Nova Zhang
The Earth rotates faster than the speed of sound at the equator, travelling at 463.83 m/s compared to the speed of sound at 343 m/s. The Earth's rotation is smooth and constant, and while it is speeding up, it is doing so by milliseconds per century. This acceleration is so small that it is barely noticeable compared to the acceleration of gravity. The Earth rotates once every 24 hours, or 86,400 seconds, and moves around the sun at 67,000 mph.
| Characteristics | Values |
|---|---|
| Earth's speed of rotation | Up to 1,038 miles per hour or about 0.30 miles per second |
| Earth's speed of rotation in miles per second | About 0.30 miles per second |
| Earth's speed of rotation in kilometres per hour | 1,670 km/h |
| Earth's speed of rotation in kilometres per second | 463.831019 km/s |
| Speed of sound | 343 m/s |
| Earth's speed relative to the sun | 66,600 miles per hour or 19 miles per second |
| Earth's speed relative to the sun in kilometres per hour | 67,000 km/h |
| Earth's speed relative to the sun in kilometres per second | 18.611111 km/s |
| Solar system's speed in its orbit around the Milky Way Galaxy | 144 miles per second |
| Solar system's speed in its orbit around the Milky Way Galaxy in kilometres per second | 230 km/s |
| Earth's rotation period relative to the Sun | 24 hours |
| Earth's rotation period relative to distant stars | 23 hours, 56 minutes and 4 seconds |
| Length of a day in seconds | 86,400 seconds |
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What You'll Learn
Earth rotates faster than sound at the equator
The Earth rotates faster than the speed of sound at the equator. The Earth's circumference at the equator is 24,901 miles, or 40,075,000 meters. It rotates completely once a day or in 86,400 seconds. The speed of sound is 343 m/s and the Earth moves at the equator at 40,075,000 m / 86,400 s = 463.831019 m/s, which is faster than the speed of sound. When an object moves through the atmosphere at speeds higher than the speed of sound, it typically produces a sonic boom. However, the Earth's rotation does not create a sonic boom. This is because the Earth's rotation is smooth and gradual, and the atmosphere is not stationary. The Earth's rotation is influenced by various factors, including the motion of its molten core, oceans, and atmosphere, as well as the gravitational effects of celestial bodies such as the Moon.
The Earth's rotation is not constant and has been observed to vary over time. It rotates once in about 24 hours with respect to the Sun but once every 23 hours, 56 minutes, and 4 seconds with respect to distant stars. The length of a day is defined as 86,400 seconds, which was based on the Earth's rotation. However, due to changes in the Earth's rotation, the length of a day is now slightly different from this definition. To correct for this discrepancy, leap seconds are occasionally added to the final minute of December or June.
The Earth's rotation also affects our perception of time. As the Earth rotates faster during the summer months, the warm half of the year (from the March equinox to the September equinox) is about a week longer than the cold half. Additionally, the acceleration of gravity at the Earth's surface is reduced due to the rotation, particularly at the equator where things are moving the fastest. However, this reduction is relatively small compared to the force of gravity, so we don't notice it in our daily lives.
The Earth's rotation also has implications for space travel. For example, when sending rockets to other planets, we don't need to worry about significant speed differences, as Venus and Mars have similar orbital speeds to Earth. Furthermore, the Earth's rotation provides a stable platform for launching objects into space, as the rotation helps to counteract the force of gravity.
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Earth's rotation is accelerating
Earth's rotation speed is not constant and can be affected by various factors, including the tidal effects of the Moon and Sun, core-mantle coupling inside the Earth, and the distribution of mass on the planet. Earthquakes, volcanoes, tidal forces, subterranean geology, and other mechanisms can also cause the planet's rotation to speed up or slow down.
In 2020, scientists discovered that the Earth's rotation was faster than at any time in the previous 50 years. This trend continued into 2025, with July 9, July 22, and August 5 predicted to be the shortest days of the year, with the Earth's rotation completing faster than the standard 86,400 seconds or 24 hours that define a day.
While the exact cause of this acceleration is not yet fully understood, some scientists attribute it to factors such as the melting of glaciers and polar ice, rising sea levels, and the accumulation of water in northern hemisphere reservoirs. These factors redistribute the mass on the planet, affecting its rotation. Another theory suggests that the slowing of Earth's liquid core could be redistributing angular momentum, causing the mantle and crust to spin faster.
It is worth noting that the Earth's rotation speed also varies throughout the year, with the planet moving fastest along its orbit in January when it is closest to the Sun and slowest in July. This variation results in the warm half of the year, from the March equinox to the September equinox, being a week longer than the cold half.
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Earth's rotation is smooth
The Earth's spin pulls everything outward, but the force of gravity keeping everything stuck to the ground is much stronger. The atmosphere is also moving at the same speed as the Earth, so it feels stationary relative to us.
The Earth's rotation is so smooth that it is difficult to perceive. Stephanie Deppe, an astronomer and content strategist for the Vera C. Rubin Observatory in Chile, compares it to travelling in a car at a constant speed: if you close your eyes and tune out the road noise, you would feel stationary.
The rotation of the Earth has been measured at up to 1,038 miles per hour, or about 0.30 miles per second, depending on location. The Earth also orbits the Sun at around 66,600 miles per hour, or about 19 miles per second. The entire solar system is travelling at about 144 miles per second in its orbit around the Milky Way Galaxy.
The complex motion of the Earth's molten core, oceans, and atmosphere, as well as the effect of celestial bodies such as the Moon, contribute to the smooth and constant nature of the Earth's rotation.
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Earth's rotation is slowing
Earth's rotation is indeed slowing down, and this has been the case for some time. The interaction between ocean tides and Earth's continents is the biggest factor in this deceleration. The moon's gravitational pull on the Earth's oceans creates tides, and the friction between the tides and the turning Earth slows the planet's rotation. This process has gradually increased the length of each day over time.
Evidence of this slowing can be seen in the records of ancient eclipses. Astronomers can predict eclipses to a fraction of a second and can also determine when and where these events happened in the past. By studying eclipses dating back to the 8th century BCE, it has been found that Earth's rotation has slowed by about 6 hours in the past 2740 years. This works out as a lengthening of the 24-hour day by about 1.78 milliseconds over a century.
The rotation of the Earth is also affected by the movement of its liquid outer core. This motion gives rise to the Earth's magnetic field. While the Earth's rotation is slowing, the rotation of its liquid outer core is speeding up. This is due to the slow rebound of the crust, which was weighed down by massive ice sheets during the last ice age. As the crust springs upward at high latitudes, the planet is shrinking inward at lower latitudes, and this shift of mass is speeding up Earth's rotation.
The slowing of the Earth's rotation has had an impact on timekeeping. Each day is defined as 86,400 seconds long, and accurate timekeeping relies on the Earth spinning at a constant rate. However, the second was defined using rotation data accumulated over more than a century, resulting in a slightly incorrect interval. To correct for this error, a leap second has periodically been added to the final minute of December or June. Since 1972, 27 leap seconds have been added, and in November 2022, it was decided that the leap second would be retired by 2035.
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Earth's rotation relative to the sun
Earth rotates on its axis daily and revolves around the Sun annually. Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes and 4 seconds with respect to other distant stars. The Earth's rotation relative to the Sun (solar noon to solar noon) is its true solar day or apparent solar day. It depends on the Earth's orbital motion and is affected by changes in the eccentricity and inclination of the Earth's orbit. The true solar day tends to be longer near perihelion when the Sun moves along the ecliptic through a greater angle than usual, taking about 10 seconds longer to do so.
Earth's revolution around the Sun is elliptical and reaches its closest approach to the Sun, a perihelion of 147,090,000 km, on about January 4 each year. The Earth moves fastest along its orbit in January when it is nearest the Sun and slowest in July. The Earth's rotation is slowing slightly over time, meaning that a day was shorter in the past. The mean solar day in SI seconds since the introduction of the leap second in 1972 has been about 0 to 2 ms longer than 86,400 SI seconds.
Earth's rotation is distinct from its revolution around the Sun. The Earth rotates on its axis at up to 1,038 miles per hour, depending on location. Meanwhile, the Earth travels at 66,600 miles per hour along its orbit around the Sun. The Earth's rotation and revolution are essential for understanding our planet's natural motions and for developing a coordinate system for locating stars, planets, and spacecraft.
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Frequently asked questions
Yes, Earth rotates faster than the speed of sound at the equator, but it doesn't produce a sonic boom.
When an object moves through the atmosphere at speeds higher than the speed of sound, it will produce a sonic boom. However, the Earth's rotation is smooth, and the atmosphere is co-rotating with the Earth, so there is no sonic boom.
Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to other distant stars. The Earth rotates at up to 1,038 miles per hour, depending on location.
There are two major reasons. Firstly, Earth's rotation is smooth, similar to how one might feel stationary in a car moving at a constant speed. Secondly, the acceleration of gravity is much greater than the reduction in gravity due to the rotation of the Earth, so we don't notice it.
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