Re: NO positive leap second will be introduced at the end of December 2006
- From: "oriel36" <geraldkelleher@xxxxxxxxx>
- Date: 21 Jul 2006 03:06:36 -0700
Dr John Stockton wrote:
JRS: In article <UoqdnQP8SM4i8SPZnZ2dnUVZ_qydnZ2d@xxxxxxx>, dated Wed,
19 Jul 2006 13:32:40 remote, seen in news:sci.astro.amateur, Richard
F.L.R.Snashall <rflrs@xxxxxxxxxxxxx> posted :
oriel36 wrote:
Tell people why a 86 400 leap second correction is needed every 4 years
and what happens to that quarter day each year in respect to the annual
orbit of the Earth.
Because it's easier than adding a leap minute
every day except every 72nd.
I don't think that oriel36 understands that Leap Years deal with the
(substantially constant) non-integer part of the ratio between the
Earth's orbital and rotational periods, while Leap Seconds deal with the
(slightly-varying) discrepancy between 86400 seconds SI and the period
of the Earth's rotation with respect to the Sun's position.
My turn.
A location on Earth does not rotate to face the Sun (noon) every 24
hours/86 400 seconds hence the Equation of Time correction.This
pre-Copernican correction based on the return of the Sun to noon
effectively equalises out the natural variations and facilitates the
seamless transition from one 24 hour day to the next 24 hour day.
The pre-Copernican astronomers who constructed the system of equable 24
hour days which was extended on to the complimentary calendrical system
based on the annual orbit calculated by using those equable 24 hour
days as 365.25 days,the point being that to construct a calendrical
system with a leap day correction every 4th year,the equable 24 hour
day had to be constructed first.The intutitive and intellectual
intelligence required to discern this crucial point affects all ahead
of it and especially for the working principles for axial rotation in
isolation for the clock system and orbital motion in isolation for
Copernican heliocentricity.
You,on the other hand, determine that axial rotation can be discerned
as an independent motion through the return of a star to a terrestial
meridian in 23 hours 56 min 04 sec and any variation in the return
constitutes a variation in the Earth's axial rotational speed.This is
dangerously incorrect and perhaps highlights the obstacles felt in
other areas such as global climate studies where an accurate
representation of the Earth's axial and orbital motions and
orientations are required.
So,far from telling me what I do or do not understand,I lay down
exactly why correcting this horrible situation is required,not just the
obstacles placed in terms of global climate studies with the sheer
counter-productive nature of the erroneous sideral view of which leap
corrections ahighlight the issue.
Most people know the Earth rotates through 360 degrees in 24 hours
without knowing the principles behind the Equation of Time correction
which keeps it that way however those who maintain the value of 23
hours 56 min and justify it astronomically veer towards that ignorance
which is destructive and counter-productive to humanity.
It is not a matter of being correct,it is a matter of adopting the
correct working principles which ceased after the 17th century
empirical mutations give rise to theortical junk clogging the great
astronomical insights of Copernicus and Kepler.It is a fight for
geometry in motion as much as anything else and with contemporary
technological tools such as time lapse footage,it becomes easier to
surmount the linguistic tinsel concealing humanity's great astronomical
achievements.
I would love to show you how the pre-Copernican equable 24 day
principles tranfer to its heliocentric adaption at a rate of 15 degrees
per hour but the explanation is just appearing for the first time and
capable people involved in graphic design are required to build this
enormous and exciting structure just as our ancestors did ,stretching
from remote antiquity.
Here is the best you can do -
http://www.pfm.howard.edu/astronomy/Chaisson/AT401/IMAGES/AACHCIR0.JPG
Do you wish a child to tell you that the Earth covers a greater
orbital distance along its obital circumference the further it is from
the Sun under such a scheme ?.That is the price of your 23 hours 56 min
04 sec justification.
There is (it is said) a historical justification for the use of the word
"Leap" in respect of Leap Years; it is probably a pity that the same
word was used for an entirely different adjustment involving seconds.
A Leap Minute every 73 days is one part in 1440*73 ~ 1 in 1E5
Leap Years are 0.2425 parts in 365.2425 ~ 1 in 1500
A Leap Second every year would be one part in about 31E6
So I don't see why you want a Leap Minute every 73 days.
--
© 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.
.
- References:
- NO positive leap second will be introduced at the end of December 2006
- From: Sam Wormley
- Re: NO positive leap second will be introduced at the end of December 2006
- From: oriel36
- Re: NO positive leap second will be introduced at the end of December 2006
- From: Richard F.L.R.Snashall
- Re: NO positive leap second will be introduced at the end of December 2006
- From: Dr John Stockton
- NO positive leap second will be introduced at the end of December 2006
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