Eratosthenes

Eratosthenes was born to Aglaos and his wife in Cyrene, a Greek colony in North Africa.

Eratosthenes travels to Athens to study philosophy, mathematics, and astronomy under the guidance of prominent scholars.

Eratosthenes is appointed as the third Chief Librarian of the Library of Alexandria, succeeding Callimachus.

Eratosthenes calculates the circumference of the Earth with remarkable accuracy using the shadow cast by a vertical stick in Alexandria and Syene.

Eratosthenes devises the Sieve of Eratosthenes, an algorithm for finding prime numbers, which remains a fundamental tool in number theory.

Eratosthenes forms a close friendship with Archimedes, the renowned mathematician and inventor, through correspondence and shared intellectual pursuits.

Eratosthenes measures the tilt of the Earth's axis, contributing to the understanding of the planet's geometry and its effects on seasons.

Eratosthenes publishes 'Geographica,' a comprehensive work on geography that includes maps and detailed descriptions of the known world.

Eratosthenes proposes a calendar reform, introducing the concept of leap years to better align the calendar with the solar year.

Eratosthenes retires from his position as Chief Librarian of the Library of Alexandria, leaving a legacy of scholarly contributions.

Eratosthenes continues his research and writing, focusing on mathematics, astronomy, and geography, despite his retirement.

Eratosthenes loses his eyesight in his later years, but continues to dictate his works and engage in intellectual discussions.

Eratosthenes dedicates his final works to the young Ptolemy IV, ensuring the continuation of his legacy in the fields of science and mathematics.

Eratosthenes dies in Alexandria, leaving behind a rich legacy of contributions to mathematics, geography, and astronomy.