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What causes tides? The gravitational interactions!

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Feb - 12 - 2011
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“Language exerts hidden power, like the moon on the tides.” This old quotation itself denotes the moon’s effect on tides. “Tide” is the generic word used for the process of periodic raise and fall of the sea level with respect to land. The gravitational pull of the Moon on the Earth causes bulges on the ocean. The gravitational interaction of the Earth and the Moon create a bulge in the direction of the moon. Meantime, another bulge takes place on the opposite direction.


Sir Isaac Newton is the first person to explain the causes of high tide and low tide. During day time the Earth rotates 180degree in 12 hours while the moon 6 degree rounds the Earth in 12 hours. These two bulges on the Earth by moon’s rotation cause a high tide every 12 hours. During the day, the Earth rotates 180 degrees in 12 hours. The moon, meanwhile, rotates 6 degrees around the earth in 12 hours. The twin bulges and the moon’s rotation mean that any given coastal city experiences a high tide every 12 hours and 25 minutes or so.

Lunar tides: Just as magnets the Earth and the Moon are attracted each other. The Moon tries to pull everything towards it while the Earth has the ability to hold onto it except bodies, because water is always in motion. The ocean level always fluctuates according to the effects of the Sun and the Moon on them.
Spring tides: Spring tides occur when the Sun, the Moon and the Earth come in the same line. The gravitational interactions of the Moon and the Sun affect the tide. Spring tide occurs during the new Moon and the full Moon.
Proxigean Spring Tide: This tide happens very rarely when the Earth and the Moon are very close to each other called proxigee. It occurs once in one and a half years.
Neap tides: These are weak tides and occur when the gravitational pull is perpendicular.

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