[LEAPSECS] Time on time

Rob Seaman 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:


>> 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:


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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