Questions tagged [galileo]

Galileo di Vincenzo Bonaulti de Galilei (1564-1642) was an Italian astronomer, physicist and engineer from Pisa.

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Did Galileo use an erroneous geometrical result in 'Two New Sciences'?

In Thm. 4, Prop. 4 of Galileo's 'Two New Sciences' (pg. 187, Crew Translation), Galileo says the following: "From a single point $B$ draw the planes $BA$ and $BC$, having the same length but ...
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Who studied kinematics before Galileo? Did Galileo base his kinematic research on the previous work of any other scientist?

Galileo is known to have studied kinematics through his work with projectiles. How did he first consider researching motion and velocity? Was he inspired by previous work done by earlier scientific ...
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What is the explanation of rope's strength in Galileo's Two New Sciences?

I'm reading Galileo's Two New Sciences. But as other Scientific Book it is hard. I am having trouble in First day, where SIMPLICO asks this question(Page 7): "But how can one make a rope one ...
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Does Galileo's method of tracing a parabola actually work?

In Two New Sciences, Galileo writes: I take a perfectly round brass ball about the size of a walnut and project it along the surface of a metallic mirror held in a nearly upright position, so that ...
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Did Galileo state the principle of equivalence in full generality?

The weak equivalence principle (WEP) is often attributed to Galileo. Did Galileo ever state the WEP precisely? For instance as given here? The original principle, usually attributed to Galileo, ...
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Doubt regarding “Two New Science” by Galileo Galilei

I was reading "Two New Sciences" by Galileo Galilei and therein was a chapter named third day which deals with motion. When I started reading that chapter I eventually came across the theorem 1 ...
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How did people believe Aristotle's law of gravity for so long?

So he says that heavier objects fall faster than light ones and size is irrelevant? (at least as far as I understand) This brings 2 easy ways to see the error of this. 1) throw a big rock and a ...
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Could someone have discovered the moons of Jupiter before Galileo?

As Hans Lipperperhey had made a decent telescope albeit worse telescope before Galileo, source, would he have been able to theoretically view the moons of Jupiter before Galileo if he had looked?
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358 views

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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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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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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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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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 ...
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228 views

What were the most important discoveries of Galileo in mechanics?

Galileo was a real physicist and mathematician besides being an astronomer. But what were his contributions to mechanics like throw and fall and collision? Did he perhaps already know Newton's first ...
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Biographical articles on Newton and Galileo by physicist or historian

I am going to give a lecture to school children on the lives of Newton, Galileo and Einstein. I have enough literature on Einstein but not enough on the lives of Galileo and Newton. So I am looking ...
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Was Galileo a plagiarizer?

Was Galileo a plagiarizer? If we where to apply to the works of Galileo the general standards of plagiarism that we conform to today at our local institutions, would he be considered a plagiarizer? ...
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Did Galileo bet money on the ship experiment?

Galileo's writings describe two experiments involving ships. These are summarized in the Wikipedia article Galileo's ship. (A lot of the text in the article is mine, and if there are things I'm ...
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Did Galileo's writings on infinity influence Cantor?

To what extent was Cantor motivated by Galileo's paradox? More generally, to what extent were late 19th century mathematicians motivated by, or even aware of, Galileo's paradox? This is an issue I've ...