Re: Two dumb questions



OG wrote:
> <geraldkelleher@xxxxxxxxxxx> wrote in message
> news:1121023902.442903.56100@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > To Friar
> >
> > To really appreciate what is happening beyond the illusion of sunset
> > and sunrise and equatorial orientation to the Sun it is best to order
> > things according to their correct properties.
> >
> > First things first - the earth's axial orientation is more or less
> > constant over the course of a year,you can check this by the North star
> > Polaris -
> >
> > http://homepage.mac.com/tarashnat/astrophoto/images/0001-08a.jpeg
> >
> > As the Earth's polar axis is fixed to Polaris ,it follows that the
> > Earth's Equator at 90 degrees to the axis will also remain fixed -
> >
> > http://www.qrg.northwestern.edu/projects/vss/docs/media/Navigation/equator-45s.gif
> >
> > What causes the seasons is not axial tilt to the Sun or orbital plane
> > but the change orientation of the Earth in its orbit around the Sun,it
> > stands to reason as the Earth as a whole does not tilt (see Polaris) so
> > something else has to cause the illusion.
> >
> > It was a decision by 17th/18th century cataloguers to furnish the
> > Earth with an axial tilt property to the Sun for their agenda in trying
> > to solve the Longitude problem and it will drive you insane if you are
> > not careful enough to escape the bluffing and blustering.
>
> Gerald has not been driven insane, but he has lost the plot on this matter.
> It is reasonable to ask what he means by this, but since he doesn't really
> understand that the 'change orientation of the Earth' is caused by 'axial
> tilt to the orbital plane', he has real problems in explaining himself.
>
> If contradicted he tends to end up with abuse.

Not at all,the change in orbital orientation of the Earth can be
graphically represented against a fixed axial orientation.

http://www.mhhe.com/physsci/astronomy/fix/student/images/04f15.jpg

Unfortunately cataloguers are inclined NOT to see tha change in orbital
orientation because Flamsteed combined axial and orbital motion working
off the Earth's axis is order to justify axial rotation at 23 hours 56
min 04 sec.See -

http://astrosun2.astro.cornell.edu/academics/courses/astro201/images/sidereal_day.gif

It is initially tricky but because polar axial orientation is more or
less constant and there is no much more you can say about it -

http://homepage.mac.com/tarashnat/astrophoto/images/0001-08a.jpeg

In falls to the change in orbital orientation at roughly 90 degrees to
where hemispherical cataloguers have it (Equatorial axial tilt) that
causes seasonal changes.I have said many times that 17th century
cataloguers were only interested in solving the Longitude problem
through tying the celestial sphere to terrestial longitudes but to do
that they have to perform some awful surgery on some exquisite
astronomical principles.

More importantly,at dawn and dusk on the Equinox the terrestial
longitudes representing the Earth's axial rotation and axis run
parallel with orbital orientation and for a few moments we escape the
illusion generated by axial rotation and see the orbital motion of the
Earth on its own.

.

Relevant Pages

  • Re: Two dumb questions
    ... > and sunrise and equatorial orientation to the Sun it is best to order ... > but the change orientation of the Earth in its orbit around the Sun,it ... > Earth with an axial tilt property to the Sun for their agenda in trying ...
    (sci.astro)
  • Re: Two dumb questions
    ... First things first - the earth's axial orientation is more or less ... What causes the seasons is not axial tilt to the Sun or orbital plane ... but the change orientation of the Earth in its orbit around the Sun,it ... Earth with an axial tilt property to the Sun for their agenda in trying ...
    (sci.astro)
  • Re: Two dumb questions
    ... > and sunrise and equatorial orientation to the Sun it is best to order ... > but the change orientation of the Earth in its orbit around the Sun,it ... > Earth with an axial tilt property to the Sun for their agenda in trying ...
    (sci.astro)
  • Re: Goto Nixed for Club by AAVSO Oldtimer
    ... orbital orientation change of the Earth to the Sun,due to the Earth's ... but it's also exactly what the conventional astronomers say. ... The Earth does not change the way its axis points. ... components but you creatures insist in referencing the Earth's motions ...
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  • Re: precession, tops, and the Earth
    ... counter-clockwise, and its axis precessing clockwise, as seen from above ... Earth does (and as the diagram shows the top also doing). ... The reasoning implies that axial/equatorial orientation pivots off ...
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