Lunar Tide

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If the earth were uniformly covered with a layer of water, the passage of the moon over any place as at a, would cause the water to lose its globular form, become bulged at a, and b, and flattened at c, and d. In other words, the water would become deeper at a, and b, at the parts of the earth nearest and farthest from the moon and shallower in all places 90 degrees or at right angles to these points.




Edwin J. Houston, The Elements of Physical Geography, for the use of Schools, Academies, and Colleges. (Philadelphia: Eldredge & Brother, 1891) 76


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