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Updated: May 8, 2025
The law for expressing the efficiency of a tide-producing agent varies not according to the inverse square, but according to the inverse cube of the distance. This difference in the expression of the law will suffice to account for the superiority of the moon as a tide-producer over the sun.
Now, as eight is the cube of two, this illustration may be taken as a verification of the law, that the efficiency of a body as a tide-producer varies inversely as the cube of the distance between it and the body on which the tides are being raised.
It must be noticed that the influence of the tidal friction is not directed to the total annihilation of the rotation of the two bodies affected by it; the velocity is only checked down until it attains such a point that the speed in which each body rotates upon its axis has become equal to that in which it revolves around the tide-producer.
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