When is the climax of the 20th lunar month?

The climax of the 20th day of the lunar calendar is 4:00 and 16: 24. As for the time of high tide, the tide level drops to the lowest at 6: 00 am and 18: 00 pm every lunar month 15 and 30, and reaches the highest at noon 12: 00 and 0: 00 am, and then the time of high tide and low tide is delayed for 48 minutes every day.

High tide is a natural phenomenon. There are high tides and low tides in seawater. At high tide, the sea rises, the waves roll and the scenery is spectacular. At low tide, the sea receded quietly, revealing a beach. High tide and low tide are generally twice a day.

The fluctuation of sea water is called tide during the day and sunseeker at night, so it is also called tide. China's ancient book says, "The sea is a tide in the morning and a sunseeker at night". There is a period between high tide and low tide when the water level does not rise or fall, which is called flat tide.

Let's talk about tides. Tides are periodic fluctuations of seawater. Because it is tide during the day and sunseeker at night, the fluctuation of seawater during the day is called "tide" and the fluctuation of seawater at night is called "sunseeker". This phenomenon once puzzled the ancients and I don't know what caused it.

Later, careful people found that the tide is delayed for a period of time every day, which is the same as the time when the moon is late every day, so the tide is inevitably related to the moon. The relationship between tides and the moon is mentioned in China's ancient geography book Shan Hai Jing. Wang Chong clearly pointed out in the book "On Balance in the Eastern Han Dynasty" that "Tao rises and falls with the moon".

But it was not until Newton discovered the law of universal gravitation that Laplace mathematically proved that tidal phenomena were indeed caused by the gravity of the sun and the moon, mainly the moon.

The above contents refer to Baidu Encyclopedia-Climax.