Who was the first person to calculate the circumference of the earth

Eratosthenes  (Greek mathematician)

Explanation:

What is Eratosthenes famous for? Eratosthenes measured Earth's circumference mathematically using two surface points to make the calculation. He noted that the Sun's rays fell vertically at noon in Syene (now Aswān), Egypt, at the summer solstice.

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.

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until then have a great week.

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