Yes, the Earth's spin does have an effect on the distribution of gravity along the equator. This is because the centrifugal force created by the Earth's rotation is stronger at the equator than at the poles, and this force partially counteracts the force of gravity. As a result, objects at the equator weigh slightly less than they would at the poles.

However, it's important to note that this effect is relatively small. The difference in weight between an object at the equator and an object at the poles is only about 0.5%, which is not noticeable to most people. Additionally, the Earth's shape, including its oblateness and other irregularities, also plays a role in the distribution of gravity.

Overall, the effect of the Earth's spin on gravity along the equator is just one factor among many that determine the planet's shape and behavior. Even if the Earth were not round, it would still be subject to the forces of gravity and other physical laws, which would shape its structure and behavior in unique ways.
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