Solar system

The moon and the tides: a sea that rises and falls

The moon and the tides: a sea that rises and falls

The tides are rising and falling from sea level that occur several times a day. They change with the moon phases, but NOT due to the way the Moon appears. We enter into matter ...

The gravity of the Sun and, above all, that of the Moon, attract water from the oceans and its influence causes the tides. Where the tide is most noticeable is on the beaches, the better the plains, since the coastline can move forward or backward many meters.

The Moon attracts the water that is closest to it. Thus, the part of the ocean facing the Moon is bulging towards it. At its point of maximum height it is called high tide and in the minimum, low tide

The tides are produced by a gravitational imbalance that decompensates the oceans throughout the planet. The moon does not "pull the water" up; If so, there would also be tides in the ponds, lagoons and swimming pools.

The tides not only occur on the Earth's side facing the Moon; on the opposite side, water is bulging in the opposite direction. Why? By inertia. The Moon attracts the entire Earth, in addition to water. What happens is that the earth is rigid and does not bulge. The inertia resists gravity and pulls in the opposite direction. That is why the ocean on the other side of the Earth is also bulging, although less. The swelling of the ocean makes it possible to see how the sea water withdraws and returns several times a day on the coast.

The Sun also attracts water from the seas and oceans, but to a lesser extent than the Moon. Although its severity is greater, being further, it influences less. The sun produces weaker tides.

The tides do not always occur at the same time, every day. They vary with the moon phases, since the Moon appears in the sky at different times. The fishermen and the people of the sea are interested in knowing what days there is a moon change. They also follow the movements of the Moon in coastal tourist places. For example, it is essential to know the tide schedule to visit the Beach of the Cathedrals on the coast of Lugo, Galicia.

The height of the tides also varies, and is not the same in all places. In the growing and waning phases, they are smaller and are called dead tides. On the other hand, when there is a new or full moon, the sun, moon and earth align, and the tides are higher. Called spring tides. High tides are then very high and low tides are very low.

The liveliest tides occur on the new Moon, since the gravity of the Moon and the Sun pull in the same direction, and add up.

Discover more:
• The phases of the moon
• Seas and oceans of the Earth
• Tides according to Wikipedia


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