Human-powered time travel is real

I have run 1,568,000 metres so far this year, in 556,440 seconds. But thanks to special relativistic time dilation (Lorentz factor is 0.999999999999996) this is, in fact, 556440.000000003926241 seconds of all you non-runners’ time.

So, yes, I have travelled 0.000000003926241 seconds into the future.



  1. Did you adjust for time spent running with / opposite to the Earth’s rotation? (Or did you run strictly north and south?)

    • I’m not sure running in different direction to the Earth’s rotation would matter – as all my fellow humans (except those on the ISS) would share that inertial frame, sort of? But you do raise the point about which direction I run – if I run North of here then I run into a place where the velocity of the Earth’s rotation is slower, but also where (in general) the ground is higher (much higher I am sure than the curvature of the Earth makes it lower. I need to make some more calculations!

      • Well, I am utterly confused by relativity (and, often, relatives), so I might be wrong about the east/west aspect. If the adjustment is based solely on time and not on velocity, it doesn’t matter. If velocity is a factor, then the issue is that you presumably measured distance from start to end point, rather than distance actually traveled. If running west, you did not actually run the full distance (the endpoint came to you), and the opposite if running east. Hence any velocity measurement would be a bit off.

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