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April 1, 2024
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jun 20, 1603 - 1604, first known astronomical observation is of a supernova (explosion of a dead star) visible in the sky. It challenged Aristotle's claim of not thing will take place in the sky/heavens.
Added to timeline:
23 Oct 2018
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Galileo
Date:
jun 20, 1603
Now
~ 421 years ago