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Specola Guestbook: Dec 1, 1911 – Charles G. Abbot

By Br. Robert Macke  |  15 Dec 2019

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This entry is part [part not set] of 100 in the series Specola Guestbook

Since its founding in 1891, many people have passed through the doors of the Vatican Observatory.  A quick perusal of our guestbook reveals several Names, including Popes, nobel laureates, astronauts, actors, and saints.

Today’s guestbook entry is from the first of December, 1911, when Charles G. Abbot made a visit.

Charles Greeley Abbot (1873-1974)

Next to his name, Charles Greeley Abbot (1872-1973) wrote, “Director Astrophysical Observatory, Washington D.C.”

At the time of his visit, he was director of the Smithsonian Astrophysical Observatory (SAO). He was the observatory’s second director, succeeding its founder Samuel Pierpont Langley in 1907. In 1928 he would become the fifth Secretary of the Smithsonian Institution, but also remained director of the SAO until his retirement in 1944.

While director of the SAO, Abbot oversaw the construction of an observatory facility atop Mount Whitney, in California.  His research focused mostly on the Sun and solar radiation.  He participated in several eclipse expeditions.  He carefully measured the quantity and character of solar energy output over time.  He was the first to use automated measurement devices on high-altitude balloons to conduct his studies of solar radiation. He also oversaw the construction of solar observation outposts in several other places around the world.  Later in life, he correlated variation in solar output with climate effects on Earth. His data were critical for the first studies of the greenhouse effect.

Under his tenure as Secretary of the Smithsonian Institution, and despite the effects of the Great Depression, he managed to oversee many improvements to the museum. It was during his tenure that the National Museum of Natural History was constructed, and the Institute for Social Anthropology was acquired and incorporated into the Smithsonian.

He held seventeen patents for inventions related to utilizing solar energy for practical purposes. These include the solar still, the solar cooker, and the solar boiler.

He was also a man of faith. A devoted protestant, he served as a deacon in his church.

There is a crater on the Moon named for him.

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