Re: Precession of the Equinoxes

In article <Xns97EB9DFC1F960ak47catshotcoolmaild@xxxxxxxxxxxxxx>, AK47
<ak47cats@xxxxxxxxxxxxxxxxxxx> wrote:

Quotation from "The Weather Makers: How Man is Changing the Climate and
What it Means for Life on Earth" by Tim Flannery (Melbourne, Australia:
2005)

"The ?cycle which runs its course every 22,000 [sic] years, concerns the
wobble of the Earth on its axis. During the course of this cycle, Earth's
axis shifts from pointing at the Pole Star [sic] to pointing at Vega. This
affects the intensity of the seasons. When Vega marks true north, winters
can be bitterly cold and summers scorchingly hot."

I cannot understand this. I can see how two other long-term cycles of the
earth's motion (the axial tilt and the orbital eccentricity) can affect
climate, but I fail to see the effect of precession.

Can anyone explain?



precession means a varying axial tilt - hence difference in severity of
seasons for temperate latitudes?

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