Galileo Galilei is born
On this day · 15 February 1564
The man who turned a telescope skyward and shook the heavens off their ancient pedestal was born in Pisa.
On February 15, 1564, Galileo Galilei was born in Pisa, into a declining family of Florentine patricians. He would grow into one of the founders of modern science—a physicist, mathematician, and astronomer whose careful observation reshaped how humanity sees the cosmos.
In 1609, hearing of a newly invented “spyglass,” Galileo built his own improved telescope and aimed it at the night sky. He became the first person to record telescopic observations of the heavens, spotting craters on the Moon and four moons orbiting Jupiter.
His sightings of Jupiter’s moons and Venus’s phases supported the radical idea that the Earth circles the Sun.
That support for Copernican astronomy collided with Church doctrine. In 1633 Galileo was forced to recant and spent his final years under house arrest. Vindication came centuries later, his place as the father of observational astronomy secure.
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