Our Planets & Solar System

Learn about the planets

How fast does the Earth spin?

It’s strange to think that Earth the planet we are living on is continually spinning 24 hours a day, 7 days a week and 365 days a year as it orbits the Sun. One full orbit of the Sun takes a full year and and is the basis for the formation of our calendar. It takes 24 hours for the Earth to completely spin around once and is the basis of a daily 24 hour clock. But how fast does the earth spin on its axis and how can we calculate the speed?

How to calculate how fast the Earth is spinning

The Earth circumference at the equator is roughly 40,075 kilometres. To work out how fast does the earth spin We divide the circumference of the Earth by the length of a day.

Earths circumference divided by the hours in a day = how fast the Earth is spinning

40,075 km / 24 hrs = 1,669.7917 km/h

Or rounded up 1,670 kilometres an hour or 1,038 miles per hour. Wow that is fast 🙂

1,038 miles per hour (mph)

1,670 kilometres per hour (kmh)

Even though the Earth is spinning at over 1,000 mph every second of the day, we don’t feel it. Similar to if we were inside a car travelling along a route.

Interesting scientific fact

While we are on the subject it is also worth mentioning that scientists have calculated one full rotation on the earths axis in relation to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.

More space mysteries & answers to your questions about the planets!

  • Why is Venus the hottest planet?
    You might think that the planet closest to the Sun would be the hottest, right? But that’s not the case. The hottest planet in our solar system is actually Venus, which is second from the Sun. Why, you ask? Well, it’s all because of its super thick atmosphere and something called the greenhouse effect. Acid … continue reading.
  • Why is Venus Earth’s sister planet?
    Venus is often referred to as Earth’s “sister planet” due to their similar size, composition, and proximity to the Sun. Both planets have nearly the same diameter and mass, and they’re made up of similar rocky materials. Venus and Earth also have substantial atmospheres, though Venus’ is far denser and hotter. However, the similarities largely … continue reading.
  • Why does planet Venus spin backwards?
    If you are wondering why our neighboring planet Venus spins backwards this quick guide will provide more insight. While other planets follow the cosmic dance of rotating in the same direction as they orbit the Sun, Venus dares to be different. It’s a planetary rebel, rotating in the opposite direction, and scientists are still unraveling … continue reading.
Learn about the planets