Charles Dillon Perrine

Charles Dillon Perrine (July 28 1867 – June 21 1951) was an American-Argentine astronomer.

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Born in Ohio, he worked at Lick Observatory from 1893 to 1909 and then was director of the Argentine National Observatory (today, Observatorio Astron?mico de C?rdoba) http://www.oac.uncor.edu/html_eng/histo/histo.htm in Argentina from 1909 until 1936.

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In 1901, he and George Ritchey observed the apparent superluminal motion in the nebulosity surrounding Nova Persei 1901.

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He discovered two moons of Jupiter, today known as Himalia (in 1904) and Elara (in 1905). They were simply designated "Jupiter VI" and "Jupiter VII" and were not given their present names until 1975.

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Co-discovered the lost periodic comet 18D/Perrine-Mrkos and several other comets. Anton?n Mrkos later named the asteroid 6779 Perrine after him.

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He promoted the study of astrophysics in Argentina and pushed for the construction of a large telescope (the Bosque Alegre telescope), which however was not completed until 1942, which was after his retirement in 1936. He remained in Argentina after retirement and died there, in Villa General Mitre (which has since been renamed to its original name of Villa del Totoral). He is buried in the cementerio disidente in the city of C?rdoba.

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July 28: July 28 is the 209th day (210th in leap years) of the year in the Gregorian Calendar, with 156 days remaining....

1867: 1867 was a common year starting on Tuesday (see link for calendar)....

June 21: June 21 is the 172nd day of the year (173rd in leap years) in the Gregorian calendar, with 193 days remaining. This day usually marks the summer solstice in the northern hemisphere and the winter solstice in the southern hemisphere, and thus is the day of the year with the longest hours of daylight ...

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