Why Are High Tides at Different Times?
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Why tides are higher lower at certain times of the year?
Tides are long-period waves that roll around the planet as the ocean is "pulled" back and forth by the gravitational pull of the moon and the sun as these bodies interact with the Earth in their monthly and yearly orbits. ... This means that high tides are a little higher and low tides are a little lower than average.
Why do the heights of the high and low tides fluctuate over time?
Tides are the alternating rise and fall of the sea surface. They are due mainly to the gravitational attraction (pull) of the moon and sun on the rotating earth. Two high and two low tides occur daily around Britain and, with average weather conditions, their movements can be predicted with considerable accuracy.