(3) Planet Blue

NASA REVEALS REAL SIZE OF THE EARTH IS BIGGER than first thought

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Shape and Size of Earth

 Earth is almost spherical in shape with flattened poles and a bulging equator. The circumference of Earth around the equator is larger than at the poles. The diameter of Earth at the poles is about 7,899.83 miles, but around the equator, it is about 7,926.41 miles.

Earth is the fifth largest planet in the solar system.

 Earth's spin causes it to bulge slightly at the equator.

The circumference of Earth around the equator is 24,901.55 miles.

The circumference of Earth around the poles is 24,859.82 miles.

Earth is slightly pear-shaped.

Around 200 BCE, Eratosthenes, from the library of Alexandria, was able to determine the size of Earth.

Term:

Geodesy - Geodesy is the scientific study of the shape and size of Earth.

Pythagoras and Earth

In the 6th century BCE, Greek philosopher Pythagoras was the first person to say that Earth was spherical.

 

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