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    Re: Uses of almanacs for astrology
    From: Lisa Fiene
    Date: 2004 Oct 21, 06:47 +1000

    Actually the earth is an oblate spheroid, sort of squashed at the top
    and stretched at the equateor, and the moon librates (quite a lot) in
    its orbit.
    > ====================
    > This is due to the ellipsoidal shape of the Earth. If the Earth were a
    > uniform sphere, then the gravitational attraction of the Moon (and, to a
    > lesser extent, the Sun) would act exactly through the Earth's centre. But
    > the Earth's ellipsoidal shape upsets that simple geometry. You can think of
    > the Earth as a sphere with a sort of "spare tyre" added round its equator.
    > The total attraction on that extra ring does not pass exactly through its
    > centre, so now there's a slight torque which is trying to align the Earth's
    > equator with the averaged plane of the Moon's orbit. The Moon's orbit
    > wobbles about a lot,

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