eratosthenes

• 专有名词，指古希腊数学家、天文学家、地理学家埃拉托色尼（约公元前276—前194年），以首次较为精确地测算地球周长和估算日月距离而闻名。

A proper noun referring to a Greek mathematician and astronomer from the 3rd century BC, known for calculating the Earth's circumference and estimating distances to the Moon and Sun.

不可数 · 专有名词

1. Greek scholarC1formal

   An ancient Greek mathematician, astronomer, and geographer who accurately calculated the Earth's circumference and the distances to the Moon and Sun.

   古希腊学者

   • Eratosthenes used shadows and geometry to estimate the Earth's size.
   • The works of Eratosthenes laid the foundation for modern geography.
   • He was the chief librarian of the Library of Alexandria.