I've always wondered where people get the idea that the rotation of the earth has everything to do with gravity.
The earth's mass is responsible for our gravity.
The mass of the sun and moon affect our gravity also and they are a long way from our earth.
A question: what is the rotational speed of the moon?
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Definition of gravity
Physics.
The natural force of attraction exerted by a celestial body, such as Earth, upon objects at or near its surface, tending to draw them toward the center of the body.
The natural force of attraction between any two massive bodies, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.