Carl Sagan-Globular earth deduced by Eratosthenes

Obarasubara 2016-01-30

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Carl Sagan-Globular earth deduced by Eratosthenes
Physics (Field Of Study),Eratosthenes (Astronomer),Carl Sagan (Academic),journalism,Journalist (Profession),Truth (Quotation Subject),Earth (Planet),Science (Journal),History (TV Genre),Mathematics (Field Of Study)
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