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Gray
156621.  Wed Mar 14, 2007 6:25 pm Reply with quote

Quote:
but was difficult to spot because the two cycles interefere with each other in the same way that two radio waves might cause interference.

I think Fourier analysis has been around for long enough to distinguish two interacting frequencies...

The Precession of the Equinoxes comes up with other cycles that affect climate as well:
Quote:
Over longer time periods, that is, millions of years, it appears that precession is quasiperiodic at around 25,700 years, however, it will not remain so. According to Ward, when the distance of the Moon, which is continuously increasing from tidal effects, will have gone from the current 60.3 to approximately 66.5 Earth radii in about 1,500 million years, resonances from planetary effects will push precession to 49,000 years at first, and then, when the Moon reaches 68 Earth radii in about 2,000 million years, to 69,000 years.

http://en.wikipedia.org/wiki/Precession_of_the_equinoxes

 

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