In message: c43e1c7d-f4ed-43bc-8b3e-3f7e62950...@noao.edu
Rob Seaman sea...@noao.edu writes:
: M. Warner Losh wrote:
:
: How is the Olson database fundamentally different than the
: historical data that a future historian would have based on the
: measurements of the delta
On Sun, 28 Dec 2008, Poul-Henning Kamp wrote:
In addition to the Olsen database, the book Calendrical Calculations
is probably required.
Calendrical Calculations isn't a reliable source for historians in the
way that the Olson database tries to be. CC is a mechanized description of
how
Tony Finch wrote:
Calendrical Calculations isn't a reliable source for historians in the
way that the Olson database tries to be. CC is a mechanized description of
how calendars are supposed to work,
Actually it doesn't even fully achieve that. The numerical algorithms
are correct, as far as I
Rob Seaman wrote:
Again, the issue is mean solar time, not local solar time.
This sentence doesn't make sense to me. You seem to have a different
definition of either mean or local from me. To be clear: the
(periodic) difference between apparent and mean solar time does not
affect my argument,
I wrote:
Historians looking backward want to relate events worldwide and
arrange them into coherent timelines.
Zefram replied:
Yes, they'll want the Olson database.
Precisely. For a scheme such as this to have any chance of working, a
requirement is that it be tightly coupled to a
In message: 20081227134333.gm2...@fysh.org
Zefram zef...@fysh.org writes:
: Historians looking backward
: want to relate events worldwide and arrange them into coherent
: timelines.
:
: Yes, they'll want the Olson database.
How is the
M. Warner Losh wrote:
How is the Olson database fundamentally different than the
historical data that a future historian would have based on the
measurements of the delta between what we call today TAI and UT1
times? It is just more data for them to swizzle into their
calculations?
On Dec 23, 2008, at 9:33 AM, Zefram wrote:
Suppose that people in the future overwhelmingly want local civil
time of day to continue to approximate local solar time of day.
Again, the issue is mean solar time, not local solar time. An
underlying timescale based on mean solar time is what
Daniel R. Tobias wrote:
And then your distant descendants will throw a huge fit about the
possibility of a leap hour being imposed, which would be much more
noticeably disruptive than leap seconds, and will indefinitely block
such a thing, until some day noon comes in the middle of the night.
On Tue, 23 Dec 2008, Zefram wrote:
Either of my scenarios still suffers from the problem that the TI-UT
difference accelerates. These timezone offset changes would be needed
at decreasing intervals. By the time timezones are jumping by an hour
every year, one might expect to see political
10 matches
Mail list logo
