Re: 24 Hour Day


oriel36 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.

I don't see that there. I see the figure 23 hours, 56 minutes, and 4
seconds (4, 4.09 or 4.1) for the sidereal day (360 degrees of rotation
as measured against the background of stars, not against the sun).


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.

I really don't see your point. The sidereal day is simply defined as
the amount of time it takes the earth to rotate through 360 degrees as
measured against the background of stars. The 'justification' is a
simple measurement.


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

Are you saying that you are a geocentrist?



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.

Whatever. If your faith leads you to believe that the facts are
somehow wrong (e.g., a solar day <> a sidereal day because of a
calendrically driven clockwork system of Newton's solar system which is
a careless mutation of ancient systems. Or something.

One of these days you may realize that although the solar system may
not work out with neat and tidy numbers, the facts remain. The earth
continues to spin at the rate it does, which is different than the rate
it was, and different than the rate it will be in the future. 1 day is
not exactly 360 degrees as measured against the background of stars,
and no amount of mystical mathmatical hand-wringing is likely to change
that. I feel sorry that you have such a hard time accepting the
facts.

.

Relevant Pages

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