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LIBRARY OF CONGRESS, RARE BOOK AND SPECIAL COLLECTIONS DIVISION / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS, RARE BOOK AND SPECIAL COLLECTIONS DIVISION / SCIENCE PHOTO LIBRARY
Galileo's theories of observations from 'Il Saggiatore' (1623, 'The Assayer'). This work by Italian astronomer Galileo Galilei (1564-1642), was about comets and contained treatises on natural philosophy and mathematics. The illustration on this page shows the optics of a human eye observing a candle flame, with the accompanying text talking about observations made of stars using a telescope.
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