The Earth spins once per day. The Moon spins once per month (approximately). The Moon's surface gravity is 1/6 of the Earth's, despite the 1/30 ratio of the rotation rates.Spin , the faster the spin along with density of the medium , the stronger the gravity . Gravity has direction because of rotation .
Show me your derivation of the surface accelerations due to gravity on the Earth and Moon, based on their spins, please.
Or retract your claim that spin causes gravity.
How is the direction of gravity on the Earth's surface related to the rotation of the Earth?Sure but gravity has also direction. Without rotation gravity has no direction.
At the south pole, gravity points towards the centre of the Earth. At the north pole, gravity points in the exact opposite direction (still towards the centre of the Earth). At the equator, gravity points at right angles to its directions at the north and south poles.
Show me how you derive the direction of gravity on the Earth's surface from the spin.
Or retract your claim that the direction of gravity is related to spin.