Angelo Secchi

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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 It might be outdated or ideologically biased.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.
References in periodicals archive ?
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But Worm and colleagues used a low-tech technology, disks devised by Vatican scientist Pietro Angelo Secchi, in the 19th century.
Angelo Secchi, the Jesuit researcher who was the first to classify stars by their spectra.
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The first to point this out was an Italian astronomer, Pietro Angelo Secchi (1818-1878), who in 1867 had divided stellar spectra into four classes.
In his 1877 book Le Stella, spectroscopy pioneer Father Pietro Angelo Secchi called this ruddy star "La Superba." He described it as "Magnificent ...
Nearly 150 years have now passed since Kirchhoff wrote about the Sun [1] and Father Angelo Secchi illustrated chromospheric spicules for the first time [2, p.
One of the first and most enthusiastic astronomers to do so was Father Pietro Angelo Secchi of the Vatican Observatory.