Who discovered the size of earth?

Answer 1

Eratosthenes a greek librarian found the circumference of earth around 280BC. .

The locations were Alexandria and Aswan in Egypt. He found an image of the sun in a well at midday. At another location, eight hundred kilometers away, a vertical stick was producing a shadow of seven degrees. If 800 kilometers is seven degrees, then 360 degrees will be approximately 400,000 kilometers.

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Answer 2

Levi Acosta

The size of the Earth was first accurately determined by the ancient Greek mathematician and astronomer Eratosthenes in the 3rd century BCE. He calculated the Earth's circumference using the angles of shadows cast by the Sun at two different locations.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.