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While reading Totality: Eclipses of the Sun by Littman, Wilcox, and Espenak, I learned that the moon's orbital plane is several degrees out of the ecliptic. So it would seem that the Earth-Moon center of mass is noticeably out of the ecliptic plane twice a month. This ought to cause Earth's orbital axis to precess.
poj
----- Original Message -----
From: "Jim Green" <JMGreen@SISNA.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Saturday, October 05, 2002 1:33 AM
Subject: Re: North Pole
I dunno Brian, I have been thinking about his for a few days and I still
don't understand, How about a more detailed tutorial for the
senile. Anyone else want to chime in as well?
Jim
At 06:19 01 10 2002 , the following was received:
A similar question was addressed recently on a navigation list.
While the motion in question does not seem to be fairly
described as precession, the Earth visibly moves out of the plane
of the ecliptic as a center of gravity effect of the Earth Moon center
of mass.
Brian W.
At 01:39 AM 10/1/02, you wrote:
The Earth's spin axis precesses such that we get a moving polar star.
Does the orbital axis precess?
Does the angle between the orbital plain and the spin axis change?
Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen
This posting is the position of the writer, not that of SUNY-BSC, NAU or
the AAPT.
Brian Whatcott
Altus OK Eureka!
This posting is the position of the writer, not that of SUNY-BSC, NAU or
the AAPT.
Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen
This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.
This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.