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Updated: May 10, 2025
He had done this with the astronomical measurements of Tycho Brahe, and had extracted from them the celebrated 'laws of Kepler. He did it also with Vitellio's measurements of refraction. But in this case he was not successful. The principle, though a simple one, escaped him, and it was first discovered by Willebrord Snell, about the year 1621.
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