Harald Tveit Alvestrand wrote:
> one of the amazing things I discovered some years ago when browsing the
> website of the Institute for Earth Rotation (!) is that leap seconds can't
> be predicted more than approximately 5 years in advance.
>
> it's a strange world.
Not so strange. The rule that always holds is the conservation of
angular momentum. The uncertainty is in the moment of inertia of
the earth. Movements in the tectonic plates cause slight variations,
enough to throw off predictions of leap seconds. spike
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