Paolo Casati

"Casatus" redirects here. For the lunar crater, see Casatus (crater).

Reverend Paolo Casati
Born	(1617-11-23)23 November 1617 Piacenza, Duchy of Parma and Piacenza
Died	22 December 1707(1707-12-22) (aged 90) Parma, Duchy of Parma and Piacenza
Occupations	Mathematician Physicist
Known for	his contributions to physics experiments and observations
Parent(s)	Lodovico Casati and Vittoria Casati (née de' Punginibbi)
Academic background
Influences	Aristotle Paul Guldin Galileo Galilei Marin Mersenne
Academic work
Discipline	Mathematician, Physicist
Institutions	Roman College University of Parma
Notable students	Francesco Lana de Terzi
Influenced	Gaspar Schott

Paolo Casati (in Latin, Paulus Casatus) (23 November 1617 – 22 December 1707) was an Italian Jesuit mathematician. He belonged to the jesuit scientific school founded in the Provincia Veneta by Giuseppe Biancani, and represented later by Niccolò Cabeo, Niccolò Zucchi, Giovanni Battista Riccioli and Francesco Maria Grimaldi.

Biography

Born in Piacenza to a Milanese family, he joined the Jesuits in 1634. After completing his mathematical and theological studies, he moved to Rome, where he assumed the position of professor at the Collegio Romano. He was given the chair in mathematics after teaching philosophy and theology.

Casati in Sweden

In 1651, Casati was sent on a mission to Stockholm in order to gauge the sincerity of Christina of Sweden's intention to become Catholic. He subsequently returned to his post at Rome. In 1677, he moved to the Jesuit College in Parma, where he remained until his death. Casati was a friend and correspondent of the famous florentine librarian Antonio Magliabechi, and other scientists like Carlo Rinaldini, Giovanni Antonio Rocca and Daniello Bartoli.

Casati's Terra machinis mota

The astronomical work Terra machinis mota (1658) imagines a dialogue between Galileo, Paul Guldin, and Marin Mersenne on various intellectual problems of cosmology, geography, astronomy and geodesy. For example, they discuss how to determine the Earth's dimensions, floating bodies, the phenomena of capillarity, and also describe the experiment on the vacuum made by Otto von Guericke in 1654. The work is remarkable for the fact that it represents Galileo in a positive light, in a Jesuit work, only 25 years after Galileo's condemnation by the Church.

Casati and Theories on the Vacuum

De igne, 1686

Casati discussed the hypothesis of horror vacui, that nature abhors a vacuum, in his thesis Vacuum proscriptum, published in Genoa in 1649. Casati confuted the existence of both vacuum and atmospheric pressure, but he did not rely entirely on scientific observation, and refers to Catholic thought in order to back his claims. The absence of anything implied the absence of God, and hearkened back to the void prior to the story of creation in the book of Genesis (see Vacuum: historical interpretation).

Named after Casati

The crater Casatus on the Moon is named after him.

Other works

• Fabrica et uso del compasso di proportione (1664), a work explaining the construction and use of proportional compasses.
• Le ceneri dell'Olimpo ventilate (1673), a dialogue about meteorology.
• De gli horologi solari (unpublished manuscript): about sundial construction.
• Mechanicorum libri octo (in Latin). Lyon: Anisson, Posuel et Rigaud. 1684.
• De igne (in Latin). Venezia: Nicolò Pezzana. 1686.
• Exercitationes matheseos candidatis exhibitaæ (1698) (unpublished manuscript): a collection of algebraic and geometrical subjects.

See also

• List of Jesuit scientists
• List of Roman Catholic scientist-clerics

Sources

• De Ferrari, Augusto (1978). "CASATI, Paolo". Dizionario Biografico degli Italiani, Volume 21: Caruso–Castelnuovo (in Italian). Rome: Istituto dell'Enciclopedia Italiana. ISBN 978-8-81200032-6.
• The scientific works of Paolo Casati (1617-1707)
• Elazar, Michael; Feldhay, Rivka (2018). "Jesuit Conceptions of Impetus After Galileo: Honoré Fabri, Paolo Casati, and Francesco Eschinardi". Emergence and Expansion of Pre-Classical Mechanics (pp.285-323). doi:10.1007/978-3-319-90345-3_10.