Eratosthenes measured the circumference of Earth to within 4% of the correct value

By Allen Kazadi
1 Min Read

Eratosthenes measured the circumference of Earth to within 4% of the correct value

A. Looking at stick shadows on the equinox.
B. Noting how much more of the celestial sphere came into view when walking south.
C. Sighting the stars from within the deepest well in Egypt on the day of the solstice.
D. Using the detailed reports of far-sailing mariners

Answer:

A. Looking at stick shadows on the equinox.

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