A value for Earth's circumference was first calculated by
A)Columbus.
B)Pythagoras.
C)modern satellite measurements.
D)a librarian at Alexandria named Eratosthenes.
E)da Vinci.

Question

Quizplus · Accepted Answer

The value for Earth's circumference was first calculated by a librarian at Alexandria named Eratosthenes. He measured the angle of the sun's rays at noon on the summer solstice in two cities and used this information to calculate the distance between them and the circumference of Earth.

A Value for Earth's Circumference Was First Calculated by