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 cosmos is a library without end.
Comets are heavenly visitors, not harbingers of doom.
In measuring the Earth, I measured my place in it.
The equinox balances day and night, as wisdom balances knowledge.
Astronomy teaches humility before the infinite.
The globe's curve unites distant shores.
Poetry in the stars, prose in the calculations.
The sieve of time leaves only the eternal truths.
Sirius rising heralds the flood, a stellar calendar.
Beta I am, yet in curiosity, alpha.
The heavens' map is drawn with angles and arcs.
Fame fades, but the Earth's measure stands.
As with most ancient scholars, Eratosthenes's original works are largely lost to us, known primarily through fragments quoted by later authors.
The circumference of the Earth is 250,000 stadia.
The circumference of the Earth is 252,000 stadia.
The distance from Syene to Alexandria is 5,000 stadia.
At Syene, the sun's rays fall vertically at the summer solstice.
At Alexandria, the sun's rays cast a shadow, indicating an angle of 1/50th of a circle.
The Earth is a sphere.
The obliquity of the ecliptic is 23°51'19".
Contemporaries of Eratosthenes
Other Astronomys born within 50 years of Eratosthenes (-276–-195).