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🌊 How tides are driven by the Moon

Follow the Moon’s differential gravity from ocean bulges to local tide tables, and see how the Sun and coastlines reshape the pattern.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Gravity creates a difference across EarthExplain tidal force as the variation in lunar gravity across Earth and connect it to broad ocean bulges.The Moon accelerates Earth as a whole, but its unequal pull across the planet creates the smaller tidal force that stretches ocean water.
Two bulges make a daily cycleTrace how two idealized bulges and Earth’s rotation produce repeating high and low tides.Earth rotates through a two-ended tidal pattern, while the Moon’s orbital motion makes the cycle about 24 hours 50 minutes.
The Sun changes the lunar patternDistinguish spring tides from neap tides by the changing alignment of the Sun, Earth, and Moon.The Sun contributes a smaller tide-raising force that reinforces the Moon at new and full Moon and partly cancels it at quarter phases.
Why every coast has its own tideExplain why local tide timing and height depend on ocean-basin geometry as well as astronomy.Continents, depth, friction, resonance, rotation, and weather transform a global lunar forcing pattern into each coast’s local tide.

Questions this course answers

What creates the Moon’s tide-raising force?

The tidal force is the variation in the Moon’s gravitational pull across Earth, after the shared acceleration of the whole planet is removed.

Why are there two idealized high-tide bulges?

The near side is pulled more strongly toward the Moon, while the far-side water lags behind Earth’s stronger motion toward the Moon.

Why does the time of high tide usually shift later each day?

A location needs extra rotation to line up with the Moon’s new position, making the lunar cycle about 24 hours 50 minutes.

When do spring tides occur?

New and full Moon put the Sun, Earth, and Moon near one line, producing the largest tidal ranges.

Why can two nearby coasts have different tide schedules?

Local ocean geometry and dynamics determine how the same astronomical forcing appears at each shore.

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