David Kalonymus ben Jacob
Encyclopedia
David Kalonymus ben Jacob (David ben Jacob Meïr) was an Italian Jewish astrologer
Astrologer
An astrologer practices one or more forms of astrology. Typically an astrologer draws a horoscope for the time of an event, such as a person's birth, and interprets celestial points and their placements at the time of the event to better understand someone, determine the auspiciousness of an...

 of the fifteenth century, and a member of the Kalonymus family.

He wrote in 1464 two astrological treatises, the smaller of which is on the conjunction of Saturn and Jupiter. He dedicated the latter work to King Ferdinand I of Naples
Ferdinand I of Naples
Ferdinand I , also called Don Ferrante, was the King of Naples from 1458 to 1494. He was the natural son of Alfonso V of Aragon by Giraldona Carlino.-Biography:...

, and hoped thereby to obtain religious liberty for his coreligionists.

In 1466 David translated from Latin into Hebrew an astronomical work of John of Gmünd
Johannes von Gmunden
Johannes von Gmunden was a German/Austrian astronomer, mathematician, humanist and early instrument maker.He received the degree of a master of arts at Vienna University in 1406...

, which he called Mar'ot ha-Kokabim ("The Aspects of the Stars"). The work is a description of an astronomical instrument which had been invented at Vienna
Vienna
Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...

 in 1417. He was invested by the king with an office, probably that of astrologer.

In 1484 he wrote a philosophical treatise on the Destructio Destructionis of Averroes
Averroes
' , better known just as Ibn Rushd , and in European literature as Averroes , was a Muslim polymath; a master of Aristotelian philosophy, Islamic philosophy, Islamic theology, Maliki law and jurisprudence, logic, psychology, politics, Arabic music theory, and the sciences of medicine, astronomy,...

, which he addressed to his son Ḥayyim Kalonymus.

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