1876 - Born on the 20th of December in Antioch, Syria.
1885 - He was brought to United States with his missionary parents.
1898 - He graduated from Dartmouth College, then continued his education in Germany.
- He began a career in Astronomy that culminated when he became director of the Mount Wilson
- He was able to demonstrate that spectra could be used to determine whether a star was a giant or
1915 - He began a study of the companion of Sirous and found that despite a size only slightly larger than
- He discovered the strong presence of carbon dioxide in the infrared spectrum of Venus.
1956 - He died on the 11th of May in Pasadena, California.
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