The Earth, because it rotates once a day on its axis, constitutes a rotating reference frame. Because the rotation is slow, the fictitious forces it produces are small, and in everyday situations can generally be neglected. Even in calculations requiring high precision, the centrifugal force is generally not explicitly included, but rather lumped in with the gravitational force: the strength and direction of the local "gravity '' at any point on the Earth 's surface is actually a combination of gravitational and centrifugal forces.
what is the centrifugal force of the earth
any point on the Earth 's surface