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

Click For Summary
SUMMARY

The discussion centers on the complexities of measuring Earth's velocity due to its multiple movements: rotation around itself, revolution around the Sun, and the Sun's orbit within the Milky Way galaxy. Participants emphasize that these velocities do not approach the speed of light (c) and highlight the concept of relative position and velocity as fundamental to modern physics. The notion that there is no absolute position or velocity is underscored, reinforcing the importance of using distant stars for accurate measurements.

PREREQUISITES
  • Understanding of Earth's rotation and revolution dynamics
  • Familiarity with the Milky Way's structure and motion
  • Basic principles of relative motion in physics
  • Knowledge of the speed of light (c) and its implications in physics
NEXT STEPS
  • Research the concept of relative velocity in astrophysics
  • Explore the implications of time dilation in special relativity
  • Study the structure and dynamics of the Milky Way galaxy
  • Investigate methods for measuring astronomical distances and velocities
USEFUL FOR

Astronomers, physicists, and students interested in the dynamics of celestial bodies and the principles of modern physics.

JPC
Messages
204
Reaction score
1
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 ?
 
Physics news on Phys.org
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.
 

Similar threads

Undergrad Why does laser beam hit the same target when fired?
  • · Replies 90 ·
4
Replies
90
Views
4K
Undergrad The Derivative Nature of Time and Its Relation to Earth's Rotation and Speed
  • · Replies 38 ·
2
Replies
38
Views
5K
Graduate Total velocity of resting object on earth from universal frame of refe
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Inquiry Regarding Concept in Time and Celestial Motion
  • · Replies 2 ·
Replies
2
Views
3K
Is My Calculation of Centripetal Acceleration and Tangential Velocity Correct?
  • · Replies 12 ·
Replies
12
Views
2K
High School Is Photon Rotation Key to Solar Wind and Earth's Orbit Stability?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Time Travel, Space Travel, Speed The Earths Movement, Speed Of Light
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Question of accuracy of galactic collision simulations
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Why Does the Sun Have an Orbital Period Like a Year?
  • · Replies 11 ·
Replies
11
Views
4K
Undergrad How do we measure the velocity of stars in a galaxy?
  • · Replies 4 ·
Replies
4
Views
2K