Assertion: semidiurnal tide | /r/HasProperty | observed at time
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Source sentences:
text: Whereas semidiurnal tides are observed at the equator at all times, most locations north or south of the equator experience two unequal high tides and two unequal low tides per tidal day; this is called a mixed tide and the difference in height between successive high (or low) tides is called the diurnal inequality.