## Radius of Earth in Physics

The symbol R? stands for the radius of the Earth. The radius of our planet, The Earth, is the distance from the centre of the Earth to a point on or near its surface, and it ranges from nearly 6,378 km to nearly 6,357 km, approximating the figure of Earth by an Earth spheroid.

Furthermore, in astronomy and geophysics, a nominal Earth radius is sometimes employed as a unit of measurement.

6,371 kilometres is commonly used as a global average value.

The radius of curvature is another approach to define and measure the Earth radius, and some definitions produce results that are outside the range between polar and equatorial radius because they include local or geoidal topography. Another reason could be that they are based on abstract geometrical ideas.

## Radius of Earth in Kilometers

Those who have had the pleasure of jet-setting or flying around the world know that the world is a huge place, but the diameter of the Earth adds a little complexity to the equation. We’ve all wondered how huge the world is from one end to the other at some point. Furthermore, because the Earth is not perfectly spherical, it fluctuates depending on where you measure from. When measured from the poles, it has a different diameter than when measured at the equator.

Scientists have discovered that the Earth is not a perfect sphere and is instead an “oblate spheroid,” according to an area of mathematics concerned with its measurement.

At the poles, the Earth flattens out by 0.0033528. The rotational velocity of the Earth causes the planet to bulge at the equator, resulting in this flattening.

The diameter of the Earth near the equator is around 43 kilometres bigger than the diameter of the Earth from pole to pole. According to the most recent data, the Earth’s equatorial diameter is 12,756 kilometres. The earth’s polar diameter is 12713.6 kilometres.

Items positioned near the equator are about 21 km further distant from the Earth’s centre than objects placed at the poles, to put it simply. As a result, there are some aberrations in local topography where items positioned distant from the equator are closer or farther away from the Earth’s core than objects located closer to the equator.

## Radius of Earth Orbit

The mass of the Earth can be calculated using Newton’s law of gravitation, which would be due to the total (F), which is equal to the gravitational constant multiplied by the planet’s mass and the mass of the object, divided by the square of the planet’s radius. We set this equal to the fundamental equation, force (F) equals mass (m) multiplied by acceleration (a), and since the acceleration due to gravity is 9.8 m/s2, the gravitational constant (G) is 6.673 × 10−11 Nm2/kg2, the radius of the Earth is 6.37 × 106 m, and mass cancels out, we arrive at 5.96 × 1024 kg as the answer for the mass of the Earth.

Earth is the third planet from the Sun and barely a speck in the vastness of space. It is, nevertheless, the home of humans and all other known life. Animals, plants, and other species can be found practically everywhere on Earth’s surface, despite its fifth-largest size. Its mass is estimated to be 5.98 × 1024 kg. A characteristic that is inherent in mass. It is unaffected by the object’s surroundings or the measurement method. It’s a scalar quantity, which means it’s a single value in the proper unit with no direction.

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## FAQs on what is the radius of the earth?

### What is the earth’s radius?

The radius of the Earth is 6563 kilometres, according to data collected by 183 high school classrooms as part of a World Year of Physics project.

### What is the Earth’s age, and how old is it?

The Solar System and Earth are both 4.54 billion years old, which is consistent. The age of the Milky Way Galaxy is estimated to be 11 to 13 billion years old, whereas the age of the Universe is estimated to be 10 to 15 billion years old.

### Who was the first to calculate the Earth’s radius?

B.C. Eratosthenes was the first person to mathematically calculate the diameter of the earth by comparing the difference in the angle of the sun’s rays at different geographic points during the 3rd century B.C. Eratosthenes was the first person to calculate the radius of the earth by comparing the difference in the angle of the sun’s rays at different geographic points during the 3rd century B.C. Eratosthenes was the first person to calculate the

### Who was the first to discover the Earth?

The Earth was never technically ‘found,’ because it was never an unknown entity to mankind, and its position in the Solar System was accurately represented in Aristarchus of Samos’ heliocentric model.

### Is the earth’s radius the same everywhere?

No, the earth’s radius isn’t the same everywhere. The radius of the Earth is 6,356 kilometres at the poles and 6,378 kilometres at the equator.