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What causes high tide and low tide? Why are there two tides each day? In this diagram, you can see that the moon's gravitational force pulls on water in the oceans so that there are bulges in the ocean on both sides of the planet. The moon pulls water toward it, and this causes the bulge toward the moon. The bulge on the side of the Earth opposite the moon is caused by the moon pulling the Earth away from the water on that side. Up Next. If you are on the coast and the moon is directly overhead, you should experience a high tide.
1 The sun's gravity also produces tides. But since the forces are smaller, as compared to the moon, the effects are greatly decreased.  Tides are not caused by the direct pull of the moon's gravity. The moon is pulling upwards on the water while the earth is pulling downward.