Giovanni Battista Riccioli

Giovanni Battista Riccioli

Infobox Scientist
name = Giovanni Battista Riccioli
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caption = Giovanni Battista Riccioli
birth_date = April 17 1598
birth_place = Ferrara, Italy
death_date = June 25 1671
death_place = Bologna
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nationality = Italian
ethnicity =
field = astronomy
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religion = Jesuit
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Giovanni Battista Riccioli (April 17 1598June 25 1671), was an Italian astronomer. He was a Jesuit who entered the order in 1614. He was also the first person to measure the rate of acceleration of a freely falling body.

Riccioli was born in Ferrara, Italy. He devoted his career to the study of astronomy, often working with Francesco Maria Grimaldi. He wrote the important work "Almagestum novum" in 1651. By necessity, he opposed the Copernican heliocentric theory though praising its value as a simple hypothesis.

He and Grimaldi extensively studied the Moon, of which Grimaldi drew a map. Much of the nomenclature of lunar features still in use today is due to him and Grimaldi. He also observed Saturn, and was one of the first Europeans to note that Mizar was a double star.

Other books he wrote were: "Geographiae et hydrographiae reformatae libri" (1661), "Astronomia reformata" (1665), "Chronologia reformata" (1669) and "Tabula latitudinum et longitudinum" (published in 1689).

Despite his stated opposition to Copernicus's theory he named a very prominent crater (Copernicus crater) after him, and other important craters were named after other proponents of the theory Kepler, Galileo and Lansbergius. Craters that he and Grimaldi named after themselves are in the same general vicinity, while some other Jesuit astronomers have craters named after them in a different part of the Moon, near Tycho crater. This is sometimes considered to be tacit sympathy for Copernican theory, which as a Jesuit he could not publicly express.

Between 1644 and 1656, he was occupied by topographical measurements, working with Grimaldi, determining values for the circumference of Earth and the ratio of water to land. Defects of method, however, gave a less accurate value for degrees of the meridian than Snellius had achieved a few years earlier. Snellius had been mistaken by approximately 4000 meters; but Riccioli was more than 10000 meters in error [Hoefer, 1873] . Riccioli had come up with 373,000 pes despite the fact that references to a Roman degree in antiquity had always been 75 milliare or 375,000 pes.

Riccioli died in Bologna.

See also

* List of craters on the Moon

References

* Ferdinand Hoefer: "Historie de l'astronomie", Paris 1873

External links

* [http://www.newadvent.org/cathen/13040a.htm Brief Riccioli biography] from the Catholic Encyclopedia.
* [http://galileo.rice.edu/Catalog/NewFiles/riccioli.html Facts about Riccioli] from Rice University's Galileo Project.
* [http://www.cosmovisions.com/Riccioli.htm Riccioli, Giovanni Battista] (French)


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