95%E0%A6%BE%E0%A6%AA%E0%A7%8D%E0%A6%9F%E0%A6%BE%E0%A6%87%E0%A6%A8)
- [Jacobus Kapteyn](https://ca.wikipedia.org/wiki/Jacobus_Kapteyn)
- [جاکۆبوس کاپتن](https://ckb.wikipedia.org/wiki/%D8%AC%D8%A7%DA%A9%DB%86%D8%A8%D9%88%D8%B3_%DA%A9%D8%A7%D9%BE%D8%AA%D9%86)
- [Jacobus Kapteyn](https://cs.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://da.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus C. Kapteyn](https://de.wikipedia.org/wiki/Jacobus_C._Kapteyn)
- [Γιακόμπους Καπτέυν](https://el.wikipedia.org/wiki/%CE%93%CE%B9%CE%B1%CE%BA%CF%8C%CE%BC%CF%80%CE%BF%CF%85%CF%82_%CE%9A%CE%B1%CF%80%CF%84%CE%AD%CF%85%CE%BD)
- [Jacobus Kapteyn](https://en.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://eo.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://es.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://eu.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://fi.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://fr.wikipedia.org/wiki/Jacobus_Kapteyn)
- [יקובוס קפטיין](https://he.wikipedia.org/wiki/%D7%99%D7%A7%D7%95%D7%91%D7%95%D7%A1_%D7%A7%D7%A4%D7%98%D7%99%D7%99%D7%9F)
- [Jacobus Kapteyn](https://id.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus C. Kapteyn](https://it.wikipedia.org/wiki/Jacobus_C._Kapteyn)
- [ヤコブス・カプタイン](https://ja.wikipedia.org/wiki/%E3%83%A4%E3%82%B3%E3%83%96%E3%82%B9%E3%83%BB%E3%82%AB%E3%83%97%E3%82%BF%E3%82%A4%E3%83%B3)
- [야코뷔스 캅테인](https://ko.wikipedia.org/wiki/%EC%95%BC%EC%BD%94%EB%B7%94%EC%8A%A4_%EC%BA%85%ED%85%8C%EC%9D%B8)
- [Jacobus Kapteyn](https://lb.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Cornelius Kapteyn](https://nl.wikipedia.org/wiki/Jacobus_Cornelius_Kapteyn)
- [Jacobus Kapteyn](https://nn.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Jacobus Kapteyn](https://no.wikipedia.org/wiki/Jacobus_Kapteyn)
- [Wikidata](https://www.wikidata.org/wiki/Q156892)

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