# Which Greek scientist concluded that Earth was round?

Eratosthenes

In Syene (now Aswan, Egypt), Eratosthenes noticed that the Sun's rays fell directly at noon on the summer solstice, producing no shadow. However, when he travelled to Alexandria (a nearby city), he noticed that the Sun's rays produced a shadow from a wall. Curious about the phenomenon, he calculated the angle between the object and the shadow it created, noted as,

Because of the Alternate Interior Angle Theorem, Eratosthenes also knew that angle

He also found the distance between Syene and Alexandria (5,000 stadia or about 500 miles/800 kilometres), which led him to create the following equation:

#360^@/7.2^@="circumference of Earth"/"distance from Alexandria to Syene"#

Since Eratosthenes knew the distance from Alexandria to Syene, all he had to do was solve for the circumference of the Earth. From his findings, he concluded that the Earth was round.

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The Greek scientist who concluded that the Earth was round was Pythagoras.

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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.

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.

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.

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