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How Do Tides Change Twice Every Day?

How Do Tides Change Twice Every Day?

潮汐为什么每天变化两次?

  1. The Moon’s gravity pulls ocean water toward it most strongly.
  2. Water bulges on the side of Earth nearest the Moon.
  3. A second bulge forms on the opposite side due to inertia.
  4. As Earth rotates, any coast passes through both bulges daily.
  5. High tide happens about every 12 hours and 25 minutes.
  6. Low tide occurs halfway between two high tides.
  7. Sun gravity adds or reduces effect depending on Moon phase.
  8. Tide charts help sailors, fishers, and coastal builders plan safely.
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