Tides are ups and downs of sea level due to the influence of the force of attraction between Earth and Moon, the Sun also influences is because not only it but also to force centrifugal caused by the fact that the Earth rotates on its axis. The fact is that talk of a spring tide when aligned Sun-Earth-Moon or Sun-Moon-Earth, where the ups and downs are very diligent, and talked of neap tides when the 3 bodies are at right angles, that happens several times a day.
The first video is not very explanatory but very simple, the second is more complete but longer and heavier to understand, you decide what to see. Do not stand in doubt, watch the two videos ...
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