Lessons in Astronomy Including Uranography a Brief Introductory Course Without
Lessons in Astronomy Including Uranography a Brief Introductory Course Without
Charles a Charles Augustus Young
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152 DEFINITIONS. [ 209 209. The tides consist in a regular rise and fall of the ocean surface, the average interval between corresponding high waters on successive days at any given place being twenty- four hours and fifty-one minutes, which is precisely the same as the average interval between two successive passages of the moon across the meridian ; and since this coincidence is main- tained indefinitely, it of itself makes it certain that there must be some causal connection between the moon... and the tides. Some one has said that the odd fifty-one minutes is the moon's " ear mark. " That the moon is largely responsible for the tides is also shown by the fact that when the moon is in perigee, at the nearest point to the earth, the tides are nearly twenty per cent higher than when she is in apogee. 210, Definitions. While the water is rising, it is flood tide ; while falling, it is ebb tide. It is high water at the moment when the water level is highest, and low water when it is lowest.
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