Eratosthenes
He accurately calculated the circumference of the Earth using geometric principles and observations of shadows.
Most quoted
"Give me a lever long enough and a fulcrum on which to place it, and I shall move the world. (Often attributed to Archimedes, but Eratosthenes was also known for similar sentiments regarding the power of measurement and calculation)"
— from Public Address
"To understand the world, one must first measure it. Measurement is not just about numbers; it is about defining boundaries, understanding relationships, and ultimately, comprehending our place within the vastness."
— from Inferred from his scientific methodology
"The Earth is a sphere, and its circumference can be measured. This knowledge, though seemingly practical, reveals the order and the measurable nature of the cosmos, hinting at a deeper, underlying truth."
— from Inferred from his work on Earth's circumference
All quotes by Eratosthenes (354)
The distance to the Moon is 780,000 stadia.
The distance to the Sun is 4,000,000 stadia.
The Sieve of Eratosthenes is a method for finding prime numbers.
He was called 'Beta' because he was second in every field of knowledge.
He was called 'Pentathlos' because he excelled in many fields.
He was called 'Cosmographer' for his work on the world.
He was the first to use the term 'geography'.
The Earth is divided into five zones: one torrid, two temperate, and two frigid.
He attempted to fix the dates of the Trojan War.
The Earth is a sphere, and its circumference can be measured by observing the sun's shadow at different latitudes.
His method for measuring the Earth's circumference was remarkably accurate for his time.
He was a polymath, excelling in mathematics, geography, astronomy, history, and poetry.
He served as the chief librarian of the Library of Alexandria.
His work 'Geographica' was a systematic treatise on the world.
He was a student of Callimachus.
He was born in Cyrene.
He died in Alexandria.
His 'Catastoris' contained a catalogue of stars.
He made significant contributions to the field of mathematical geography.
His work laid the foundation for later geographical studies.
Contemporaries of Eratosthenes
Other Astronomys born within 50 years of Eratosthenes (-276–-195).