# Combined velcoities of earth's rotation and revolution + sun + galaxy

• JPC
In summary, the conversation discusses the movements of the Earth, sun, and galaxy, and questions how to accurately measure position and velocity in relation to these movements. The conclusion is that there is no true position or velocity, only relative measurements, which is a key concept in modern physics.
JPC
hey

since the Earth turns around itself , turns around sun, sun turns around galaxy, galaxy is in movement (or maybe orbiting something bigger, who really knows ?)

Well with all these movements, our velocity must be close to c ?

thus , what is galaxy turns around ..., which turns around..., which turns around ..., ect

how can we really localise ourselves with dots that don't move (to measure true position + velocity), apart from just using starts really really far away ?

There is no true position, neither is there true velocity.
There is only relative position and relative velocity.
That insight ist at the heart of modern physics.

This exact question is open near the top of this forum...

The answer, in addition to what was already said, is no, adding up all those velocities doesn't get you anywhere close to C, so it isn't even relevant to think about time dilation due to speed between most objects in the galaxy.

## 1. What is the combined velocity of Earth's rotation and revolution?

The combined velocity of Earth's rotation and revolution is approximately 1670 kilometers per hour, or 1037 miles per hour. This means that Earth is moving at a speed of about 460 meters per second, or 1670 kilometers per hour, as it rotates on its axis and orbits around the sun.

## 2. How fast is the sun moving through the galaxy?

The sun is moving through the Milky Way galaxy at an average speed of 828,000 kilometers per hour, or 514,500 miles per hour. This movement is a result of the gravity of the galaxy as well as the expansion of the universe.

## 3. Is the velocity of Earth's rotation and revolution constant?

No, the velocity of Earth's rotation and revolution is not constant. The speed of Earth's rotation varies depending on location and latitude, while the speed of its revolution around the sun is affected by the elliptical shape of its orbit.

## 4. How does the combined velocities affect time on Earth?

The combined velocities of Earth's rotation and revolution, along with the sun's movement through the galaxy, do not significantly affect time on Earth. However, the gravitational pull of the sun and other celestial bodies can cause small variations in the length of a day or year.

## 5. Can the combined velocities of Earth's rotation and revolution change over time?

Yes, the combined velocities of Earth's rotation and revolution can change over time due to various factors such as changes in the Earth's orbit and the gravitational pull of other celestial bodies. These changes can be very small and are usually not noticeable on a day-to-day basis.

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