# Question: What is the circumference of the earth?

## What is the full circumference of the earth?

In 200 B.C. Eratosthenes estimated Earth’s circumference at about 46,250 kilometers (28,735 miles ). Today we know our planet’s circumference is roughly 40,000 kilometers (24,850 miles ).

## What is Earth diameter and circumference?

If you measure the circumference of the Earth , while passing through the poles, the distance is only 40,007 km. This is because the Earth isn’t a perfect sphere. It’s rotating rapidly, which causes the equator to bulge out. The equatorial diameter of the Earth is 12,756 km.

## How do we measure the Earth?

‘ It was generally agreed upon that measuring the size of Earth could be done by measuring the altitude of a star from two cities situated on the same meridian. Then, a difference expressed in degrees would be found.

## What is the size and shape of the earth?

It is an oblate spheroid. It’s flattened at the poles and bulges at the equator. The Earth is 12,756 km at the equator and 12,714 km from pole to pole. We round this up to 13,000 km .

## How was Earth’s diameter calculated?

This means that Eratosthenes estimated the circumference of the Earth to be about 40,000 km. He also knew that the circumference of a circle was equal to 2 times π (3.1415) times the radius of the circle. The diameter of a circle is twice the radius, giving us a diameter for Earth of 12,756 km.

## Who named the planet Earth?

The name “Earth” is derived from both English and German words, ‘eor(th)e/ertha’ and ‘erde’, respectively, which mean ground. But, the handle’s creator is unknown. One interesting fact about its name: Earth is the only planet that wasn’t named after a Greek or Roman god or goddess.

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## What is the exact shape of the earth?

The Earth is an irregularly shaped ellipsoid . While the Earth appears to be round when viewed from the vantage point of space, it is actually closer to an ellipsoid . However, even an ellipsoid does not adequately describe the Earth’s unique and ever-changing shape.

## How was the Earth first measured?

Eratosthenes then measured the angle of a shadow cast by a stick at noon on the summer solstice in Alexandria, and found it made an angle of about 7.2 degrees, or about 1/50 of a complete circle. He realized that if he knew the distance from Alexandria to Syene, he could easily calculate the circumference of Earth .