If you want to be a master of sea fishing, you must first calculate the tidal time. How to calculate it?

If you want to be a master of sea fishing, you must first calculate the tidal time. How to calculate it?

The duration of tides should be consistent with the time of the mid-day or the lower mid-day of the moon in science, but it is often delayed. Therefore, the time between the climax and the mid-day of the moon is called the climax gap. And the gap between climaxes in different parts of the country is quite different, such as: Weihai is 1: 5, Yantai is 1: 25 and Longkou is 1: 2.

For boat fishing, the duration of tide is of vital practical significance. Without tide, there would be no fish. Therefore, mastering a certain tidal calculation method is beneficial for fishermen to catch a large number of fish. There is a very simple calculation method, which will be described next: the lunar calendar day (the first half of the month -3, the end of the month -18)x.8

is the high tide time of the day, and the low tide time is the high tide time plus 6:12'. For example, the tidal time of the fifth lunar month in Weihai is as follows: the high tide time is ≡(5-3)×.8=1:36' (this is also the first high tide); Low tide =1:36'+6:12'=7:48' (this is also the first low tide). Another example is to calculate the tidal time of the fifth lunar month in Weihai: the high tide time =(25-18)×.8=5:36' (this is also the first high tide).

low tide =5:36'+6:12'=11:48' (this is also the first low tide). Fashion trend will cause the fluctuation of water level regulation, and the fluctuation of this water has a periodic trend; However, under the direct influence of topographic conditions, the sea surface fluidity shows two situations, one is reciprocating and the other is rotating. Among them, the fashion trend that changes periodically in two opposite directions is called reciprocating flow < P > In the coastal area of Shandong Peninsula, it changes to a horizontal sedimentation tank (no flow) about 2 hours before the start of flow, and generally flows to the west about 2 hours before the climax, that is, the fashion trend rises. At this time, the flow speed at the climax is relatively large. It flows to the west about 2 hours after the high tide, and flows to the east about 2 hours before the low tide, that is, it falls into the fashion trend. At this time, the flow speed at the low tide is relatively high, and it flows to the east about 2 hours after the low tide. From the end of the flow to the beginning of the flow, there is about two hours of advection sedimentation tank (no flow), that is, the turning time. Tides are caused by the attraction of the moon and the sun.

One of the most important reasons for tides is actually the law of universal gravitation. Tides are like a complicated physical change, and the key is that the relative positions of the earth, the moon and the sun change at any time, and the resultant force of the attraction of the sun and the moon changes at any time, as well as the rotation of the earth. The sea surface rises and falls regularly every day, and the length and relative height of the rise and fall change periodically. Everyone calls this kind of vertical rise and fall of the sea tide. In fact, the tide is a weather phenomenon in coastal cities, which has long been used to it.