Abstract
Kapteyn had drawn the attention of Simon Newcomb of the US Naval Observatory, who visited him in Groningen and at his second home in Vries. Together with his first PhD student Willem de Sitter (who had worked at the Cape), he commenced the study of the distribution of the colors of stars in different regions of the sky. At that time Kapteyn started to look at patterns of stellar proper motions on the sky, which could be used to estimate distances of stars statistically. In Groningen he was very active in the Physical Sciences Society, which promoted the understanding of scientific progress among a wide audience.
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Notes
- 1.
Osiander supervised the printing of De revolutionibus orbium coelestium by Nicolaus Copernicus (1473–1543) and published this in an unsigned letter preceding the Preface.
- 2.
Hendrikus Frederikus (Hans) van der Kallen was a Dutch writer of detective stories. This quote is from Lijk Halfstok (1948).
- 3.
The exception obtains for the correction of the Auwers /Bradley declinations for the stars between declination + 20∘ and + 40∘.
- 4.
Kostinsky, Pulkovo Obs. Vol. - - -. [Footnote by JCK with his underlining] This is Sergej K. Kostinsky (1867–1936); Pulkovo Observatory is at St. Petersburg, Russia. [PCK]
- 5.
Journ. de Liouville 8 (1843), p. 435. [JCK] Actually this is the ‘Journal de mathématiques pures et appliquées, founded in 1836 by famous mathematician Joseph Liouville (1809–1882). [PCK]
- 6.
Rather the distance corresponding to the mean parallax. [JCK]
- 7.
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Chapter 8. Colors and Motions
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van der Kruit, P.C. (2015). Colors and Motions. In: Jacobus Cornelius Kapteyn. Astrophysics and Space Science Library, vol 416. Springer, Cham. https://doi.org/10.1007/978-3-319-10876-6_8
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