That state of the tides when they have flowed to the greatest height, in which state they remain nearly stationary for about fifteen or twenty minutes, when the water begins to ebb. The time of high-water is always nearly the same in the same place at the full of the moon; and at all other times the time of high-water depends upon the age of the moon; the rule for finding which, the age of the moon being given, is as follows: viz. Add four-fifths of the moon's age, as so many hours, to the time of high-water at the full of the moon, and the sum is the time of high water answering to that day, nearly.