TIDES. [Lesson xxxi. 



produce a greater tide, the time of high water is 

 retarded. 



The greatest Spring Tide will happen when the 

 moon is in perige, if other things are the same : 

 and the succeeding Spring Tide, when the moon is 

 in apogc, will be least. But because the. earth is 

 nearer the sun in winter than in summer ; and the 

 effect of a luminary is also greater, the nearer it ap- 

 proaches to the plane of the equator ; the greatest 

 Spring Tides, and the least Neap Tides, will gene- 

 rally happen immediately after the autumnal and 

 before the vernal equinox. 



In places remote from the equator, the two im- 

 mediately succeeding Tides are unequal, whenever 

 the luminary declines from the equator. Thus it is 

 observed, that the evening tides in summer exceed 

 the morning Tides ; and the contrary, in winter. 

 For, if the greatest elevation immediatelyunder the 

 luminary points to one side of the equator, the op- 

 posite greatesfelevation points as much to the other 

 side. And those places, which are on the same 

 side of the equator with the luminary, approach 

 nearer to the greatest elevation, when the luminary 

 is above the horizon, than to the greatest opposite 

 elevation, when the luminary is below the horizon. 



This inequality is greatest, when the sun and 

 moon have the greatest declination. It is also 

 greatest in places most remote from the equator. 

 The nearer the place approaches to the poles, the 

 farther it is removed from the greatest elevation on 

 the opposite side of the equator. Thus the less 



Tide 



