On Jan 11, 2012, at 4:59 AM, Tom Van Baak wrote: > > When was the _rate_ of UTC such that 86400s == 1 mean solar day? > > > > ian > Ian, > > Although on average LOD is more than 86400 s by a few milliseconds, in the > past fifty years about 3% of the days have been shorter than 86400 s. In the > past decade alone the figure is 14% (the earth has sped up quite a bit the > past decade). You can imagine then that some days must be rather close to no > error. > > Five days were within 1 microsecond and the record goes to November 29, 2004 > which was just 200 nanoseconds shy of a perfect 86400 second day.
How much better would be if we'd adapted a mean solar second of 1900 instead of 1820 which we wound up with? Warner
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