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Lately I've been thinking (and I know it would take a lot of other variables like the orbit around the sun (circular motion etc.)), but as we can see, the graph of [Time dilation] vs [velocity as a fraction of the speed of light] is NOT linear, as shown here: http://www.thebigview.com/spacetime/timedilation.html" [Broken]

Because of this, wouldn't we be able to put a clock on an aeroplane (or something extremely fast), and measure time dilation between our time and the time on the plane, then rearrange the formula for v, and solve for how fast we, on earth, are travelling through space?

Of course this would have to be EXTREMELY accurate, and depending on what stage the Earth is rotating around the Sun and what direction the plane flies in is all important, but isn't there just that little possibility that this could be done?

Using this information couldn't we also find how long the Universe has been around, and where the centre of the Universe is (using another galaxy as a guide)?

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# Calculating the speed of the earth

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