Charles Greeley Abbot (May 31, 1872 – December 17, 1973) was an American astrophysicist and also the fifth secretary of the Smithsonian Institution, serving from 1928 until 1944. Abbot went from being director of the Smithsonian Astrophysical Observatory, to becoming Assistant Secretary, and then Secretary of the Smithsonian Institution over the course of his career. As an astrophysicist, he researched the solar constant, research that led him to invent the solar cooker, solar boiler, solar still, and other patented solar energy inventions.
Early life and education
thumb|left|Abbot, at age eleven, with the [[water wheel he invented.]]
Charles Greeley Abbot was born in Wilton, New Hampshire. As a youth he built and invented numerous things, such as a forge to fix tools, a water wheel to power a saw, and a bicycle. He dropped out of school when he was 13 to become a carpenter. Two years later he went back to high school. During his time in Boston, Abbot met Samuel P. Langley on the MIT campus when Langley visited seeking an assistant.
Smithsonian Astrophysical Observatory
thumb|Charles Greeley Abbot, between 1913 and 1917
While at the Smithsonian Astrophysical Observatory (SAO), Abbot would work under Samuel P. Langley. Langley would go on to change his focus from solar radiation to aeronautics, with Abbot taking over solar radiation research. Abbot would participate in many expeditions. In 1900 he, along with Langley, would travel to Wadesboro, North Carolina to observe a solar eclipse, followed by another eclipse expedition to Sumatra in 1901. During his expedition experiences he would also travel to Algeria, Egypt, South Africa, Australia, and other countries, often in partnership with the National Geographic Society. Abbot would become acting director of SAO in 1906 As Director, a position he would hold until his retirement, Abbot would open the Radiation Biology Laboratory in 1929, to study radiation effects on plants, and other organisms. This helped to develop the first wave of biophysics researchers in the United States. In his role as Assistant Secretary he would oversee the Smithsonian Institution Libraries, the International Exchange Service, and the SAO. In the 1930s an expansion was approved for the National Museum of Natural History building, which would not begin until the 1960s. The Institute for Social Anthropology was also transferred to the Smithsonian during this time. The first Smithsonian holiday party would be held during his tenure. At the party, Abbot sang and played the cello for the partygoers. While in Washington, he was a deacon at the First Congregational Church. He also played tennis frequently at the former tennis courts at the Smithsonian Castle. the United States National Academy of Sciences, and the American Academy of Arts and Sciences. On May 31, 1955, the Smithsonian held a birthday party for Abbot, marking his 83rd birthday and his 60th year of association with the Smithsonian. The event was held at the Smithsonian Castle and a bronze bust of Abbot, by Alicia Neatherly, was presented, and donated to the National Gallery of Art. Charles Greeley Abbot died, at age 101 in Maryland, on December 17, 1973. The American Solar Energy Society has an award named in Abbot's honor, which is awarded for contributions to solar energy research.
The Abbot crater on the Moon has been named after him.
Research work
thumb|right|Abbot's [[solar cooker at Mount Wilson Observatory.]]
Abbot began his astrophysics research focusing on solar radiation before proceeding to chart cyclic patterns found in solar variations. With this research he hoped to track solar constant in order to make weather pattern predictions. he invented the solar cooker, which was first built at Mount Wilson Observatory, the solar boiler,