Why Don’t We Feel the Earth Spinning? The Physics Explained

Short answer: we don't feel the Earth spinning because it turns at a perfectly steady rate, and our bodies only feel changes in motion, not motion itself. Everything around us (the ground, the air, the oceans and you) moves together at the same speed, so there is nothing to push against you. The only trace of the rotation you could notice is a tiny outward effect that makes you about 0.3% lighter at the equator.

Right now, if you are reading this in New York, you are moving eastward at roughly 1,270 km/h (790 mph), faster than a passenger jet. At the equator it is about 1,670 km/h (1,040 mph). And you feel absolutely nothing. Here is why, and how physicists proved the Earth is turning anyway.

How fast is the Earth spinning?

The Earth makes one full turn every 23 hours and 56 minutes. A point on the equator travels the whole circumference, about 40,075 km, in that time, which gives the 1,670 km/h figure. Closer to the poles, you travel a smaller circle in the same time, so your speed drops:

• Equator: about 1,670 km/h (1,040 mph)
• New York (40.7°N): about 1,270 km/h (790 mph)
• London (51.5°N): about 1,040 km/h (650 mph)
• North Pole: zero, you just turn on the spot once a day

And that is only the spin. The Earth also orbits the Sun at about 107,000 km/h (67,000 mph), and the whole Solar System circles the centre of the Milky Way at roughly 800,000 km/h. None of it can be felt.

Why your body cannot feel steady motion

Think of a smooth flight. Once the plane reaches cruising altitude, you can pour a drink, walk down the aisle or drop a coin, and everything behaves exactly as it would on the ground, even though you are moving at 900 km/h. You only notice the plane's motion during take-off, landing and turbulence, when its speed or direction changes.

Galileo used the same argument in 1632, imagining a closed cabin below deck on a ship sailing smoothly: butterflies, fish in a bowl and dripping water all behave normally, and nobody inside can tell whether the ship is moving. This idea became one of the pillars of physics: the laws of nature are the same for anyone moving at a constant velocity. Einstein later built his theory of relativity on it (more on this in our article Special Relativity: Why Time Is Not What You Think It Is).

Your body works the same way. The balance organs in your inner ear detect accelerations: speeding up, slowing down, or starting to turn. The Earth's rotation is incredibly smooth and slow in terms of turning: about 0.004 degrees per second. That is far too gentle and too steady for your inner ear to register.

Why doesn't the air blow us away?

If the ground moves at 1,670 km/h, why isn't there a permanent 1,670 km/h wind? Because the atmosphere rotates with the Earth. Gravity holds the air in place, and friction with the ground has dragged it along for billions of years. Relative to you, the air is mostly still. The winds we do feel come from temperature and pressure differences, not from the rotation itself.

Is there any effect of the rotation we can feel?

Yes, a very small one. Moving in a circle requires a force pulling you toward the centre. At the equator, part of gravity is "used" for this, so you weigh slightly less. The effect is about 0.35% of gravity: a person who weighs 70 kg at the North Pole would weigh roughly 69.75 kg at the equator from this effect alone. Add the fact that the Earth bulges at the equator, putting you farther from its centre, and the difference reaches about 0.5%.

That is real and measurable with a precise scale, but far too small to notice in daily life.

How do we know the Earth is really spinning?

If we cannot feel it, how can we be sure? Several experiments and observations prove it directly.

1. Foucault's pendulum

In 1851, the French physicist Léon Foucault hung a 28 kg ball from a 67-metre wire under the dome of the Panthéon in Paris. A pendulum keeps swinging in the same plane, but over the hours, the plane of its swing slowly turned relative to the floor. The pendulum was not turning: the building, and the Earth under it, were. In Paris, the swing completes a full turn in about 32 hours. At the North Pole, it would take one day; at the equator, it would not turn at all. Foucault pendulums are still on display in science museums around the world.

2. The Coriolis effect

On a rotating planet, anything moving over long distances appears to curve: to the right in the Northern Hemisphere, to the left in the Southern Hemisphere. This is why hurricanes spin counterclockwise north of the equator and clockwise south of it. Long-range artillery and missiles must correct for it too.

A popular myth: no, the Coriolis effect does not decide which way your sink or toilet drains. It is far too weak at that scale; the shape of the basin and the way the water was poured matter much more.

3. Satellites and GPS

Satellite navigation systems must account for the Earth's rotation in their calculations, along with Einstein's relativity, or positions would drift. We explain the relativity part in Lost in Space: Why Your GPS Needs Einstein to Work.

4. The flattened Earth

The spin makes the Earth bulge at the equator: its equatorial diameter is about 43 km larger than its pole-to-pole diameter. A non-rotating planet would be almost perfectly round.

What would happen if the Earth suddenly stopped spinning?

This is where the rotation would suddenly become very noticeable. The ground would stop, but the atmosphere, the oceans and everything not anchored to the rock would keep moving east at up to 1,670 km/h. The result would be winds and waves far more destructive than any hurricane in history. Fortunately, no known process could stop the Earth abruptly.

What does happen is a very slow slowdown: the Moon's tides act like a brake, and the day grows longer by about 1.7 milliseconds per century. Hundreds of millions of years ago, a day lasted only about 22 hours.

Frequently asked questions

Why don't we fly off the Earth if it spins so fast?
Because gravity is about 300 times stronger than the outward effect of the rotation, even at the equator. The Earth would need to spin about 17 times faster for objects at the equator to start floating away.

Do we feel the Earth orbiting the Sun?
No, for the same reason: the orbit is almost perfectly smooth. The Sun's gravity also pulls on you and on the Earth equally, so you fall around the Sun together.

Is the Earth's rotation speed constant?
Almost. It slows down very slowly because of the tides, and it changes by tiny fractions of a millisecond because of earthquakes, ocean currents and the movement of the atmosphere. Atomic clocks can measure these variations.

Could we feel it if the Earth spun faster?
Only if it spun much faster. With a day of about 1 hour and 25 minutes, objects at the equator would become weightless. Before that, you would simply feel lighter near the equator.

The bottom line

You are always moving at hundreds of kilometres per hour, around the Earth's axis, around the Sun and around the galaxy. You feel none of it because motion at a steady speed is physically indistinguishable from rest. Only changes in motion can be felt. It took Galileo's reasoning and Foucault's pendulum to reveal what our senses cannot: the ground beneath our feet is turning, smoothly and silently, all the time.

Curious about how gravity itself works? Read The Great Cosmic Trampoline: How Einstein Reimagined the Force of Gravity.

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Written by Imad El Bojaddaini, university professor of physics. Physics Voice explains the strangest ideas of physics in plain language.