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How Do Tides Change Every Day?
潮汐为什么会每天变化？
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Tides rise and fall because of the Moon’s gravity pulling Earth’s oceans.潮汐涨落是由于月球引力牵引地球海洋所致。
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The Sun also pulls, but its effect is about half as strong as the Moon’s.太阳也有引力作用，但其影响约为月球的一半。
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Earth rotates once every 24 hours, while the Moon orbits slowly.地球每24小时自转一圈，而月球绕地球公转较慢。
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So most places get two high tides and two low tides each day.因此，大多数地方每天经历两次高潮和两次低潮。
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Tide heights change with Moon phases — highest at full and new moons.潮高随月相变化——满月和新月时最高。
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Coastal shape and ocean depth affect local tide timing and size.海岸形状和海水深度会影响当地潮汐的时间和幅度。
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Tidal energy can even power small electricity generators today.如今，潮汐能甚至可驱动小型发电机发电。
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Understanding tides helps sailors, fishers, and coastal planners.了解潮汐有助于航海员、渔民和沿海规划者。