Precession, Milankovitsch or Equinoxes?

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Andre, Mar 4, 2003.

  1. Andre Registered Senior Member

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    Last edited: Oct 11, 2003
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  3. RDT2 Registered Senior Member

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

    cheers,

    Ron.
     
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  5. NileQueen Registered Senior Member

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  7. blobrana Registered Senior Member

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    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
     
    Last edited: Mar 6, 2003
  8. blobrana Registered Senior Member

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    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?)
     
  9. shadows technocrat:Teach me Registered Senior Member

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    I think it flucuates and it may have something to do with other factors that are not understood.
     
  10. blobrana Registered Senior Member

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    Where did i misplace that presession?...

    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
     

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