How is the diameter of Earth calculated?
How is the diameter of Earth calculated?
The diameter of a circle is twice the radius, giving us a diameter for Earth of 12,756 km. Note: The Earth is almost, but not quite, a perfect sphere. Its equatorial radius is 6378 km, but its polar radius is 6357 km – in other words, the Earth is slightly flattened.
When was Earth’s diameter calculated?
June, ca. 240 B.C. Eratosthenes Measures the Earth. By around 500 B.C., most ancient Greeks believed that Earth was round, not flat. But they had no idea how big the planet is until about 240 B.C., when Eratosthenes devised a clever method of estimating its circumference.
How do you calculate diameter example?
Who calculate the radius of Earth?
Eratosthenes made his measurement on the summer solstice, and had the additional knowledge that on that day the sun was directly overhead at a location a known distance south of Alexandria, on the Tropic of Cancer. This enabled him to compute the Earth’s radius.
How did scientists find the radius of the earth?
During the 3 century, B.C. Eratosthenes was able to mathematically calculate the diameter of the earth by comparing the difference in the angle of the sun’s rays at different geographic points. He was the first person that was able to calculate the radius of the earth.
How do you find the radius of the earth in physics?
Compute the radius of the earth using the formula C (circumference) = 2 x pi x r (radius). Erastosthenes’ formula would look like this: 39,350 = 2 x 3.14 x r, or 6,267 kilometers.
What are the two formulas for diameter?
| Diameter of a Circle | D = 2 × r |
|---|---|
| Circumference of a Circle | C = 2 × π × r |
| Area of a Circle | A = π × r2 |
| Diameter of a Circle | D = 2 × r |
|---|---|
| Circumference of a Circle | C = 2 × π × r |
| Area of a Circle | A = π × r2 |
What is diameter class 7?
Diameter is defined as the line passing through the center of a circle having two extremes on the circumference of a circle. The Diameter of a circle divided the circle into two equal parts known as semi-circle.
What is the method of diameter?
If you know the radius of the circle, double it to get the diameter. The radius is the distance from the center of the circle to its edge. If the radius of the circle is 4 cm, then the diameter of the circle is 4 cm x 2, or 8 cm. If you know the circumference of the circle, divide it by π to get the diameter.
What is Earth’s radius Class 9?
The radius of the earth is about 6370 km.
What is the radius of the earth Class 7?
The radius of the earth is 6371 km.
How to calculate radius?
The radius of a circle from diameter: if you know the diameter d , the radius is r = d / 2 .
What is the easiest way to find the radius?
How did humans measure the earth?
The Greek philosopher Aristotle (384-322 B.C.) is credited as the first person to try and calculate the size of the Earth by determining its circumference (the length around the equator) He estimated this distance to be 400,000 stades (a stadia is a Greek measurement equaling about 600 feet).
How did scientists calculate the radius of Earth?
During the 3 century, B.C. Eratosthenes was able to mathematically calculate the diameter of the earth by comparing the difference in the angle of the sun’s rays at different geographic points. He was the first person that was able to calculate the radius of the earth.
What is the calculation of Earth?
The formula for calculating the circumference of a sphere is 2 x pi x radius. So, the radius of the Earth is 6371 km. Plug that into the formula, and you get 2 x 3.1415 x 6378.1 = 40,074.
What has 1/4 the diameter of Earth?
Earth’s moon is 2,159 miles (3,474 km) wide, about one fourth of Earth’s diameter.
How is Earth’s orbital radius calculated?
Kepler’s Third law can be used to determine the orbital radius of the planet if the mass of the orbiting star is known (R3=T2−Mstar/Msun, the radius is in AU and the period is in earth years).
How do you find radius formula?
- The radius of a circle from the area: if you know the area A , the radius is r = √(A / π) .
- The radius of a circle from circumference: if you know the circumference c , the radius is r = c / (2 * π) .
- The radius of a circle from the area: if you know the area A , the radius is r = √(A / π) .
- The radius of a circle from circumference: if you know the circumference c , the radius is r = c / (2 * π) .
What is Earth’s radius Class 9?
The radius of the earth is about 6370 km.
What is the easiest way to find the radius?
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