Giordano Bruno, in England, publishes his "Italian Dialogues", including the cosmological tractsLa Cena de le Ceneri ("The Ash Wednesday Supper"), De la Causa, Principio et Uno ("On Cause, Principle and Unity") and De l'Infinito Universo et Mondi ("On the Infinite Universe and Worlds").
Jean Errard publishes Premier livre des instruments mathématiques at Nancy.
Fabrizio Mordente publishes Il Signor del Compasso Fabritio Mordente. Con altri istromenti mathematici, suo fratello Gasparo da ritrovati at Antwerp and introduces the parallel rulers.