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1825 LIVERPOOL Waterfront ~ No.5

 

I had intended to carry out another wander round the docks, but spotted this notice pinned to a board at the Docks entrance. Thought you might be interested:-


_______________________________________________________
 MOON'S AGE                       TIME OF HIGH WATER
_______________________________________________________
 
Days       Days                    
 1          16                    5 past 12 o'clock
 2          17                      52        12
 3          18                      40         1
 4          19                      27         2
 5          20                      15         3
 6          21                       3         4
 7          22                      51         4
 8          23                      39         5
 9          24                      27         6
10          25                      15         7
11          26                       3         8
12          27                      51         8
13          28                      39         9
14          29                      27        10
15          30                      15        11
_________________________________________________

The day of the month answering to the age of the moon, may be found by any common almanack.
The height of the spring tides varies from about 17 feet to 21 feet; on particular occasions they rise 3 or 4 feet higher.
When the sun and moon are both nearest the earth, the tides are at a maximum; and especially if the wind blow in the direction of the tide.
A combination of these circumstances will sometimes accelerate the coming of the tide nearly an hour. Contrary effects will retard it by a like interval.
Other circumstances being the same, the tides augment and diminish with the moon's parallax, but in a greater ratio.

Note: If from the time of high water at London, given in White's Ephemeris, 3h. 25m. be subtracted, it will give the time of high water at Liverpool
W. Marrat.

 


I always thought that I was reasonably well educated, but this notice has bemused me completely. I had hoped to have another look at it when I went to look at some more Sailing Ships, but we had a heavy thunder storm which ripped the notice off the board ~ so we will never know how to work the tides out! The one thing that does bother me is that I always thought a lunar month was 28 days. If the table refers to a calendar month, were is day 31?
Enough of this it's taxing the little grey cells!