Angular acceleration of the earth

To All;

This tread was very enjoyable. I took four months of work, and in that time I searched the web for a place where scientific thought was still evolving. Well I see now that I have found a place where the creators of a site actually back it up with incite and knowledge. I look forward to being a part of this forum.

I am only sad that the knowledge I am lacking, is the knowledge I am planning to learn when I go to college and university in another 8 years when I am 55. That knowledge is formula math. But I have the gift to understand anything and I enjoy reading the formulas and feeling their truths.

As for this tread, I agree with Tom and tvanfandern about those who come to a distinct site only to push their agenda. They do not understand that a forum has the right to be for those who wish to discuss a different view point without being told we are wrong to do so. That is like going to a boy scout site and telling them they should think like girl scouts. I personally believe that all scientific theories are only the next step to a newer theory. That's Evolution.

Thanks for letting me participate; Allen.

I am not making a claim about data that exists but as TVF said many times the data exists and I'm too dumb to find it or understand it. So maybe there is someone else as dumb as me and has a problem with finding something that even I should be able to find. What is TVF saying I don't try to locate stuff he directs me to? Why is simple data so hard to locate? Why is there quite a bit of data that seems to indicate otherwise such as the weather data and the Solar Constant that is said to be averaged to exactly 1AU? Why not simply post the real Solar Constant and end the doubt? Why not measure the redshift of the sun during the orbital cycle? Why not use the method TVF suggests from a satelite and not rely on the same type measurements the church did to correct the calander 300 years ago or so? It is a very simple data set that should be posted. I have never had any proplem with data but the lack of it is quite a problem because as I said above other real data needs to be explained and probed for the benefit of workers in the field that rely on claims being made and maybe are getting misdirected.

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>

[Tom]And the radial acceleration is sufficient to explain why Earth speeds up as it falls closer to the Sun and slows down as it recedes in its annual circuit.

Try a computer experiment, or read chapter six of my book to understand this better. -|Tom|-
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Yes this makes sense to me also. Now why does the earth change its distance from the sun in the first place-what is the cause? Is the orbit slightly unstable due to influence from other planets at various locations relative to earth?

This theme of elliptical orbits is a constant throughout our solar system applying to the moons themselves. Comets have highly elliptical orbits around our sun so how do they stay within our solar system each cycle when they should fly off into space never to return?-does this suggest another companion like two suns in our locality which the comets orbit?

cheers
dave

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>[dave]: Now why does the earth change its distance from the sun in the first place-what is the cause? Is the orbit slightly unstable due to influence from other planets at various locations relative to earth?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Yes, planetary perturbations induce ellipticity into Earth's orbit, so even if it started out circular, it would soon become elliptical. And the amount of that ellipticity changes appreciably over time, within limits.

However, a better question would be "What formation mechanism could possible create a planet in a circular orbit?" That would require an almost perfect balancing of force, speed, and direction of travel.

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>Comets have highly elliptical orbits around our sun so how do they stay within our solar system each cycle when they should fly off into space never to return?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

An ellipse is a closed, periodic orbit. So I don't understand your question. Comets do not come anywhere near any other star, not even the nearest other star (Proxima Centauri). -|Tom|-

Is it not a fact the Newton model of gravity requires the planet to act on the mass center of the central star? This matter was a bone in another forum. If that is true how can a planet perturb the orbit of a planet?

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>[Jim]: Is it not a fact the Newton model of gravity requires the planet to act on the mass center of the central star? This matter was a bone in another forum.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

No. Every mass acts on every other mass. Centers of mass are useless for determining orbits. But they do help us find the simplest coordinate systems for describing motions.

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>If that is true how can a planet perturb the orbit of a planet?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Newton's universal law of gravitation: "Every Body in the universe attracts every other body with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them."

Jim, you seem interested in physics, but not yet educated in it. Why not get a good introductory physics text from the library (there are many to choose from) and work your way through it? You can't get a feel for physics from a Message Board such as this one, or from the Internet. We have very few beginners here, and there are few volunteers on the Internet to teach the motivation and experiments behind basic physics. Your realistic choices are: pay a teacher (university or private tutor) or self-educate. -|Tom|-