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- From: scottj@magic.dml.georgetown.edu (John L. Scott)
- Subject: Re: Two high tides (Was: Full moon and tides)
- Followup-To: alt.folklore.science
- References: <scottj-211292091243@iamac-1.dml.georgetown.edu> <1h50c7INNees@news.aero.org>
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- Organization: J. Random Misconfigured Site
- Date: Tue, 22 Dec 1992 21:33:45 GMT
- Message-ID: <scottj-221292163050@iamac-1.dml.georgetown.edu>
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-
- In article <1h50c7INNees@news.aero.org>, shag@aero.org (Robert M.
- Unverzagt) wrote:
- >
- > In article <scottj-211292091243@iamac-1.dml.georgetown.edu> scottj@magic.dml.georgetown.edu (John L. Scott) writes:
- > > The high tide facing the moon is, of course, explained by the gravitational
- > > pull of the moon. However, there have been at least two explanations for
- > > the high tide on the opposite side of the earth:
- > >
- > > A. The moon stretches the earth
- > > B. Centrifugal pseudo-force
- > >
- > > So... which is it, A, B, both, or neither?
- > >
- > Neither. Well, sort of A, I guess -- it depends what you
- > mean by "strethes the earth". Bad ascii graphics follow:
- >
- > _______
- > / \
- > __ / \
- > / \ A B C
- > \__/ \ /
- > moon \_______/
- > earth
- >
- > Points A, B, and C all experience some amount of "pull" from
- > the moon. It's easy to see (as you point out above) that
- > point A is pulled more than B, the center of the earth. It's
- > also easy to see from the above diagram that point C feels
- > less pull than B; therefore C "rises" relative to B, just as
- > A does.
- >
- > Is that what you mean by "stretches the earth"?
- >
- > Shag
-
- Thanks for the reply. I got "stretches the earth" from somebody else's
- post. I took it to mean that the earth's shape was actually deformed to
- the point that it had a noticeable effect of the oceans. I was skeptical
- of that idea.
-
- So, are you saying that the moon pulls the earth away from the water on the
- far side? That certainly sounds reasonable to me.
-
- --John L. Scott
-