From 1908 onwards, Kapteyn was a part-time Research Associate at the Mount Wilson Observatory near Pasadena, California. Between 1908 and 1914 he spent a few months there every year. His first visit to Mount Wilson, in 1908, coincided with the completion of the 60-inch telescope, the largest in the world at the time. George Hale, the founder of the Observatory, adopted Kapteyn’s Plan of Selected Areas as the main observing program for his new telescope. During his stay in 1910, Kapteyn attended the famous meeting of the Solar Union at Mount Wilson, which linked solar and stellar spectroscopic research, and was a key-note speaker. World War I prevented Kapteyn from making more visits after 1914. In 1911 the Astronomical Laboratory moved into its permanent location.
KeywordsSelected Area Proper Motion Bright Star Carnegie Institution Stellar Spectrum
Chapter 13. Mount Wilson
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