[geocentrism] Re: Steven's points
- From: "Jack Lewis" <jack.lewis@xxxxxxxxxxxx>
- To: <geocentrism@xxxxxxxxxxxxx>
- Date: Fri, 26 Oct 2007 15:12:29 +0100
Dear Paul.
I can't bothered reading your rebuttal i don't have the time! The wobble or
precession is well documented in standard astronomy books. We are saying it is
wrong for the reasons we give which are the same reasons why helio's concoct
the wobble to account for no movement detected.
Jack
----- Original Message -----
From: Paul Deema
To: geocentrism@xxxxxxxxxxxxx
Sent: Friday, October 26, 2007 6:25 AM
Subject: [geocentrism] Re: Steven's points
Steven J, Jack L
I don't know what this 'wobble' is that you guys keep bringing up. If it's
the precession of the equinoxes then it's irrelevant. See here (first two
paragraphs are sufficient for this purpose).
http://en.wikipedia.org/wiki/Precession_of_the_equinoxes
The precession of Earth's axis of rotation with respect to inertial space
is also called the precession of the equinoxes. Like a wobbling top, the
direction of the Earth's axis is changing; while today, the North Pole points
roughly to Polaris, over time it will change. Because of this wobble, the
position of the earth in its orbit around the sun at the moment of the
equinoxes and solstices will also change.
The term precession typically refers only to the largest periodic motion.
Other changes of Earth's axis are nutation and polar motion; their magnitude is
very much smaller.
Currently, this annual motion is about 50.3 seconds of arc per year or 1
degree every 71.6 years. The process is slow, but cumulative. A complete
precession cycle covers a period of approximately 25,765 years, the so called
Platonic year, during which time the equinox regresses a full 360° through all
twelve constellations of the zodiac. Precessional movement is also the
determining factor in the length of an astrological age.
None of us will sit around for even one degree's worth of this. Could you be
talking about nutation or polar motion? I'd guess not but I'm open to
suggestion.
That leaves rotation about the celestial polar axis and rotation about the
ecliptic polar axis. The celestial polar axis is easy -- let's get that out of
the way first. We are agreed that there is relative radial motion of the sky
about the celestial polar axis or the Earth on its axis or some combination of
these two and that the time scale is once per sidereal day. Our disagreement is
about just what is rotating and what -- if anything -- is still.
The difficulty comes when rotation about the ecliptic polar axis is being
considered. This rotation is centred on the ecliptic poles which are on a line
through the plane of the ecliptic and orthogonal to it, the period being one
year. If you want to see (photograph) it, you'll first have to place the
ecliptic pole in the centre of the frame. Secondly, you'll have to observe it
over a period of something approaching months by recording one image each night
-- at midnight is convenient -- and building up a composite of all the images.
I managed to visualize this in my head -- it seems to me you should be able
to do the same, but if not, use a table top, salt and pepper shakers, whatever,
as props. Then, placing your salt shaker towards the edge of the table, imagine
it looking up toward a point on the ceiling removed to a very great distance.
Take a mental image, then take one pace around the table and repeat until you
arive back at your start point. If you now integrate all those images, you'll
see that the ceiling has -- relatively speaking -- rotated a full 360 degrees.
This time I'll use this colour to insert a comment or two below.
Paul D
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