Charlotte Sitterly, American astronomer

Charlotte Sitterly, American astronomer

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Caption: Charlotte Sitterly (1898-1990), American astronomer and astrophysicist. Sitterly (nee Moore) carried out extensive work in solar spectroscopy. This lead to the discovery of the presence of technetium in the Sun, the first time it had been observed occurring naturally. She worked with the National Institute of Standards and Technology (NIST) to compile tables of atomic energy levels, which are still used for reference today. In 1949 she became the first woman elected as an associate of the Royal Astronomical Society of Great Britain. She was awarded the Bruce Medal in 1990 for outstanding lifetime contributions to astronomy. Photographed around 1980.

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