# Earth’s mean orbital speed

Earth's mean orbital speed is the speed at which Earth orbits the sun. It is about 29.78 kilometers per second, or about 107,000 kilometers per hour.

Is the Earth's orbital speed constant? The Earth's orbital speed is not constant. It varies depending on the Earth's position in its orbit around the sun. The Earth's orbital speed is fastest when the Earth is closest to the sun (perihelion) and slowest when the Earth is furthest from the sun (aphelion). How much does Earth's orbital speed change? Earth's orbital speed varies depending on its position in its orbit. It is fastest at perihelion, when it is closest to the sun, and slowest at aphelion, when it is farthest from the sun. On average, Earth's orbital speed is about 29.78 km/s.

##### Why does Earth's orbital speed change?

The speed of Earth's orbit around the sun varies for two reasons: the shape of Earth's orbit and the pull of gravity from other objects in the solar system.

Earth's orbit is an ellipse, meaning that it is not a perfect circle. This means that Earth is closer to the sun at some points in its orbit, and further away at others. When Earth is closer to the sun, it is pulled more strongly by the sun's gravity, and so it moves faster. When it is further away, the sun's gravity is weaker, and so it moves more slowly.

The other reason that Earth's orbit speed changes is because of the gravitational pull of the other planets in the solar system. The closer Earth gets to another planet, the more that planet's gravity affects Earth's orbit. This can speed up or slow down Earth's orbit, depending on which way Earth is moving around the sun relative to the other planet.

Why don't we feel the Earth rotating? We don't feel the Earth rotating because we're moving with it. The rotation of the Earth creates the force of gravity, which keeps us glued to the surface. If we were orbiting the Sun, we would feel the Sun's gravity pulling on us, but we would not feel the Sun itself rotating.

#### Why can't I feel the Earth spinning?

The vast majority of the time, you cannot feel the Earth spinning because you are moving with it. It's like being on a moving car - you don't feel the car moving because you are also moving with it. The only time you would feel the car moving is if it suddenly stopped or changed directions.

The same is true for the Earth. You usually don't feel it spinning because you are moving with it. The only time you would feel the Earth spinning is if it suddenly stopped or changed directions.

There are some other factors that can contribute to the feeling of the Earth spinning. For example, if you are on a moving platform like a Ferris wheel or a merry-go-round, you will feel the platform spinning because you are not moving with it. Or, if you are in a rotating room like the one in the movie Inception, you will feel the room spinning because you are not moving with it.

Ultimately, it comes down to relative motion. If you are moving with something, you will not feel it moving. It's only when you are not moving with something that you will feel it moving.