[geocentrism] Re: Two spin axes of Earth?
- From: Regner Trampedach <art@xxxxxxxxxx>
- To: geocentrism@xxxxxxxxxxxxx
- Date: Mon, 12 Nov 2007 00:38:07 +1100
The Earth's orbit is an ellipse with a small eccentricity (deviation from
circle) of 0.0167 (circle is 0.0).
First of all; an ellipse has two focal points ("centres")
and a circle of course only has one. An ellipse can be drawn with two pins
stuck into the paper, and a loop of thread around both, pulling the loop
out to a triangle with your pen. Draw around the two pins with the loop
taught and the result will be an ellipse. For close pins and a long loop
you will get small eccentricity and close to an ellipse (small eccentricity).
Second; the Sun-Earth centre-of-mass (about 450 km from the Sun's centre
only 0.06% of the Sun's radius) will be at one focal point (one of the pins
in your drawing) of the ellipse described by the Earth's orbit. The two
focal points are symmetric about the actual centre of the ellipse. The main
elliptical effect of a small eccentricity will be the offset by the focal
point. And I can assure you that the Earth orbit I plotted is not a circle,
although it is close.
The Sun-Earth distance (the instantaneous radius of the Earth orbit) can
be measured directly by the parallax method from opposite sides of the Earth.
Variation in the Sun-Earth distance can also be measured by observing the
change in apparent size of the Solar disk. The diameter of the orbit, on the
other hand, cannot be measured, and also makes little sense when dealing with
ellipses.
Kind Regards,
Regner Trampedach
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Quoting Jack Lewis <jack.lewis@xxxxxxxxxxxx>:
> Dear Regner,
> Thanks for the response. Could you just clarify a couple of points for me?
> Why is the Earth's orbit around the sun slightly offset from the 2AU
> diameter and how was this difference measured? The two diameters appear to
> be the same so why is it referred to as a 'mean' diameter.
>
> I shall delete the parts of original e-mails that are not needed for the
> reply - it saves 'Inbox' space for those with small 'Inboxes'.
>
> Jack
>
>
>
> ----- Original Message -----
> From: "Regner Trampedach" <art@xxxxxxxxxx>
> To: <geocentrism@xxxxxxxxxxxxx>
> Sent: Sunday, November 11, 2007 11:33 AM
> Subject: [geocentrism] Two spin axes of Earth?
>
>
> > As a warm up, I'll try to throw a little light on what happens to our
> > view of the sky during a year, as seen from the heliocentric viewpoint.
> > Several people have raised a point that Earth should be spinning around
> > two sets of poles if the heliocentric view is correct and the observations
> > therefore blatantly contradicts this view. This is not correct.
> > I have included two figures illustrating my points and there is a little
> > glossary at the bottom. Sorry for the long post, but I hope you will find
> > it precise, concise and to the point, never-the-less.
>
>
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