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* [[Eratosthenes]] ({{circa|276|194/195 BC|lk=on}}), a Greek mathematician who [[On the measure of the Earth|calculated]] the circumference of the Earth and also the distance from the Earth to the Sun. | * [[Eratosthenes]] ({{circa|276|194/195 BC|lk=on}}), a Greek mathematician who [[On the measure of the Earth|calculated]] the circumference of the Earth and also the distance from the Earth to the Sun. | ||
6550/40 - 5430/20 BC | |||
Decade ranges. | Decade ranges. |