A: Differences between succesive high tides and succesive low tides occur each lunar day. Since these differences occur within a period of one day, they are called diurnal(daily) inequalities. These inequalities are at their greatest when the moon is at its maximum declination, and such tides are called tropical tides because the moon is over one of the tropical regions. When the moon is over the Equator, the inequality is experienced within the tidal pattern is minimal; tides with this charasteristic are called equatorial tides

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