How to calculate the time of high and low tide?

The time of high tide and low tide is different in the first half and the second half, and the calculation method is as follows:

1, from the first day to the fifteenth day of each month, with (lunar date-1)×0.8+5(0 o'clock); From 16 to the end of each month is (lunar date-16)×0.8+5(0: 00).

2. These two formulas can calculate when is the highest tide in a day, and deduce that 6.2 hours is the lowest tide time, and then every 6.2 hours is the high tide time.

3. For example:

Suppose: today is the lunar calendar 15:

Maximum climax time = 15×0.8= 12, that is,12 at noon and midnight;

The lowest ebb time is 6 am and 6 pm.

Close observation time is from 4 am to 8 am and from 4 pm to 8 pm.

Extended data:

1, irregular phenomena of high tide and low tide:

Generally speaking, the tidal range between two tides in a day is not equal, and it is not equal at high tide and low tide. This irregular phenomenon is called the daily inequality of tides.

(1) The high tide is called high tide and the low tide;

(2) Low tide is called low tide and high tide is called high tide.

2. The specific fluctuation time of tides varies from place to place. It mainly depends on the date of the lunar calendar, the local tidal type and longitude. If you carefully observe the local tidal law and refer to the above formula, you can get a local formula for calculating tidal time.

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