See also: Cardan joint
Gerolamo Cardano sometimes named Girolamo Cardano , Hieronymus Cardanus in Latin or Jerome Cardan in French (Pavia, 1501 - Rome, 1576) is a Mathématicien, a Philosophe, a Juriste and a Italian Médecin .
He professed mathematics, then medicine with Milan and to Bologna, travelled in Scotland, England, France, operating marvellous cures, and finished its life with Rome. There, it was approved with the Collège of the doctors and the pope made him a pension.
In 1547, the king of the Denmark had invited it to come in its States, but the climate and the religion diverted it to accept advantageous which this sovereign quoted to him.
Its name is also associated with a method of Stéganographie using a grid with holes masking part of a text to reveal the useful words. It will become later a method of Cryptographie when the grid can be turned of a quarter of turn (technical used for example in the novel Mathias Sandorf of Jules Verne).
It gave its name to a mechanical system allowing the free Gyroscope and having given rise to the Joint of transmission (an universal joint having become a cardan joint).
After the publication of this book the author knew great misfortunes, his son was carried out in Pavia to have killed his wife.
Set on Astrology, it carries out a horoscope of the Christ, which explains why the Passion corresponds to the conjunction of planets what is worth to him, in 1570, to be stopped by the Inquisition for Hérésie.
A few weeks before its death, it finishes its Autobiographie, Of propria vita, which meets a certain notoriety. By provocation undoubtedly, Cardan enumerated itself its defects in this autobiography. One seldom went also far in the consents.
The rumor tells that Cardan would have committed suicide because an astrological prediction of its death appeared false. He wanted to thus return it just, which shows the dangers of the naive beliefs concerning the Astrologie.
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