SOLAR SYSTEM

Detailed explanation-1: -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. Eratosthenes was measuring the polar radius, and his value (using the 0.15 km/stadium conversion) lies between the polar and equatorial values.

Detailed explanation-2: -A real radius is the radius of a sphere of equal surface area (R2). Volume radius is the radius of a sphere that has the same volume as an ellipsoid (R3). All three values are approximately 6, 371 kilometres (3, 959 miles). Other methods of defining and measuring the radius of the earth include the radius of curvature.

Detailed explanation-3: -The radius of Earth at the equator is 3, 963 miles (6, 378 kilometres), as per NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Detailed explanation-4: -Solution: The radius of the earth at the poles is 6357 km, and the radius at the equator is 6378 km. The percentage change in the weight of the body when it is taken from the equator to the poles is 0. 7%.