Eratosthenes

Eratosthenes used two points, one almost exactly north of the other.

Eratosthenes reasoned that a round Earth would explain the difference.

It seems that, in practical appeal, Eratosthenes's reduction may have won the day.

Eratosthenes also proposed a simple algorithm for finding prime numbers.

Eratosthenes threw in a few other simple facts and got back a lot more than he'd bargained for.

Then they worked out, using roughly the same sort of geometry as Eratosthenes, that those lights in the sky were a very long way away.

It is named after the crater Eratosthenes, whose formation marks the beginning of this period.

Eratosthenes measured the circumference of the earth without leaving Egypt.

Eratosthenes even seems to have had some idea of the principle by which its exact configuration has been in quite modern days determined.

They are known or can be found quickly using Sieve of Eratosthenes.

Eratosthenes went further and computed the tilt of the Earth's axis to within a degree.

Eratosthenes considering his great problem is especially popeyed and demented-looking.

Indeed, not even Eratosthenes presented what could be considered a decent amount of information according to the standards of later times.

Eratosthenes used a simpler sexagesimal system dividing a circle into 60 parts.

In 1849 he constructed a model of the moon's surface showing the lunar crater Eratosthenes.

If true, that would make Eratosthenes the inventor of the eight-wind compass rose.

Eratosthenes called it the Tropic because it marked the turning point.

Eratosthenes deducted two winds from Aristotle's system, to produce the classical 8-wind rose.

Another similar set of measurements is given by Strabo (11.8.9) following Eratosthenes.

It is addressed to Eratosthenes and the mathematicians in Alexandria.

Soon Eratosthenes disappeared under the horizon without the projectile being sufficiently near to allow close observation.

Oenopides's result remained the standard value for two centuries, until Eratosthenes measured it with greater precision.

This algorithm is known in mathematics as the Sieve of Eratosthenes.

This is how the Sieve of Eratosthenes works, essentially.

At midday, when the sun was at its highest, Eratosthenes cast a definite shadow.