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[[[> IMG:Galileo_5.jpeg ]]]
One of the very few people in history known almost exclusively by his first name.
Galileo (15 February 1564 - 8 January 1642) worked out (correctly) that the distance an object travels when falling is proportional to the square of the time. He performed a series of elegant experiments with balls rolling down a slope, and timing how long it takes.
* Pendulum is isochronous
* /d/ proportional to EQN:t^2
* Very early telescope
* 1610: Eclipses of Galilean Moons, Moons of Jupiter
* 1610: Phases of Venus
* 1638: Speed of Light (failed)
One of the Famous People on this site.