* Possible date-Nicolaus Copernicus begins to write Commentariolus, an abstract of what will eventually become his heliocentric astronomy De revolutionibus orbium coelestium ; he sends it to other scientists interested in the matter by 1514.

* Possible date-Nicolaus Copernicus begins to write De revolutionibus orbium coelestium (" On the Revolution of the Heavenly Spheres ").

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