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He showed that in a normal star, gravitation and radiation pressure balance each other.
He also showed that the life-story of a star depends upon its original mass.
Measurements that he made during a total eclipse of the sun confirmed Einstein’s theory of relativity.
Euctamon (fl. ca. 450 BCE)
Born in Greece.
He calculated the lengths of the seasons, starting from the summer solstice, to be ninety days, ninety days, ninety-two days, and ninety-three days, respectively.