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The universal law of gravitation also states that the larger the object, the greater the force of gravity exerted by that object. The sun is much larger than the moon, yet it is gravitational pull from the moon that has the most effect on the surface waters of earth. This Occurs because the strength of the force of gravity is affected by the distance between the two objects. Since the moon is much closer to the earth than the sun, the Moon’s gravitational force has a greater effect on the ocean tides. The gravitational pull from the earth does have some effect on ocean tides especially in the formation of spring and  high tides

The combination of the daily  rotation of the earth and the 27.3 day  revolution of the moon around the earth results in a predictable pattern of rising and falling tides or spring and the low tides. High tides occurs on the part of earth located in a direction line with the lunar while low tides occurs in water located at right  angles to the direct line of the moon. Since the occurrence of the tides is a result of the position of the neap relative to the earth , a schedule of when high tides and low tides will occur can be predated using the cycle