| Topic: |
Science > Physics |
| User: |
"Dave Torgerson" |
| Date: |
02 Dec 2003 01:10:46 PM |
| Object: |
Moon Spin Axis |
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
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| User: "Dave Torgerson" |
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| Title: Re: Moon Spin Axis |
03 Dec 2003 10:46:51 AM |
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"Dave Torgerson" <trapper1199@comcast.net> wrote in message
news:Ws5zb.401493$Fm2.411212@attbi_s04...
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
That should read: If the moon does NOT spin how is a spin axis
determined?
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| User: "Uncle Al" |
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| Title: Re: Moon Spin Axis |
03 Dec 2003 11:45:52 AM |
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Dave Torgerson wrote:
"Dave Torgerson" <trapper1199@comcast.net> wrote in message
news:Ws5zb.401493$Fm2.411212@attbi_s04...
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
That should read: If the moon does NOT spin how is a spin axis
determined?
Given its mass distibution from orbits of lunar satellites, its
moments of inertia are directedly calculable. Pick any axis you like
and spin it up by the book. If it has three different moments of
inertia, then the middle inertial axis will tumble rather than stably
rotate.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
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| User: "Dave Torgerson" |
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| Title: Re: Moon Spin Axis |
02 Dec 2003 01:16:42 PM |
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"Dave Torgerson" <trapper1199@comcast.net> wrote in message
news:Ws5zb.401493$Fm2.411212@attbi_s04...
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
^
not
Sorry.
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| User: "Greg Neill" |
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| Title: Re: Moon Spin Axis |
02 Dec 2003 02:32:40 PM |
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"Dave Torgerson" <trapper1199@comcast.net> wrote in message
news:Ws5zb.401493$Fm2.411212@attbi_s04...
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
With reference to the background of distant stars.
The Moon spins on its axis with a period of about a
month with respect to that frame of reference.
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| User: "Sam Wormley" |
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| Title: Re: Moon Spin Axis |
02 Dec 2003 01:19:03 PM |
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Dave Torgerson wrote:
In a recent SA article on the moon it states that the spin axis is
1.5 degrees from the perpendicular to the plane of earth orbit around
the sun.
If the moon does spin how is a spin axis determined?
What do you mean "if the moon does spin"? If it didn't
spin, we would see all sides of the moon from the Earth.
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