# What is the exact radius of the earth?

## What is the exact radius of the earth?

The radius of Earth at the equator is 3,963 miles (6,378 kilometers), according to NASA’s Goddard Space Flight Center in Greenbelt, Maryland. However, Earth is not quite a sphere. The planet’s rotation causes it to bulge at the equator. Earth’s polar radius is 3,950 miles (6,356 km) — a difference of 13 miles (22 km).

## What is the radius of the earth in meters in scientific notation?

6371km
It is known that the equatorial radius of the earth is R=6371km R = 6371 k m so, convert the unit of radius using the conversion factor.

How is Earth radius measured?

Since the locations are points on a circle that goes around the earth, the distance between them can be expressed as an arc measurement on a 360-degree circle. For Eratosthenes, the arc was 7.2 degrees. Compute the radius of the earth using the formula C (circumference) = 2 x pi x r (radius).

What is the radius of Earth in power?

The Earth’s mean radius is determined as the average distance from the physical center to the surface, based on a large number of samples. The value, symbolized rearth, is equal to approximately 6,371,000 meters (6.371 x 106 m). This is roughly 6,371 kilometers (km) or 3,960 statute miles.

### What is true shape of the earth?

The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis. It is the regular geometric shape that most nearly approximates the shape of the Earth.

### What is the mass of Earth in KG?

5.972 × 10^24 kg
Earth/Mass

Who invented radius?

Eratosthenes of Cyrene
Eratosthenes of Cyrene (/ɛrəˈtɒsθəniːz/; Greek: Ἐρατοσθένης [eratostʰénɛːs]; c. 276 BC – c. 195/194 BC) was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.

What is the radius of Earth Class 7?

The radius of the earth is 6,371 km. Its equatorial radius is 6378 km, but its polar radius is 6357 km – in other words, the Earth is slightly flattened.

#### How 9.81 is calculated?

The acceleration g=F/m1 due to gravity on the Earth can be calculated by substituting the mass and radii of the Earth into the above equation and hence g= 9.81 m s-2.

#### Is value of G actually constant?

In every place of both Earth and the universe, the value of G remains constant. The value of G does not change with a change in the height, and depth from the earth’s surface.

Is the shape of the Earth geoid?

The geoid is a shape like the surface of the Earth. It is a 3-D geometrical shape like an orange. Shapes of this kind are called oblate spheroids, which is a kind of ellipsoid. The geoid, however, is a very special kind of oblate spheroid.

# What is the exact radius of the Earth?

## What is the exact radius of the Earth?

The radius of Earth at the equator is 3,963 miles (6,378 kilometers), according to NASA’s Goddard Space Flight Center in Greenbelt, Maryland. However, Earth is not quite a sphere. The planet’s rotation causes it to bulge at the equator. Earth’s polar radius is 3,950 miles (6,356 km) — a difference of 13 miles (22 km).

## What is the radius of latitude?

The Earth’s equatorial radius a, or semi-major axis, is the distance from its center to the equator and equals 6,378.1370 km (3,963.1906 mi).

What’s the circumference of the Earth at 40 degrees latitude?

30,600 kilometers
Circumference of the Earth at 40-deg North = 30,600 kilometers. Time to complete one Rotation = 24 hours. Speed of Rotation at 40 North = Distance/Time = 30,600 km / 24 hr = 1280 km/hr.

What is the circumference of the Earth at latitude?

Latitude At the Equator (0°):

1° of Latitude (1/360th of the Earth’s Polar circumference) is 110.5743 km (68.70768 miles)
1″ (1 second) of Latitude (1/3600th of 1°) is only 30.7151 m (100.771 feet)
0.1″ (1/10th second) of Latitude (1/36000th of 1°) is only 3.07151 m (10.0771 feet)

### What is the G in physics?

The universal gravitational constant (G) relates the magnitude of the gravitational attractive force between two bodies to their masses and the distance between them. Its value is extremely difficult to measure experimentally.

### Who named the planet Earth?

All of the planets, except for Earth, were named after Greek and Roman gods and godesses. The name Earth is an English/German name which simply means the ground. It comes from the Old English words ‘eor(th)e’ and ‘ertha’. In German it is ‘erde’.

How do you find the radius of a circle with latitude?

Therefore, before we start the arc length calculation, we need to find the radius of the parallel of latitude. The formula is: = 6400cos( ) where is the angular measurement of latitude.

How fast is the earth spinning?

roughly 1,000 miles per hour
The earth rotates once every 23 hours, 56 minutes and 4.09053 seconds, called the sidereal period, and its circumference is roughly 40,075 kilometers. Thus, the surface of the earth at the equator moves at a speed of 460 meters per second–or roughly 1,000 miles per hour.

## 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.

## 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 12,756km at the equator and 12,714km from pole to pole. We round this up to 13,000km.

What is the length of Earth?

Student Features

Planets: Earth Mars
Distance across* 12,800 km or 7,900 miles 6,800 km or 4,200 miles
Atmosphere Nitrogen Oxygen Carbon Dioxide
Moons 1 2
Rings 0 0

How to calculate the radius of the Earth by latitude?

Earth Radius by Latitude Calculator. For this calculation, the longitude isn’t needed. Mathematically, Earth is a spheroid. Earth radius at sea level is 6378.137 km (3963.191 mi) at the equator. It is 6356.752 km (3949.903 mi) at the poles and 6371.001 km (3958.756 mi) on average. The height above sea level of the location is added.

### How tall is the Earth radius at the Poles?

It is 6356.752 km (3949.903 mi) at the poles and 6371.001 km (3958.756 mi) on average. The height above sea level of the location is added. Please enter the latitude in decimal degrees, here you can convert coordinates. Height above sea level can be negative, then you are below sea level.

### Is the radius of the earth constant at the equator?

Therefore, the Earth radius isn’t constant, but it can be calculated for every location. For this calculation, the longitude isn’t needed. Mathematically, Earth is a spheroid. Earth radius at sea level is 6378.137 km (3963.191 mi) at the equator. It is 6356.752 km (3949.903 mi) at the poles and 6371.001 km (3958.756 mi) on average.

What is the radius of the Meridian called?

The radius used for the latitude change to North distance is called the Radius of Curvature in the meridian. It is denoted by R M, or M, or several other symbols. It has no good physical interpretation on a figure. It is the radius of a circle that fits the earth curvature in the North -South (the meridian) at the latitude chosen.