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- Xref: sparky alt.sci.planetary:613 sci.astro:14463
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- From: cain@geomag.gly.fsu.edu (Joe Cain)
- Subject: Re: Solar eclipse Question
- Message-ID: <1993Jan27.224513.18211@mailer.cc.fsu.edu>
- Followup-To: sci.astro
- Sender: cain@gly.fsu.edu
- Nntp-Posting-Host: geomag.gly.fsu.edu
- Organization: Florida State University Geology Dept.
- References: <1993Jan21.230333.46626@kuhub.cc.ukans.edu> <1jp9fbINN9nj@gap.caltech.edu>
- Date: Wed, 27 Jan 93 22:45:13 GMT
- Lines: 36
-
- In article <1jp9fbINN9nj@gap.caltech.edu> leroy@cluster.gps.caltech.edu (Stephen Leroy) writes:
- >In article <1993Jan21.230333.46626@kuhub.cc.ukans.edu> christos@kuhub.cc.ukans.edu writes:
-
- >>1. Is the moon rotating around the earth in a single plane sothat every 29 days
- >>it comes in between the sun and the earth?
-
- >Since the moon is not in the Earth's orbital plane, we don't get eclipses
- >every 29 days.
-
- <much deleted above.>
-
- This brings up a point that is mentioned in Wagner's "Introduction to
- the Solar System" (p. 208) that has been nagging me. He states
-
- "Unlike most planetary satellites, the Moon does not orbit in
- its planet's equatorial plane. Instead, it orbits nearly in the
- ecliptic plane, with an orbital inclination of 5.15 deg. Various
- pertubations cause this value to vary between 4.95 and 5.33 deg. The
- fact that the Moon does not orbit in the Earth's equatorial plane may
- be a clue to its origin, indicating that it is a captured object."
-
- I have not seen any such statement elsewhere, though it is the
- kind of thing that might be buried in Hartmann and I missed. My
- questions are:
-
- 1. Is the geometry described true?
-
- 2. Has anyone speculated on the relation to the origin of the
- Moon?
-
- 3. Are there other satellites orbits similarly oriented?
-
-
- Joseph Cain cain@geomag.gly.fsu.edu
- cain@fsu.bitnet scri::cain
- (904) 644-4014 FAX (904) 644-4214 or -0098
-