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

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

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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 / Phase Inequality: Variations in the tides or tidal currents due to changes in the phase of the Moon. At the times of new and full Moon the tide-producing forces of the Moon and Sun act in conjunction, causing the range MORE

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 / 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

Science / Tides and Currents / Annual Inequality: Seasonal variation in water level or current, more or less periodic, due chiefly to me teorological causes. 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