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Updated: May 12, 2025
In 1665 Cassini, with a fine telescope, 35-feet focal length, observed many spots moving from east to west, whence he concluded that Jupiter rotates on an axis like the earth. He watched an unusually permanent spot during twenty-nine rotations, and fixed the period at 9h. 56m. Jupiter's rapid rotation ought, according to Newton's theory, to be accompanied by a great flattening at the poles.
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