Angelo Secchi

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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.
References in periodicals archive ?
In 1877, Father Angelo Secchi described the chromosphere in detail including, most notably, a description of its spicules [6, p.
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.
The TNS Romanian office will be based in Bucharest and will be headed up by Angelo Secchi, TNS' Country Manager for Italy and Romania, reporting to the Senior Vice President of TNS' European operation Robert Trehin, with local assistance from Connet-Ro's co-founder Paolo Tamburelli.
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.
On solar granulations, limb darkening, and sunspots: Brief insights in remembrance of Father Angelo Secchi.
However, in 1864, along with Father Angelo Secchi [95, 96], John Herschel became one of the first professional astronomers to advance the concept that the Sun was gaseous when discussing sunspots in April of that year: "while it agrees with that of an aggregation of the luminous matter in masses of some considerable size, and some degree of consistency, suspended or floating at a level determined by their .
3 Angelo Secchi and the partially condensed photosphere
Angelo Secchi [3] first outlined his ideas regarding the physical constitution of the Sun in the Bullettino Meteorologico dell' Osservatorio del Collegio Romano in two 1864 manuscripts [95, 96].
For his part, Father Angelo Secchi [5, 6] promoted the idea that the Sun was a gaseous body with solid or liquid particulate matter floating within its photosphere.
Strangely, if Father Angelo Secchi [2] first advanced that the Sun was constituted of a gaseous body surrounded by a photosphere containing particulate matter [16,17], it was because he was searching to understand photospheric structure.
The discussion then involved George Airy as the Astronomer Royal, Warren de la Rue, John Herschel, William Huggins, Father Angelo Secchi, and others [13].