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by kamagmar
5464 days ago
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> UTC (which is an arbitrary human invention) Hmm, i wouldn't call it totally arbitrary. UTC = TAI + LS, such that |UTC - UT1| < 1 second, where: * LS are leap seconds, * TAI is "physicist" time, based on the ticking of atomic clocks at mean sea level. The length of a second is constant. * UT1 is "astronomer" time, the rotation angle of the Earth with respect to the quasar reference frame. The length of a second is not constant. The Earth's rotation is slowing down, so UT1 is gradually drifting away from TAI. UTC is a pretty natural scheme to reconcile these two systems. |
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