On Nov 30, 2011, at 6:48 AM, Daniel R. Tobias wrote:
> On 23 Nov 2011 at 18:14, Rob Seaman wrote:
>
>> The Long Now 10,000-Year Clock is on the cover of Time magazine this week:
>>
>> http://blog.longnow.org/2011/11/22/time/
>
> The American version and/or the foreign ones? Time has been under
> some criticism lately for putting covers on weightier political
> topics in the overseas editions while using more "fluffy" subject
> matter domestically.
>
> http://on.fb.me/uxdox2
Yeah, I saw that the other day. Since this is a special issue, perhaps the
same cover is used wherever it's marketed.
> Speaking of time, what sort of time is the Long Now clock keeping,
> anyway? Solar, atomic, or something else entirely?
Solar. See our paper:
http://www.cacr.caltech.edu/futureofutc/preprints/10_AAS_11-665_Hillis.pdf
If UTC is redefined, clocks carried by visitors will drift away from the actual
time-of-day as provided by the Clock's orreries. The tick resolution is 5
minutes, emphasizing again the difference between precision and accuracy
(secular drift). The clock is also a calendar and it goes to great lengths to
avoid miscounting the days, even should the Sun be blocked from the sky for
many decades.
Rob
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