Re: Fair orbital question

"Spaceman" <spaceman@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
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"Greg Neill" <gneillREM@xxxxxxxxxxxxxxx> wrote in message
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No! Without tilt the Sun would always take the same
path through the sky -- passing directly overhead at
(as viewed from) the equator and halfway up the sky at
at 45 degrees latitude, and skirting around the horizon
at the poles.

But that path would be variant in time for certain days.

How? What days would those be? With no tilt, there can
be no variation in the Sun's path through the sky!

You are missing that important part.

No, you're inventing that part out of thin air.

the timing would be different for further away than the sun
days compared to closer to the sun days.

No it wouldn't. The day hours would equal the dark
hours at every latitude. Even steven. Always.

You must have this or the eliptical path is not actually eliptical.

Why do you say that? The orbital shape or position of
the Earth would have no effect so long as the Earth's
rotation rate were constant and the equator was always
in the plane of the orbit (no tilt).

Cmon Greg!
Stop spitting out textbook ***.
The textbook is wrong.

So far you've not provided a single argument that
challenges the text books in the least.



Where would the path get changed from?

It wouldn't, without the tilt. With the tilt it
will change as it does now.

No, even with the tilt in a perfect orbit.
You do not get seasonal changes.
You get absolute light per time for every day.
perfect is perfect Greg.

Don't be silly. If the Earth is tilted then sometimes
portions of the Earth will have the Sun higher in the
sky at noon and sometimes lower. That alone will
change the insolation for those regions. The
daylight versus dark ratio also depends upon the
tilt, being a geometric effect of the spherical
shape of the planet.

It has no differences even when you tilt the planet.
The only difference would be the tilt.
that does not change the orbital fact that no change
in day times will occur during an orbit.

They can *only* occur if there is tilt. Otherwise
they must be the same all the year round.


You haven't demonstrated, either mathematically or with
a proper model, that that is the case. It should in
fact be clear to you that it is the tilt that is the
major cause of the Sun's annual progression in
path height in the sky, as well as the symmetrical
change in daylight hours north and south.

No problem,
I tried to explain it to you so I guess you will need
the 3D version of why's.

Oh, I'm sure that will help...



Your diagram showed a 2D slice throught the Earth,
and did not depict the effect of latitude.

Clock faces on the Earth you draw and if you really want
to make it orbit perfectally
You make it a geared system so you know how many revolutions
per trip around.
I can visualize a simple gearing that makes the orbit
perfect.
. sorry.
I forget you can not visualize stuff like that, nevermind
actually do it on paper.
sorry again.


Try
again but make a few "edge on" diagrams to accompany
the overhead views, thus showing at what latitude
the Sun would be overhead at various points throughout
the orbit.

Greg, if you take away the tilt and make the orbit
perfect you should already get that the tilt won't change
the sunlight timing on the face per rev.

What does that mean? Take away the tilt and the tilt won't
change ...?

C,mon man.
Do it instead of textbooking it.

I told you. Been there, did it. Got the right answer.
.

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