circumference of earth in km

It is 40075.017km. You can figure out the earth’s circumference using a geometric formula that’s over 2,000 years old! For this calculation, the longitude isn't needed. Contrary to popular belief, Christopher Columbus did not discover that the Earth is round. Earth Radius by Latitude Calculator. In General, the circumference of the earth along the Equator is measured. Or maybe 39,690 km (if he used Egyptian stadia), or 46,620 km (if he used the Attic stadion), depending on which stadion he used. The Earth is a bit wider than it is tall, giving it a slight bulge at the equator; this shape is known as an ellipsoid, or, more properly, a geoid. in Cyrene, Libya, Eratosthenes soon became one of the most famous mathematicians of his time. It's called the equatorial bulge and it's the result of centrifugal force outward due to the spin of the Earth. Mathematically, Earth is a spheroid. Eratosthenes was the head librarian in Alexandria, Egypt, the center of learning in the … The earth is indeed round, but not a perfect sphere. Celestial bodies are not spheres, but are oblate at their poles. English: 24,901 miles . He is best known for making the first recorded measurement of the Earth… Eratosthenes, some 2,200 years ago, was off by only 125 km or 101 mi. Earth isn't a perfect sphere, but is oblate at its poles, due to its rotation. In the mid-20th century we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. However, the Earth is not quite a perfect circle, and if you measure through the poles, the circumference is a bit shorter—24,859.82 miles. Born around 276 B.C. Equatorial Circumference . The pole to pole circumference is 24,859.82 miles (40,008 km). 1 mi = 1.6 km so 8000 mi x 1.6 km/mi = 12800 km (the correct answer is ~12742 km) So you can always figure out the dimensions from your basic knowledge of traveling! The equatorial circumference of the Earth is 40,075 km. 5. Therefore, the Earth radius isn't constant, but it can be calculated for every location. This is the distance around the equator of the Earth. The circumference of Venus is very nearly the same as the Earth's. Earth takes up only a small portion of the sun's circumference. In 240 B.C., the Greek astronomer Eratosthenes made the first good measurement of the size of Earth.By noting the angles of shadows in two cities on the Summer Solstice, and by performing the right calculations using his knowledge of geometry and the distance between the cities, Eratosthenes was able to make a remarkably accurate calculation of the circumference of Earth. Using those measurements, the equatorial circumference of Earth is about 24,901 miles (40,075 km). The circumference of the Earth in kilometers is 40,075 km, and the circumference of the Earth in miles is 24,901. Metric: 40,075 km . At the North and at the South pole of the earth is somewhat flattened. But over 2000 years earlier, a man named Eratosthenes in Ancient Greece came up with nearly the exact same figure using just a stick and his brain. The polar circumference is slightly shorter at 40,008 km (24,860 miles). The circumference around the poles is 40007.86km. A meter (the SI unit for the length) was once defined as 1/10 000 000 of the distance from Equator to the pole . Therefore, their circumference is the largest at the equator. Which was to say at that time the circumference of the Earth was precisely 40 000km. The Earth has its biggest circumference around the equator. The earth is not a perfect sphere but is slightly oblate, or flattened at the poles.