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Not my field - maybe you could post to 'Earth Science' - sounds more their kind of thing.

cheers,

Ron.

http://www.homepage.montana.edu/~geol445/hyperglac/time1/milankov.htm#Precession

In this link, I notice that in the diagram at the top it is talking about periodicity of 23,000 years, but the picture shows a half cycle of 10,500 yrs., which would double to 21,000. And 5,250 x 4 = 21,000 yrs. A discrepancy in that source I would say.

:m: false aralia ;)

precession of the equinoxes is the change in the direction that earths axis points, it wobbles about a cycle of 26000 years.

the earths orbit is not circular, it`s elliptical and the Perihelion, and Aphelion points change overtime ,this has nothing to do with the earths axis.
it has to do with the relativistic movement of the earth.

I would perhaps look-up Einsteins theories on the relativistic position of mercury (during the 1904 eclipse?)

http://www.mapleapps.com/maplelinks/html/mercury.html

Yes, the other planets `regulate the orbit of the earth etc ( and via versa).
Venus for example is in a harmonic orbital relationship (through gravity) with the earth.

( the same sort as why the moon always faces us).

I think that mars precession is 17000 years, this has a relationship with how dense and fluid the core is, so over time it may change...however it will not influence the orbital motion , or inclination around the sun.

I imagine that the orbit is stable and that it would be the `same`in a billion years time , while the axis precession may have changed radically....

I don`t think that there is a relationship between the two ideas...

(or did i not get the question?)

I think it flucuates and it may have something to do with other factors that are not understood.

Doh!

i have it on my site...But i tried to do a search on google...i didn`t find any figures, you may have better luck...

But this link will point out the technique.

http://mars.jpl.nasa.gov/MPF/science/rotational.html