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 $t^2$
• Very early telescope
• 1610: Eclipses of Galilean Moons, Moons of Jupiter
• 1610: Phases of Venus
• 1638: Speed of Light (failed)

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