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Science Forum Index » Geology Forum » Equinox
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| oriel36 |
 Posted: Wed Mar 19, 2008 8:14 am |
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Here is something new -
If you could follow the orbital motion of the Earth,both the Earth and
the moon would show the same orientation to the central Sun -
http://www.awakening-healing.com/images/EarthMoon_mariner10_big.jpg
From an axial rotational orientation perspective you see this from
solstice to Equnox -
http://www.youtube.com/watch?v=nwTrYVBcx9s
In a few days,the true orbital orientation of the Earth with respect
to the Sun ,seen in the first photograph will align with the polar
axis and allied with axial rotation will generate a global symmetry
between daylight/darkness .Although you see the solar radiation/
orbital shadow boundary pivot off the Equator in the video and close
the difference with the polar axis as the Equinox approaches,what is
actually occuring is that a location slowly turns through 360 degrees
with respect to the Sun over the course of an annual orbit and twice a
year,that motion crosses the polar rotational axis.
Human beings can only process one motion and orientation at a time and
this is the main reason this orbital component was and remains
neglected but once it is seen and recognised,it is a lovely addition
to the motions of the Earth.Those who disagree on the basis of a
variable tilting Earth can post their own take on what occurs at the
Equinox in their own thread. |
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| Guest |
| Posted: Wed Mar 19, 2008 11:17 am |
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On 19 mar, 19:14, oriel36 <kelleher.ger...@gmail.com> wrote:
Quote: Here is something new -
*> year,that motion crosses the polar rotational axis.
*>
*> Human beings can only process one motion and orientation at a time
and
*> this is the main reason this orbital component was and remains
*> neglected but once it is seen and recognised,it is a lovely
addition
*> to the motions of the Earth.Those who disagree on the basis of a
*> variable tilting Earth can post their own take on what occurs at
the
*> Equinox in their own thread.
Dear Oriel,
.... of course none will disagree on that Tilting Earth angle point
( although some bothering amplitude wobbling is observed)
Still I am puzzled by your polar rotational axis crossing, did you
mean plane ? jp |
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| Timberwoof |
| Posted: Wed Mar 19, 2008 11:39 pm |
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In article
<c31c960c-b87a-4bc9-840c-9d120dc45438@e23g2000prf.googlegroups.com>,
oriel36 <kelleher.gerald@gmail.com> wrote:
That's not in the least bit surprising. Since the moon is a quarter of a
million miles away from the Earth and the Earth-moon system is 93
million miles away, the maximum angle between them as measured from the
sun is arctan(.25E6/93E6), or .15 degrees. IOW, the planes defined by
terminators of the two planets are very nearly parallel.
Quote: From an axial rotational orientation perspective you see this from
solstice to Equnox -
http://www.youtube.com/watch?v=nwTrYVBcx9s
In a few days,the true orbital orientation of the Earth with respect
to the Sun ,seen in the first photograph will align with the polar
axis and allied with axial rotation will generate a global symmetry
between daylight/darkness .
No, the Earth's rotational axis remains at the same angle with respect
to the plane of the ecliptic that it always has. (Ignoring smaller,
long-term effects.)
What happens is this: As the Earth orbits the sun, the sun passes
through the plane of the Earth's equator. If you are at the equator on
the day of the equinox (either one) then at noon the sun will be
directly overhead.
Quote: Although you see the solar radiation/
orbital shadow boundary
the "terminator"
Quote: pivot off the Equator in the video and close
the difference with the polar axis as the Equinox approaches,what is
actually occuring is that a location slowly turns through 360 degrees
with respect to the Sun over the course of an annual orbit and twice a
year,that motion crosses the polar rotational axis.
Human beings can only process one motion and orientation at a time
Speak for yourself!
Quote: and
this is the main reason this orbital component was and remains
neglected
Actually, any elementary textbook on astronomy talks about this.
Quote: but once it is seen and recognised,it is a lovely addition
to the motions of the Earth.
I knew about this stuff before I was a teenager.
Quote: Those who disagree on the basis of a
variable tilting Earth can post their own take on what occurs at the
Equinox in their own thread.
The axis of the Earth's rotation does not vary on a daily or yearly
basis. You can observe this for yourself by looking at the North Star
every evening for a year. At first approximation, it will always be in
the same place. (It is not exactly on the pole, so it moves around it
through the night, but it is close enough.) The constellations move
around it by the hour and by the day, but that's a result of the earth's
rotation and orbit. If the Earth changed its orbital tilt, then the
point about which the night sky appears to rotate would change from
night to night. It does not. Thus its orbital tilt does not change.
.... much. "Precession of the equinoxes" is a cycle of many thousand
years in which the location of the north pole in the sky changes. This
is also covered in any introductory textbook on astronomy.
The fact that you consider this sort of thing "new" shows me that you
don't know much about basic astronomy, although you desperately want to.
Go get yourself a real astronomy textbook and read it.
--
Timberwoof <me at timberwoof dot com> http://www.timberwoof.com
"When you post sewage, don't blame others for
emptying chamber pots in your direction." ‹Chris L. |
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