It all comes down to your frame of reference, to put it another way, it's all relative!
Originally posted by DrZrD
reply to post by SageBeno
The orbital motion of our solar system my be 200,000 km/hr but it is still less than 1/4000 of the speed of light. And for velocities much less than the speed of light time dilation is proportional to
dt ~ 1+(1/2)*(v/c)^2
So the answer to your question is that very little time dilation is observed even at 200,000 km/hr.
Best regards,
Z
Originally posted by DrZrD
reply to post by Wifibrains
As it turns out the tangential velocity of our solar system around the center of the Milky Way was revised to be 914,000 km/hr a few years ago (much greater than 200,000 km/hr suggested by the OP). Moreover, the Milky Way Galaxy is moving through space at 2,300,000 km/hr for a combined velocity around 3,000,000 km/hr or 833 km/s. But even at the tremendous speed of 833 km/s it is still just a tiny fraction of 300,000 km/s for the speed of light.
Yes, the velocity from earths orbit around the sun must be added or subtracted from the absolute solar system velocity but at ~30 km/s it is insignificant.
Similarly, while earths gravity alone causes time slowing at the surface it is an insignificant effect. Earths rotation gives rise to relativistic rotational frame-dragging effects but these cause an even smaller degree of time dilation.
In summary, the combined time dilation effects from the Milky Way velocity through space, solar system velocity around our galactic center, earths velocity around our sun, earths gravitational space-time distortion, and earths rotational frame-dragging effects only cause an imperceptible amount of time slowing.
Best regards,
Z
A la Einstein
There was a young girl named Bright
Who would travel much faster than light
She started one day
In the relative way,
And came back the previous night.