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What was the aperture of the first Galileo's telescope?

Galileo used a refractor i.e. no mirror: but what was the aperture?
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1answer
75 views

Did Galileo really see Galilean Moons?

I want the answer to incorporate apparent magnitudes of those moons, power of his telescope, light pollution of that time, successful recreation of the scenario of watching Galilean moons using that ...
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Is Spivak right in what he says about Galileo?

On chapter 9 of M. Spivak's book on calculus there is an exercise in which Spivak asks the reader to prove that Galileo "got his facts wrong". More specifically, Spivak asks one to to show if a body ...
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6answers
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How did heliocentrism survive after Galileo's sentencing?

Did the church continue to prosecute scientists for heliocentrism? If not, why not? What changed? Why didn't the church go after Isaac Newton?
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1answer
420 views

Where did Galileo say “All truths are easy to understand once they are discovered. The point is to discover them.”?

I've heard it claimed Galileo said or wrote: All truths are easy to understand once they are discovered. The point is to discover them. Where did he say this?
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1answer
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What are the origins of Galileo's paradox?

Galileo's paradox is the observation that the natural numbers can be put into one to one correspondence with the square numbers, showing that an infinite set can be bijected to a proper subset of ...