On Jan 9, 2012, at 6:36 AM, Ian Batten wrote:
> UTC has been redefined within living memory. One might suggest that good
> engineering would avoid assuming that a timescale which has been repeatedly
> redefined in both rate and phase won't be redefined again.
More straw. UTC has always meant Universal Time. Universal Time has always
meant mean solar time, in particular a close analogue to GMT.
For the true complexity of the situation, see:
http://ucolick.org/~sla/leapsecs/timescales.html
Rob Seaman
National Optical Astronomy Observatory
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