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Maybe a word about the Greeks? Around 330BCE, Callipus, a student of Eudoxus at Plato's Academy and of Aristotle at his Lyceum, determined the length of the tropical year (that is to say the interval of time between two vernal equinoxes or two summer solstices) to be 365+1/4 days. He also showed that the four seasons (defined as the interval of time ...

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