Secchi, Angelo

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Secchi, Angelo


Born June 29, 1818, in Reggio nell’Emilia; died Feb. 26, 1878, in Rome. Italian astronomer.

Secchi became director of the observatory at the Roman College in 1849. He is best known for his investigations of the spectra of stars, the sun, the moon, the planets, and comets. In 1863, Secchi made the first classification of stellar spectra. His division of the spectra into four groups was generally accepted until the introduction of the Harvard classification in the mid-20th century. Secchi was one of the first investigators to apply photography to astronomy. He also worked in the areas of geodesy, meteorology, and hydrology. He developed an instrument—the Secchi disk—for measuring water transparency.


Le Soleil, 2nd ed., parts 1–2. Paris, 1875–77.
Les Étoiles: Essai d’astronomie sidérale, vols. 1–2. Paris, 1880.
In Russian translation:
Edinstvo fizicheskikh sil: Opyt estestvenno-nauchnoi filosofii, 2nd ed. St. Petersburg, 1880.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.