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The moon pulls the ocean on the near side of the earth more than it pulls on the center of the earth. The pull on the ocean at the far side of the earth is smaller still. This causes the near ocean to accelerate toward the moon most, the center of the earth less, and the far ocean still less.
Ocean tides have 4 causes: 1  The gravitational force difference between the Moon and the Earthâs surface, versus the Moon and Earthâs center of mass. 2  The gravitational force difference between the Sun and the Earthâs surface, versus the Sun and Earthâs center of mass. Centripetal forces on the Earthâs surface, due to itâs orbital motion with respect to the Moon and Sun. The geography of Earth, which amplifies the tides in specific areas (see map below).