the Earth move is similar to whatever moves Mars or Jupiter and is the same as that which pulls the stone to Earth. Calling it gravity does not explain what it is.

Day three

Salviati starts by dismissing the arguments of a book against the novas he has been reading overnight. Unlike comets, these were stationary and their lack of parallax easily checked and thus could not have been in the sublunary sphere. Simplicio now gives the greatest argument against the annual

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