"The moon waxes and wanes", the sea has its ebb and flow, and the water in the sea rises and falls on time every day. In ancient times, people called the rise and fall during the day "tide", and the rise and fall at night as "tide". Together they were called "tide". Tidal phenomena cause regular rises and falls of the sea surface, just like human breathing. When the sea water rose, I saw the water head galloping from afar like a horse, in the blink of an eye, the water filled the bay and the waves crashed on the shore, making a thunderous roar and spraying foam. . When the tide goes out, the landscape is different. I saw the sea water gradually falling, and in an instant, the golden sand bottom covered by the sea water and the strangely shaped rocks were revealed.
Why does the tide move day and night and again and again? What strength riseser and descend sea water so regularly? Many scientists in ancient China discovered through long-term observations that the phenomenon of ocean tides is closely related to the waxing and waning of the moon. Tides are caused by the gravitational pull of the sun and moon on sea water. According to the law of universal gravitation, there is a mutual attraction between two objects; the magnitude of the gravitational force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
The tidal force of various locations on earth changes with the distance between locations and moons. Additionally, the earth is constantly rotating and changing at all times. Therefore, different locations experience tidal fluctuations of different sizes at different times.