Does anyone know the schedule of high and low tides?

Sea water fluctuates periodically, for example, there are two big tides and two small tides every day. Through long-term practice and observation, it is found that Rigao Lake mostly appears before and after the mid-day of the moon (that is, when crossing the local meridian). The low tide time is before and after the moon rises and falls, and the daily high (low) tide time is about 48 minutes every night, that is, 48 minutes (0.8 hours) every night. Every month, there are two big tides near the first and fifteenth day of the lunar calendar, and two small tides near the seventh, eighth, twenty-second and twenty-third day of the lunar calendar. But in fact, the formation time of high tide and low tide is not exactly the above time, because the shape of the earth is very complicated, so the maximum tide and minimum tide appear a few days later than the theory. For example, the fluctuation of the third and eighteenth tides along the coast of Shandong Peninsula is the largest, while the fluctuation before and after the tenth, 22nd and 25th is the smallest.

Method one

1, the lunar calendar date is less than 15:

High tide time = lunar calendar date ×0.8

Low tide time = Lunar date ×0.8-6

2, the lunar calendar date is greater than fifteen:

High tide time = (lunar date-15) × 0.8;

Low tide time = (lunar date-15)×0.8-6.

The calculated time is 12 hour.

Method 2

1, the climax time of the day:

Calculation method of the first half month: (Lunar date-1) × 0.8+5.7 = high tide time.

Calculation method of the second half of the month: (Lunar date-16) × 0.8+5.7 = high tide time.

2, tomorrow's high tide time calculation method:

Today's high tide time +48 minutes = tomorrow's high tide time.

explain

Suppose the daily high tide time is 8 o'clock today, then the high tide time tomorrow is 8: 48.

Tides in Rizhao sea area are regular semidiurnal tides, with two high tides a day. The interval between the two high tides is 12 hours and 24 minutes, and the interval between the highest and lowest tides is 6 hours.

It's all from the internet. I'm not sure. I hope it helps you.

/search? Source = igchina & ampHL = zh-CN & amp； rlz = 1g 1 gglq _ ZH-cncn 3 16 & amp； q = % E6 % B6 % A8 % E6 % BD % AE % E4 % B8 % 8E % E9 % 80% E6 % BD % AE % E6 % 97% B6 % E9 % 97% B4 & amp； Google+%E6% 90% 9c% E7% B4% A2&; aq = f & ampoq=