De Revolutionibus</em>, Nicolaus Copernicus
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Around this time, Leonardo may have assisted in painting Tobias and the Angel by Andrea del Verrocchio.

His earliest independent painting, the Annunciation, may have commenced at this stage.

Leonardo’s earliest certain drawing was produced during this year. It is a view of the landscape of the Arno river and Valley, which has an inscription that reads, “(feast) of Saint Mary of the Snow/ - day of August 5th, 1473”.

Birth of Nicolas Copernicus, the founder of modern astronomy and author of De Revolutionibus, in which he established that the earth rotated on its axis once a day and travelled around the sun once yearly, which was a revolutionary concept at the time.

Printing of Musical Notes introduced.