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 Sieve of Eratosthenes is an efficient method for finding prime numbers.
There is an infinite number of prime numbers.
Mathematics is the foundation of all knowledge.
The universe is governed by mathematical principles.
The constellations have stories and meanings.
Mythology can be used to understand the celestial sphere.
The Earth is at the center of the universe.
The sun revolves around the Earth.
The moon has phases due to its position relative to the sun and Earth.
The Earth casts a shadow on the moon during a lunar eclipse.
The sun is much larger than the Earth.
The planets move in complex paths.
The Earth is not perfectly smooth, but has mountains and valleys.
The shape of the land is constantly changing.
Rivers flow from higher elevations to lower elevations.
The climate of a region is influenced by its latitude.
Different cultures have different ways of understanding the world.
The study of geography should be based on empirical evidence.
The world can be mapped with increasing accuracy.
The Earth is a complex and dynamic system.
Contemporaries of Eratosthenes
Other Astronomys born within 50 years of Eratosthenes (-276–-195).