**Science / Tides and Currents / Inequality:** A systematic departure from the mean value of a tidal quantity. See diurnal inequality, parallax inequality, and phase inequality.

**Inequality Noun Synonyms**: disparity, difference, discrepancy, unevenness, nonconformity, incongruence, incongruity, inconsistency, dissimilarity, imbalance

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Science / Tides and Currents / Variational Inequality: An inequality in the Moon's motion due mainly to the tangential component of the Sun's attraction. MORE

Science / Tides and Currents / Parallax Inequality: The variation in the range of tide or in the speed of a tidal current due to changes in the distance of the Moon from the Earth. The range of tide and speed of the current tend alternately to increase MORE

Science / Tides and Currents / Age Of Phase Inequality: The time interval between new or full Moon and the maximum effect of these phases upon range of tide or speed of the tidal current. This age may be computed from the harmonic constants by the formula: MORE

Science / Tides and Currents / Age Of Parallax Inequality: The time interval be tween perigee of the Moon and the maximum effect of parallax upon range of tide or speed of the tidal current. This age may be computed from the harmonic constants by the formula: MORE

Science / Tides and Currents / Age Of Diurnal Inequality: The time interval between the maximum semimonthly north or south declination of the Moon and the maximum effect of declination upon range of tide or speed of the tidal current. The age may be computed MORE

Science / Tides and Currents / Diurnal Inequality: The difference in height of the two high waters or of the two low waters of each tidal day; also, the difference in speed between the two flood tidal currents or the two ebb currents of each tidal day MORE