Re: NO positive leap second will be introduced at the end of December 2006

Explain to these guys where you get the equable 24 hour days to
determine the annual orbit and explain it astronomically.

Thankfully the great astronomical systems ,including the recent
heliocentric adaption to axial rotation at 15 degrees per hour,was
built by a different type of person than you and your colleagues.

The two step scheme which creates the equable 24 hour day from the
return of the Sun to noon and the astronomical correction applied to
that event and its transfer to the principle of independent axial
rotation should be one of the most loved astronomical principles of
all.

There is no external reference for axial rotation at 15 degrees per
hour and 24 hours/360 degrees in total,that is the exquisite jewel in
the two step process which gives us the insight in how the standard
pace of a clock keeps in sync with axial rotation.





Dr John Stockton wrote:
JRS: In article <SpidndtFxprwhVzZnZ2dnUVZ_vadnZ2d@xxxxxxx>, dated Fri,
21 Jul 2006 14:09:39 remote, seen in news:sci.astro.amateur, Richard
F.L.R.Snashall <rflrs@xxxxxxxxxxxxx> posted :
Dr John Stockton wrote:

But, of course, neither Pope nor King introduced quadrennial Leap Years;
they introduced the omission of a specified 3% of what would have been
Leap Years under the rules then extant. It was G Julius Caesar,
Imperator and future assassinee, who introduced (in principle)
quadrennial Leap Years; and one of his successors a generation or so
later who got the implementation corrected.

If we really think we know the length of a year, shouldn't the rule
be "365 days except every fourth, except every twenty-fifth, except
every fourth, except every eighth, except every hundred forty fourth"?
All I've ever were the first three exceptions.


We know the length of a year, suitably defined, to something like five
or six decimal places of mean solar days.

The first part of your rule gives the Julian Calendar, and the first
three parts give the Gregorian; those were good estimates for their
time.

The Mean Solar Year is at present 365.24219 days, AIUI, which is 0.00031
days less than the Gregorian estimate, giving a discrepancy of one day
per 3225 years, for which either 3200 or 4000 years could be chosen as a
practical approximation. No such choice has been made by any competent
administrating authority (although (a) the Greek Orthodox have rendered
it inappropriate by modifying Gregory's third rule, (b) about a century
ago Encyclopaedia Britannica thought otherwise).

One can see that with Caesar's rule lengthening the year, Gregory's
additional rules first shortening and lengthening the year, dropping a
day every 3200 years would improve the approximation to the present
year-length.

The uncertainty in the present length of the year renders any attempt to
determine a further (to 3200 years) correction interval ludicrous; even
the sign of the next correction (if 3200 were chosen) appears in doubt.

But, of course, it is not the present length of the year which matters;
the rate of leap days needed in an interval depends on the average
length of the year (in solar days) in that interval. Variation of the
Earth's orbital period will be unimportant on this time scale. But
variation of the Earth's rate of rotation will be important; and that
rate is affected both by tidal dissipation and by climate change
(altering out moment of inertia).

There is no practical need to change the Gregorian Rule at the present
time; but, for the present year-length it would be better to retain the
Julian Rule, drop the additional Gregorian ones, and instead omit
February 29th in each year divisible by 128, with first effect in 2048.

Also, by omitting Leap Years until that date, ISTM that the Solstices
and Equinoxes might be brought, on average, to the divisions of the
years into Quarters.

In either case, a change in the rules for the Date of Easter Sunday
would be warranted.

See via sig below.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms
PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.

.

Relevant Pages

  • Re: NO positive leap second will be introduced at the end of December 2006
    ... I don't think that oriel36 understands that Leap Years deal with the ... A location on Earth does not rotate to face the Sun every 24 ... system with a leap day correction every 4th year,the equable 24 hour ... You,on the other hand, determine that axial rotation can be discerned ...
    (sci.astro.amateur)
  • Re: NO positive leap second will be introduced at the end of December 2006
    ... Leap Years under the rules then extant. ... The Mean Solar Year is at present 365.24219 days, AIUI, which is 0.00031 ... days less than the Gregorian estimate, giving a discrepancy of one day ... the sign of the next correction appears in doubt. ...
    (sci.astro.amateur)
  • Re: Starmapping software
    ... when the actual principles which correlate clocks with axial rotation ... factor, a correction. ... devised by astronomers based on the daily cycle as the Sun returns to ... and intuitive intelligence and I am prepared to leave it at that. ...
    (sci.astro.amateur)
  • Re: Astronomers Vs Harrison (clock maker) ref Longitude problem
    ... Then you freaks combine axial rotation with orbital motion and come up ... You and everyone else here will use the ancient principles which fix ... the equable hour,min and sec from the noon correction and the ... Hug your telescopes and talk of the Sun and planets rising and setting ...
    (uk.sci.astronomy)
  • Re: alt.horology participants, you have been HAD!!!
    ... The working principles required for avenues such as geology,climatology ... axial and orbital motion and the unrealistic notions springing from the ... into heliocentric independent axial rotation. ... Do you not know that the Equation of Time correction act like daily ...
    (alt.horology)