How is length of Equator calculated?

It is equidistant from the North and South Poles and divides the globe into the Northern Hemisphere and the Southern Hemisphere. The length of the equator is the circumference of the circle. The circumference of the circle is $2\pi r$, where $r$ is the radius.

How was the equator determined?

The equator is the halfway point between the North Pole and the South Pole. It runs from side to side across the middle of the Earth through parts of South America, Africa, and Asia. Its position was not determined by choosing a halfway point between particular natural features, like the Earth’s poles.

Who measured the length of the equator first of all on scientific principles?

Eratosthenes
Eratosthenes was the first scientific Geographer who ascertained the length of equator on sound principles.

What is equatorial circumference?

The planet’s rotation causes it to bulge at the equator. Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). However, from pole to pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around.

What is the length of the equatorial diameter of the Earth?

about 12,756 kilometers
The Earth’s diameter at the Equator is about 12,756 kilometers (7,926 miles). At the poles, the diameter is about 12,714 kilometers (7,900 miles). The Earth’s equatorial bulge is about 43 kilometers (27 miles).

How is the Earth circumference measured?

Eratosthenes sent a man to Syene from Alexandria on foot to measure the distance between Alexandria and Syene. Thus, Eratosthenes measured the distance between the two cities is 800 km. He multiplied by 800 km to 50 and calculated that the Earth’s circumference is 40,000 km.

Which among the philosophers measured the Earth’s circumference?

Eratosthenes’ most famous accomplishment is his measurement of the circumference of Earth. He recorded the details of this measurement in a manuscript that is now lost, but his technique has been described by other Greek historians and writers.

How do you explain the equator to a child?

An equator is an imaginary line around the middle of a planet or other celestial body. It is halfway between the North Pole and the South Pole, at 0 degrees latitude. An equator divides the planet into a Northern Hemisphere and a Southern Hemisphere.

How was the Earth diameter 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. Eratosthenes then used this to calculate the circumference of the Earth to be about 250,000 stadia.