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jan 1, 1609 - In 1609, Galileo advances the magnitude of the telescope to 20x

Description:

With this extended telescope, he was rewarded a lecturing position for life at the University of Padua. With this, he was able to examine celestial objects like Jupiter's moons and the cratered surface of the moon.

Added to timeline:

19 Jan 2020
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Date:

jan 1, 1609
Now
~ 417 years ago