To understand the Earth, one must first understand the sky; ... - Eratosthenes

"To understand the Earth, one must first understand the sky; to understand the sky, one must study light."

Eratosthenes

Mathematician Geographer Ancient Greece 276–194

More from Eratosthenes

"Measure the Earth and you measure the heavens."

"Knowledge is the greatest treasure of all."

"The pursuit of truth requires courage and perseverance."

"In mathematics, all things are possible."