20 18 Oujiang high tide calendar

Tidal schedule of Oujiang River in Wenzhou, Zhejiang Province

Lunar date

Tidal rise

Chaoping

Junior one, sixteen

It's five past six

10:30

The second and seventeenth day of junior high school

half past six

1 1:00

Grade 3 and Grade 18

twenty five past seven

1 1:40

The fourth and nineteenth day of junior high school

Ten minutes to eight

12:20

The fifth day and the twentieth day.

half past eight

13:00

Day 6, Day 2 1 day

nine?o'clock

13:40

The seventh day, twenty-two.

Twenty minutes to ten.

14:30

Eighth grade, 23

10:20

15:20

Day 9 and Day 24

1 1:30

16:30

The tenth and twenty-fifth days.

12:20

17:40

Eleven, twenty-six

13:50

18:40

Twelve, twenty-seven

15:00

19:30

Thirteen, twenty-eight

16: 10

Eight twenty p. m.

Fourteen, twenty-nine

17: 10

2 1: 10

Fifteen, thirty

17:50

2 1:50

1 The tidal cycle is 12 hours and 25 minutes.

Teach you a formula, the error will not be too big. Of course, those far away from the Oujiang estuary will be a little later: the ebb tide time = (lunar calendar -3)*0.8, for example, the ebb tide time on the tenth day of the lunar calendar is about: 7*0.8=5.6, that is, around 5 o'clock (with 17), at noon on the third and eighteenth days (.

The law of seawater fluctuation is: there are two high tides every day, with an interval of 12 hours. The high tide generally lasts for more than an hour before the low tide begins, and the low tide time is at least between the two high tides.

The time of high tide is different every day,/kloc-comes back once every five days. Therefore, the climax of the next day is 0.8 hours (48 minutes) later than that of the previous day, and the daily climax time can be calculated according to the lunar calendar date.

The calculation formula is as follows:

The first to fifteenth day of the lunar calendar: high tide time = date *0.8.

Lunar calendar 16 to 30: high tide time = (date-15)*0.8.

Tide is a natural phenomenon in the coastal areas of China. In ancient times, it was called "Tide" during the day and "Sunseeker" at night, both of which were called "Tide". It is caused by the attraction of the sun and the moon to the earth. It also corresponds to the traditional lunar calendar in China. On the first day of each month (15, 16) of the lunar calendar, that is, the new moon, the sun and the moon are both on one side of the earth, so the tidal force is the greatest, which will cause the "spring tide". When the phases of the moon are the first quarter moon and the second quarter moon, that is, the eighth and twenty-third days of the lunar calendar, the tidal force of the sun and the tidal force of the moon cancel each other out, so there is a "small tide". Therefore, there is a "high tide on the fifteenth day of the first day" in Rizhao agricultural proverbs; On the eighth and twenty-third days, I saw that the beach was full of "harmony". On the first day, the fifteenth (dawn) was full. I worked hard and slowly; On the twenty-third of the eighth day, I work two times a day (morning and evening). Because the moon moves eastward more than 13 degrees on the celestial sphere every day, which is about 50 minutes in total, that is, the transit time of the moon (1 lunar day =24: 50) is delayed by about 50 minutes every day, (there will be tides at the next transit, usually twice a day), so the time of high tide is also delayed by about 50 minutes every day.