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Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion.
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Angelo Secchi
Italian priest and scientist (1818–1878)
Angelo Secchi was an Italian Catholic priest and astronomer from the Italian region of Emilia. He was director of the observatory at the Pontifical Gregorian University for 28 years. He was a pioneer in astronomical spectroscopy, and was one of the first scientists to state…Source: Wikipedia (CC BY-SA)
Secchi disk
Tool used to measure water transparency/turbidity
The Secchi disk, as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water. The depth at which the…Source: Wikipedia (CC BY-SA)
Pope Pius IX
Head of the Catholic Church from 1846 to 1878
Pope Pius IX was head of the Catholic Church from 1846 to 1878. His reign of nearly 32 years is the longest verified of any pope in history; if including unverified reigns, his reign was second to that of Peter the Apostle. He was notable for convoking the First Vatican Council…Source: Wikipedia (CC BY-SA)