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Galileo's The System of the World in Four Dialogues - 1661

Title page of Galileo's 'The System of the World in Four Dialogues'.

An illustration from Galileo's 'The System of the World..' showing the moons of Jupiter on page 297.

Extract from Galileo's 'The System of the World...'

Here, on page 422, Galileo is refuting Kepler on the case of tides.

Kepler's Astronomia Nova published 1609.

An illustration from Kepler's 'Astronomiae Pars Optica showing the eccentric orbit of Mars on page 4.

An illustration from Kepler's 'Astronomiae Pars Optica showing the elliptical orbit of Mars on page 306.