Amazigh Eratosthenes
He who was the first to calculate the circumference of the globe:
Eratosthenes was born in the city of Sirin, Libya, in the year 276 BC. He died (of starvation) in 194 BC. In the city of Alexandria, Egypt. It is believed that he starved himself to death upon becoming blind from being unable to complete his work. When he was young, he was studying in the Greek city of Athens. With time, Eratosthanes drew the attention of the ruler of Egypt at the time, Ptolemy III, for his superiority in several fields, which prompted Ptolemy to invite him to reside in the city of Alexandria for two reasons: to educate his son and to be the general secretary of the great Alexandrian library.
Eratosthenes is called the father of geography, and he is the one who gave him this name (geography). In addition, Eratosthanes was a mathematician, astronomer and even a poet! His geographical achievements are numerous, including, establishing a system of latitude and longitude, measuring the circumference of the globe with great accuracy, measuring the distance between the sun, the earth, the earth and the moon, drawing a map of the world (note the picture) better than the previous ones from maps in which his understanding of the sphericity of the earth is clear. He also has multiple mathematical achievements, such as the “sieve of Eratosthanes,” which filters and reveals prime numbers
. The Arabs wrote his name: Aratthnis and Aratus. Ibn Jaljal described him, saying: "Aratus the astrologer who was not more knowledgeable than him."
Source : websites