Re: equinox

Pablo Flores wrote:
> It seems very similar to LeGuin's "Exile Planet", that I just
> commented, but it's different enough to presume you're talking about
> something else. Couldn't it be Robert Heinlein's "Double Star"?
> (I've not read it, I just remember the title).
No.  The books are called Winter on _______ and Summer on _______ and
Spring on ________, where the blank is whatever the heck the planet is
called.  I don't remember.

> Yet another possibility would be precessional change. I read about
> Mars and precessional seasons in a book by Carl Sagan. The axis of
> the planet revolves around a theoric axis and this causes the axis
> to vary its inclination. The cycle is very slow, about 25,000 years
> to complete a circle.
That's what Earth does, except that our tilt is less extreme, and not
tied to the precession (changes in tilt are believed to be the cause of
the ice ages, it's thought that our giant moon may stabilize our
planet's tilt, incidentally, which means that if that's true, there'd
probably not be intelligent life on moonless worlds).  That's what the
astrological "Age of Acquarius" is all about - and MAYBE what the
Christian Fish is!  There's a theory that it represented the change that
occured in the 1st century from the age of Aries to the age of Pisces.

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