Time dilation

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jules
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Time dilation

Postby jules » Thu Feb 15, 2018 1:32 pm

Image

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hifinutt
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Re: Time dilation

Postby hifinutt » Thu Feb 15, 2018 4:53 pm

now jules , you might have to explain this one very slowly to me !!

what does it all mean ?
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Re: Time dilation

Postby mickbald » Thu Feb 15, 2018 10:28 pm

It's an Einstein General Relativity thingy.

At the end of the day it is unlikely to effect speaker placement over the time you keep a pair :D

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Re: Time dilation

Postby angelface » Fri Feb 16, 2018 9:44 am

hifinutt wrote:now jules , you might have to explain this one very slowly to me !!

what does it all mean ?


We think time is a constant but it is in fact the speed of light is a constant. What this means is that time slows the faster you are moving. A very minor difference unless you are travelling near the speed of light. This means that the notion of star date in Star Trek is complete nonsense if you travel at warp factor 8!
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Re: Time dilation

Postby jules » Fri Feb 16, 2018 11:13 am

Yep it's a graph that encapsulates both special and general relativity time dilation for the case of orbiting satellites....

In basic terms the passage of time is affected by gravity and relative speed so....

An object in a weaker gravity environment (e.g. outer space) will measure their own clock to speed up, compared to another that is under a weaker gravitational field (e.g. earth's surface). [General relativity.]

An object travelling fast will measure his own clock to slow down, compared to another that is relatively stationary. [Special relativity.]

What made the graph so interesting is that orbiting satellites are subjected to both time speeding and slowing by varying amounts due to their orbiting altitude - the well known fact that lower orbits require a faster speed to stay in orbit (that's why the ISS, in a low orbit circles the earth 15.5 times a day and much higher geostationary satellite, e.g. SKY, circles the earth once a day).

So the green line shows how much time speeds up as you move away from the centre of the earth - compared to someone of the surface of the earth...

The red line show how much time slows for the orbiting object due to its speed - compared to someone of the surface of the earth.

And the blue line shows the net combination of the green and red lines....
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