Hi group,
The most absolute remarkable event in our _Universe_ is the Big Bang, and it
seems to be pretty well defined in time. It's rather sad that we're unable
to relate this event to our usual timescales (with a better precision than
several 10^9 years...!)
That would make a nice "absolute zero" for time, at least in our tiny
universe.
Jean-Louis
----- Original Message -----
From: "Brooke Clarke" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Thursday, October 28, 2010 4:47 PM
Subject: Re: [time-nuts] Absolute time (was Time of death-Again)
Hi Bill:
The Mayan calendar does not stop in 2012, only the short hand year
notation.
It's just like when our calendar stopped at 12/31/99, i.e the next year
was ZERO (aka Y2K)!
See:
http://en.wikipedia.org/wiki/Mayan_calender
http://en.wikipedia.org/wiki/2012_phenomenon
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bill Hawkins wrote:
If a far future observer was to make any sense of a date, quite
a lot would have to be known about the culture, including how to
read its markings.
It would be impractical to carve a map of the sky showing the
location of a stellar beacon on each tombstone, and then adding
some number of rotations of the Earth around the sun to it. How
would you describe leap seconds? Or seconds?
The use of BC and AD pervades our culture. What's needed is a
Rosetta Stone that has a lengthy description of the relation of
astronomical events to the year 0, after first describing the
time system (Y, M, D, H, M, S). Perhaps radioactive dating by
isotope ratios would be easier than describing years, using a
stellar event to pin down the base ratio to absolute time.
Any understanding of a culture includes an understanding of its
religions. Perhaps the Mayan calendar would be discovered first.
Too bad it stops in December 2012.
Bill Hawkins
-----Original Message-----
From: Raj
Sent: Thursday, October 28, 2010 9:17 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Time of death-Again
T=0 could be a recent supernova for a secular short measurement span
considering the life span of Earth.
OR
T=0 could also be a local solar system event that is easily determinable
on
Earth.
For someone measuring events on Earth a million years from now, give or
take
a ppm :-) or they may not care!
I think this is a sort of relativity question, isn't it? That is, you
just
have to pick some place/time, and reference everything else to that. So
which astronomical event do you want use as your reference (e.g. a T=0
epoch)and is it sufficiently well determined that you can figure it out
later? It's all well and good, for instance, to use noon on January 1st,
1900 or something as your time zero, but that's hardly a universally
available reference point.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
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