On 01/08/2012 08:14 PM, Warp wrote:
> That question is actually surprisingly complicated and ambiguous.

A sidereal year? A tropical year? A calendar year? Some other type?

They are all /approximately/ the same length, but not exactly...

At to this that both the Earth's orbit velocity and rotational velocity 
aren't actually constant, and things get interesting.

But don't fret. They're all nearly the same length in proper time, but 
at relativistic velocities relative to the Solar System, even the 
question becomes somewhat meaningless. ;-)

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