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MMLU / How did Eratosthenes estimate the size of the Earth in 240 B.C.?

Problem

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question

How did Eratosthenes estimate the size of the Earth in 240 B.C.?

choices

  1. By measuring the maximum altitude of the Sun in two cities at different latitudes at the same time on the same day.
  2. By measuring the size of Earth's shadow on the Moon during a lunar eclipse.
  3. By finding a place on Earth where the Sun passes directly overhead.
  4. By sending fleets of ships around the Earth.

subject

astronomy

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