[LEAPSECS] Time on time
seaman at noao.edu
Wed Nov 30 12:18:41 EST 2011
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:
> 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.
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:
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.
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