Re: 24 Hour Day

"Timberwoof" <timberwoof.spam@xxxxxxxxxxxxxxx> wrote in message
news:timberwoof.spam-CFAEF4.22170122052006@xxxxxxxxxxxxxxxxxxxxxxxxxxx
In article <1148331935.938903.241080@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"oriel36" <geraldkelleher@xxxxxxxxx> wrote:

Bill Hudson wrote:
oriel36 wrote:
The Earth rotates at a rate of 15 degrees per hour on its axis and
24
hours/360 degrees in total.

The pre-Copernican astronomers recognised that the return of the Sun
to
noon was never quite the same so they employed a system of addition
and
subtraction of minutes and seconds at noon to even out the
variations,this correction is known as the Equation of Time.

The Equation of Time allows one 24 hour day elapse seamlessly into
the
next 24 hour day and each and every person here will use those
principles based on civil days of Monday,Tuesday ect. This was known
as
the astronomical day and by decree and for convenience it was
shifted
to midnight in 1884 to mesh with the Ra/Dec system.

When heliocentricity emerged in the early 16th century and it was
discovered that the Earth had an axial rotation,the antecedent
Equation
of Time principles based on the equable 24 hour day was adapted to
the
principle of constant axial rotation at 15 degrees per hour.It is
one
of the lovliest ,the most pragmatic and most enjoyable extensions of
heliocentric reasoning.

The calendar system with its leap day adjustment every four years is
an
extension of the principles which created the 24 hour day The
primary
system, whether heliocentric or geocentric, did not require a
reference
to the stellar background however this system based on the Ra/Dec
system blurred with the seperate Equation of Time principles and
so
began the mess which has the Earth rotate to the Sun every 24 hours
and
to the stellar background in 23 hours 56 min 04 sec -


http://www.pfm.howard.edu/astronomy/Chaisson/AT401/IMAGES/AACHCIR0.JPG

So,the price of the calendrically driven celestial sphere system
which
Flamsteed created and Newton built on destroys the ability to
appreceate axial rotation in isolation for the 24 hour clock system
and
terrestial longitudes and orbital motion in isolation for
appreceation
of Copernican heliocentricity and its later refinements.

Now,I have given a day to you and leave without
prejudice.Empiricism
is certainly a way to approach natural phenomena but unsuitable for
intuitive disciplines of geology and astronomy.

What, are we supposed to be grateful for your wordy tripe?

A day is what it is: one rotation of the earth on it's axis. However
one 'appreciates' it, it's still a day. I'm not sure what your point
it, or if you even have one.


If you ask your friends they will propose that the rotation of the
Earth on its axis is not 24 hours through 360 degrees -

http://hypertextbook.com/facts/1999/JennyChen.shtml

That wordy explanation is the first real one of its type in
acknowledging how the heliocentric astronomers adapted the principles
of the equable 24 hour day to axial rotation at 15 degrees per hour.I
sincerely hope somebody else can pick up the common Equation of Time
link between the two as it is one of the greatest adaption in history.

The Equation of Time happens because the Earth's orbit is elliptical. If
the orbit were perfectly circular, then this effect would not happen,
but you'd still have the difference between sidereal and solar days.


This is only one of the two things that causes the Equation of Time. The
inclination of the Earth's axis of rotation also contributes. If the orbit
were perfectly circular, the EoT would look like a sine-wave plot; the
ellipticity is what distorts this shape.

I'm surprised that you accept elliptical orbits when you don't accept
heliocentrsm.


Oriel is very unclear about what he believes or disbelieves.

The 23 hours 56 min 04 sec justification is a long and complex
argument which eventually works into the creation of the AU and
ultimately into the calendrically driven clockwork system of Newton;s
solar system.He bases orbital motion on 365.25 days but uses a system
based on 3 years of 365 days and 1 year of 366 days.Don't worry about
it,the damage was done long before that.

Yea, it was done by Pope Gregory, who didn't have clocks accurate enough
to measure the difference between sidereal and solar days.


Actually, the Gregorian reform was accurate enough to keep the calendar year
and actual period of revolution in step to a precision of 1 day every 4,000
years or so. Pretty good if you ask me. The hard part is the Gregorian rule
for calculating the date of Easter.

This is genuinely the last posting and I really enjoyed moving rapidly
between one concept and another.

Translation: "I enjoyed writing whatever I felt like based on my
incomplete understanding of astronomy, unsullied by facts."



That's a good summary of all his posts!

I too had to learn all these systems
from scratch in order to see a better and mopre productive picture
emerge.Axial rotation,the 24 hour clock system.terrestial longitudes
happens to be human reasoning at its finest,it is only a matter of
somebody else bringing the same joy I know from recovering those
ancient systems from careless mutations.

I certainly acknowledge that it is only because of intuitive (faith)
faculties which love Christ and Christianity that I can apply the same
faculties to observed creation and what I inherit from the past.One
meshes with the other or is a facet of the other and it is personal and
not really open for discussion.

Yet another informal fallacy of logic: It is true because I demand it to
be true and no matter what facts you explain to me, I will not change my
mind. (In short, "lalalala, I can't hear you!")

--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com


--
Mike Dworetsky

(Remove "pants" spamblock to send e-mail)

.

Relevant Pages

  • Re: asteroid close approach, 2011 Nov 08
    ... of the Earth and the Universe it is no wonder you are sour and dour. ... the rush to the conclusion that daily rotation and stellar circumpolar ... The moon does not face the Earth. ... disgraceful in light of the acknowledgments afforded other astronomers ...
    (sci.astro.amateur)
  • Re: Astronomy for teenagers
    ... think that establishment astronomers have lost touch with reality. ... The change in orbital orientation as a location turns through 360 ... degrees with respect to the Sun as an orbital component is entirely ... rotation and that can be set aside as simply a guide to the behavior ...
    (sci.astro.amateur)
  • Re: Know your analemma from a hole in the ground
    ... rotation period of one sidereal day, ... affirming that there is no isolated external reference for daily ... does your specific arrangement of reasoning ... astronomers down. ...
    (sci.astro.amateur)
  • Re: The Seas
    ... the natural noon cycle and the human devised 24 hour cycle.I give you ... One can, and indeed must, begin from a uniform axial rotation of the ... Newton, here, admits that absolute space cannot be observed directly, ... great astronomers including the first great magnification astronomer - ...
    (sci.astro.amateur)
  • Re: 24 Hour Day
    ... The pre-Copernican astronomers recognised that the return of the Sun to ... principles based on civil days of Monday,Tuesday ect. ... When heliocentricity emerged in the early 16th century and it was ... principle of constant axial rotation at 15 degrees per hour.It is one ...
    (talk.origins)