Adriaan van Maanen
Adriaan van Maanen was born on March 31, 1884. See ranking, bio blurb, and everyone else born that day.
About Adriaan van Maanen
Adriaan van Maanen (March 31, 1884 – January 26, 1946) was a Dutch-American astronomer. Born in Friesland, he studied astronomy at the University of Utrecht, earning his Ph.D. in 1911, and worked briefly at the University of Groningen. In 1911, he came to the United States to work as a volunteer in an unpaid capacity at Yerkes Observatory. Within a year he got a position at the Mount Wilson Observatory, where he remained active until his death in 1946. Van Maanen claimed that his astrometric measurements of spiral nebulae revealed detectable internal motions, supporting the idea that these…