[nudephil (OP)]

Dan sent us this:

The Earth rotates at 600 miles an hour.
The Earth orbits around the Sun at 70,000 miles an hour.
The Sun travels through the galaxy at 450,000 miles an hour.
I assume the first 2 will cancel as day/seasons come and go.
But, 450,000 miles an hour - if I live to be say 80,000 years old, due to relativity, how much time have I gained? Relative to someone not moving, millions of light years away from everything.

Any response?

[Halc]

The Earth rotates at 600 miles an hour.

The equator moves at more than 1000 mph

The Sun travels through the galaxy at 450,000 miles an hour.

That actually currently cancels some of the galaxy's motion relative to the mean of all the stuff around us.

But, 450,000 miles an hour - if I live to be say 80,000 years old, due to relativity, how much time have I gained? Relative to someone not moving, millions of light years away from everything.

That speed (never mind the gravity well) has a dilation factor of 1.000000225
So if you live 80K years, it makes you about six and a half days younger.  Not sure if you consider that time gained or time lost.

[yor_on]

Locally defined you have gained nothing. Your lifespan relative your wristwatch is always the same, generally speaking. And you don't 'live' others 'mass' or 'speeds'.

It all becomes relative how you define it if you're looking for a 'global' definition. You can to all purposes define yourself as not 'moving' at all, in which case any 'speed' you define for another observable becomes its own, you 'standing still', it makes for a very weird universe but I still consider it allowable from relativity.  Or you can do the opposite and define all speed to yourself in which case you also will define a time dilation, or share it with the other observable giving you both some 'time' :)
=

Well, when it comes to mass you do share a relation that is easier definable when it comes to time dilation's, than it is with speeds. But it doesn't change the fact that there will be no difference to your own experience aging. As a example the world around you consist of pieces of mass, some 'at rest' with you, others moving, as that car. All of them acts gravitationally on each other and gets acted upon. If you want you can define it such as all of them have a different 'clock rate' relative your body's mass. does that make you age 'slower' or  'faster' depending on where you are, or at what speed you are relative one piece or another? Expressed otherwise, do you expect yourself to have more time to think if you're at rest with a larger mass?