based on the tides. In all the conversations between the three men, Galileo achieves the maximum effect by building up the traditional arguments through Simplicio and then, just when they appear invincible, destroying them.

The Dialogue had a huge influence. It was written in a style that brought home to many people the overwhelming weight of evidence in favour of a heliocentric universe. This is how John Playfair, Professor of Natural Philosophy at Edinburgh, described it in 1819:

His dialogues contained a full exposition of the evidence of the earth's motion, and set forth the errors of the old, as well as the discoveries of the new philosophy, with

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