Find 20 13 tidal table of Xiasha in Changle, Fuzhou.

(Grade One, Sixteen) 0: 00 6:1212: 2418: 36

(Grade two,17) 0: 48 7: 0013:1219: 24.

(Grade 3, 18th)1:36 7: 4814: 00 20:12

(Grade 4,19) 2: 24 8: 3614: 48 21:00

(Grade 5, 20) 3:129: 2415: 3621:48

(Grade 6, No.2 1) 4: 0010:1216: 24 22: 36

(Level 7, 22) 4: 4811:0017:12 23: 24

(Grade 8, Grade 23) 5: 3611:4818: 000:12

(September 24th) 6: 2412: 3618: 481:00.

(10, 25th) 7:1213: 2419: 361:48

(XI, XXVI) 8: 0014:12 20: 24 2: 36

(12, 27) 8: 4815: 00 21:123: 24

(XIII, XXVIII) 9: 3615: 48 22: 00 4:12

(14, 29)10: 2416: 36 22: 48 5: 00

( 15, 30) 1 1: 12 17: 24 23: 36 5: 48

At 0: 00 a.m. and 12: 00 a.m. on the first and fifteenth day of junior high school, the tide level rises to the highest and is low at six o'clock. Then the time of high tide and low tide is delayed for 48 minutes every day.

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.

Changle high tide calculation formula is as follows:

The first to fifteenth day of the lunar calendar: climax time =0.8h×[ lunar date-1]+ climax interval.

Lunar calendar 16 to 30: high tide time =0.8h×[ lunar calendar date-16]+ high tide interval.

The climax interval is calculated as 2 minutes.

The seaside is a good place for swimming and leisure in summer, but before swimming, we'd better know about the weather and tidal fluctuation time at the seaside. At low tide, we'd better not swim in the water, it's easy to roll out with the sea water and it's difficult to swim back.

Pay attention to tidal fluctuations and swim safely! ! ! ! ! The above information is for reference only, please forgive me for the shortcomings! ! ! !