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Eratosthenes Kirensk – Greek mathematician, astronomer, geographer and poet. Student of Kallimaha, with 235 – Head of the Bibliotheca Alexandrina.

Works on Geodesy and geography.

In a strong connection with astronomy is the work of Eratosthenes, which consist in determining of the length of the meridian (about her is known from the Treatise Cleomedes about the rotation of the sky ).

In close connection with astronomy is the work of Eratosthenes, which consists in determining the length of the meridian (about her knowledge of the treatise Cleomedes On the rotation of the sky). Eratosthenes on the summer solstice (then he falls on June 19) held a successful experiment to measure the circumference of the earth. Moreover, it Eratosthenes coined the term Geography.

Eratosthenes is considered the father of geography.