Re: Two dumb questions

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.

It may be initially difficult to see things from a changing orbital
orientation passing through a fixed Earth orientation as the main
factor in seasonal differences but it certainly is worth the effort for
the alternative is just slightly better than a flat Earth i.e. a
hemispherical Earth like this description where axial tilt to the Sun
is attributed as a cause -

http://www.schoolsobservatory.org.uk/astro/textb/phys/seasonsanim.htm

There is an enormous difference between recognising Keplerian orbital
changes passing through fixed axial orientation and the inferior view
of axial tilt to the Sun.

.

Relevant Pages

  • Re: Two dumb questions
    ... >>change is due to the orbital orientation of the Earth changing through ... >>axial motion and orientation and treated orbital motion as an ... >>Listen carefully,the Sun does not bob up and down against the equator ... > combination of axial tilt and an elliptical orbit. ...
    (sci.astro)
  • Re: Geostationary or rotational dynamics
    ... There is a lovely view of the Earth as its axial orientation remains ... less the outlines of differential rotation and planetary shape/crustal ... sees the sun directly overhead at noon. ...
    (sci.geo.geology)
  • 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: Earth rotation
    ... >You are assuming that the Earth's equatorial orientation to the Sun ... >constant throughout its annual orbit.The Earth does not tilt towards ...
    (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 ... >> something else has to cause the illusion. ... >> Earth with an axial tilt property to the Sun for their agenda in trying ...
    (sci.astro)
Loading