age of diurnal inequality

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The time interval between the maximum semi-monthly north or south declination of the moon and the maximum effect of the declination upon the range of tide or the speed of the tidal current, this effect being manifested chiefly by an increase in the height or speed difference between the two high (low) waters or flood (ebb) currents during the day. The tides occurring at this time are called tropic tides. Also called diurnal age.

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