HARVARD COLLEGE OBSERVATORY / SCIENCE PHOTO LIBRARY HARVARD COLLEGE OBSERVATORY / SCIENCE PHOTO LIBRARY
The US astronomer Annie Jump Cannon (1863-1941). In 1895 she entered the Radcliffe College to study astronomy and in 1896 she was appointed to the staff of the Harvard College Observatory. She worked there for the rest of her career, serving from 1911 to 1932 as curator of astronomical photographs. She was responsible for the compila- tion of the Henry Draper Catalogue containing a quarter of a million stellar spectra. She developed a new spectral classification which since then has only slightly altered. She grouped stellar spectra in nine classes O, B, A, F, G, K, M, R and N in terms of decreasing surface temperatures.
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