Eratosthenes
/ˌerəˈtɒsθəniːz/- (c.275-194 BC) , Greek scholar, geographer, and astronomer. The first systematic geographer of antiquity, he accurately calculated the circumference of the earth and attempted (less successfully) to determine the size and distance of the sun and of the moon.埃拉托色尼（约公元前275-前194, 希腊学者、地理学家和天文学家, 系第一位系统地研究古代的地理学家, 精确地计算出了地球的周长, 并试图测定太阳和月球的大小和距离, 但不很成功）。