The average time between two high tides roughly equals the time for a given spot on Earth to rotate so that it is directly under the full Moon.

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Quizplus · Accepted Answer

The average time between two high tides, about 12 hours and 25 minutes, is primarily due to the Earth's rotation and the gravitational pull of both the Moon and the Sun, not just the position relative to the full Moon.

The Average Time Between Two High Tides Roughly Equals the Time