Charles Greeley Abbot


Charles Greeley Abbot was the second director of the Smithsonian Astrophysical Observatory and the fifth Secretary of the Smithsonian Institution. He was the second and last person to hold both posts simultaneously and is remembered today for his skill as an instrumentalist and his unshakable belief that the Sun is a variable star and that its variations had a measurable effect on the Earth’s weather. He was elected to the National Academy of Sciences in 1915 and served as its home secretary from 1919 to 1923 under President Charles Doolittle Walcott, who was Abbot’s predecessor as Smithsonian Secretary