Galileo didn’t invent astronomy, but he DID invent mechanical physics
Ethan Siegel
344

Ethan wrote that Galileo “was able to do this without a stopwatch, without any form of clock at all.”

Galileo also revolutionized the time measurement: he discovered that the pendulum can work as the source of the regular “ticks,” that is: “ the period (the time in which a pendulum swings back and forth) does not depend on the arc of the swing (the isochronism)

So the pendulum, with the properties that he discovered, was surely quite a convenient tool which could have helped him to position his triggers on the inclined plane he used.

Another “clock” device that was used long before him but also by him (apparently even by Babylonians for astronomical calculations as early as 2000 years BC) is clepsydra.

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