Cecil Moore wrote:
wrote:
And since the frame of reference is a defined thing and not a physical
reality, it doesn't matter if the Earth continues to exist or not either.
You seem to have a lot of difficulty with this concept.

A frame of reference based on 1/86400 of one rotation
of the Earth which is only 1/3 as old as the universe?
A frame of reference based on the oscillation frequency
of Cesium when Cesium didn't even exist before the first
super nova? I'm not having difficult with the concept.
I'm just wondering why anyone would accept such a
flawed concept. The 17th Century Catholic Church's frame
of reference was earth-centric. So is our time frame of
reference. Both are equally valid.

Babbling nonsense.

http://www.bipm.fr/utils/common/pdf/...chure_8_en.pdf

"Unit of time (second)

The unit of time, the second, was at one time considered to be the
fraction 1/86 400 of the mean solar day. The exact definition of
?mean solar day? was left to the astronomers. However measurements
showed that irregularities in the rotation of the Earth made this an
unsatisfactory definition. In order to define the unit of time more
precisely, the 11th CGPM (1960, Resolution 9; CR, 86) adopted a
definition given by the International Astronomical Union based on
the tropical year 1900. Experimental work, however, had already shown
that an atomic standard of time, based on a transition between two
energy levels of an atom or a molecule, could be realized and
reproduced much more accurately. Considering that a very precise
definition of the unit of time is indispensable for science and
technology, the 13th CGPM (1967/68, Resolution 1; CR, 103 and
Metrologia, 1968, 4, 43) replaced the definition of the second by
the following:

The second is the duration of 9 192 631 770 periods of the radiation
corresponding to the transition between the two hyperfine levels of the
ground state of the caesium 133 atom.

It follows that the hyperfine splitting in the ground state of the
caesium 133 atom is exactly 9 192 631 770 hertz, ?(hfs Cs) = 9192631770 Hz.

At its 1997 meeting the CIPM affirmed that:

This definition refers to a caesium atom at rest at a temperature of 0 K.
This note was intended to make it clear that the definition of the SI
second is based on a caesium atom unperturbed by black body radiation,
that is, in an environment whose thermodynamic temperature is 0 K.
The frequencies of all primary frequency standards should therefore be
corrected for the shift due to ambient radiation, as stated at the meeting
of the Consultative Committee for Time and Frequency in 1999"

Go argue with the standards people.

--
Jim Pennino

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