Question

1. how did eratosthenes determine earths circumference? a) by measuring the distance to the sun b) by measuring the angle to the north star c) by measuring the distance to the moon d) by measuring the angle to the moon 15. how did the fall of the

Explanation:

Eratosthenes measured the angle of the Sun's rays at two different locations on Earth (Syene and Alexandria) on the summer - solstice. Using the known distance between the two cities and basic geometry, he calculated the Earth's circumference. He did not measure distances to the Sun, Moon or the angle to the North Star for this calculation.

Answer:

a) By measuring the distance to the Sun