Secchi, Pietro Angelo

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Secchi, Pietro Angelo (pyĕ`trō än`jālō sĕk`kē), 1818–78, Italian astronomer, a Jesuit priest. He was director of the observatory of the Gregorian Univ., Rome, from 1849. He is known especially for his work in spectroscopy and was a pioneer in classifying stars by their spectra. In 1860 he made some notable solar-eclipse photographs. His works include a star catalog (1867).

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