Re: Spam Free Alternatives to the Usenet Astronomy Groups

On Apr 11, 9:41 am, bluemoon <bluem...@xxxxxxxx> wrote:
oriel36 wrote:
On Apr 10, 12:19 am, bluemoon <bluem...@xxxxxxxx> wrote:

If the rotational axis of the earth were fixed at a right angle
(perpendicular) to it's orbital plane around the sun, instead of towards
Polaris, would you agree there would be no seasons, the length of day
and night would always be the same for any latitude and the sun would
always rise directly east and set directly west?

That is almost repeating,word for word,the original statement of
Coperniucs almost 600 years ago except that Copernicus used
heliocentric terms based on axial/equatorial inclination and no
geocentric sunrise/sunet descriptions -

To this circle, which goes through the middle of the signs, and to its
plane, the equator and the earth's axis must be understood to have a
variable inclination. For if they stayed at a constant angle, and were
affected exclusively by the motion of the centre, no inequality of
days and nights would be observed. On the contrary,it day or the day
of equal daylight and darkness, or summer or winter, or whatever the
character of the  season, it would remain identical and
unchanged." Copernicus

The hypothesis of no tilt/no seasons was made at a time when there
were no telescopes therefore no way to make planetary comparisons
whereas today we can look at the new role for 'tilt' as determining
seasonal characteristics but not causing the seasons as Copernicus had
it and you may believe.

The contemporary view,using planetary comparisons between Earth and
Uranus modifies the role of 'tilt' to influencing conditions between
Equatorial or polar  therefore your description of 'no tilt' is
comparable to conditions that exist at all planetary equators
regardless of the degree of rotational orientation.Above 45 degrees
and a planet will experience Equatorial type conditions such as Earth
( 23 1/2 Deg)  while below 45 degrees and a planet experiences polar
conditions such as Uranus.This uses 'tilt' effectively and then allows
seasonal changes to occur from the orbital dynamic or the specific way
a  planet orbits the Sun -

http://astro.berkeley.edu/~imke/Infrared/UranusAo/ur_time_2001_2005.jpg

There is no reason whatsoever that organisations like NOAA cannot
review the global climate and cyclical weather patterns by adapting to
the power of contemporary imaging which alters much of what you know
and take for granted.I  believe that a reasonable person can grasp the
dynamic for seasonal changes via the orbital motion of the Earth but
that means setting aside the old explanation that relies exclusively
on tilt to the Sun.

[The flawed  hypothesis of no tilt/no seasons does have another use
for there is a separate issue involving the variations in the total
length of the natural noon cycles due to the combination of daily
rotation and the separate orbital turning to the Sun.Even if the
rotational orientation or 'tilt' was at 90 degrees to the Sun/Earth
line,an observer would still register the same variations in the
natural noon cycle by which the Equation of Time is applied to create
the 24 hour clock cycle.]

Let me put it another way to see if you can answer with a *minimum* of
verbiage. If the earth's rotational axis was oriented....

I am dealing with planetary comparisons rather than hypotheticals
thereby arriving at solid conclusions so that there are no
speculative 'ifs'.Until you join me in that situation where you
compare seasonal characteristics and orbital specifics between Earth
and Uranus through direct observations only then can the necessary
modification can be appreciated based on a genuine dynamic for
seasonal changes and the actual role of 'tilt'

You want the minimum of verbiage,now you have it .




the earth's rotational axis was oriented to be
perpendicular (90-deg.) to it's orbital plane, instead of inclined
towards Polaris, (Uranus' inclination is close to 0-deg.) would you
agree that locations on the earth such as 45-deg north or south of the
equator, which we call temperate zones, would instead experience a
yearly climate with much fewer variations in temperature? In other
words, no seasons.

.

Relevant Pages

  • Re: Spam Free Alternatives to the Usenet Astronomy Groups
    ... changes.The tendency is to overload daily rotation with both the day ... referencing 'tilt' to the central Sun. ... one revolution around the sun is minimal. ... Referencing 'axial tilt' to the central Sun as the dynamic and cause ...
    (sci.astro.amateur)
  • Re: analemma
    ... the tilt in the planet's axis of rotation relative to its ... You are using the variations in the arc of the Sun as denoting ...
    (sci.astro.amateur)
  • Re: analemma
    ... the tilt in the planet's axis of rotation relative to its ... You are using the variations in the arc of the Sun as denoting ...
    (sci.astro.amateur)
  • Re: Planets and Stars - an idea
    ... 20% - Distance (from Sun) ... everything that is perhaps correct into "Tilt", ... Without the 23:56 rotation, there would be no seasons; ... "Gur Zbba, orpnhfr vg tvirf yvtug va gur avtug-gvzr; ...
    (rec.arts.sf.science)
  • Re: Climate change
    ... >> If the earth had no rotational inclination, it's orbital motion around the sun would *not* produce variable seasons. ... That's why a tilt is a necessary condition for seasons to occur. ... Seasonal changes in climate would no longer exist. ...
    (sci.astro.amateur)
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