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#1
Mar1214, 06:51 AM

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I'm not sure if this belongs in Astronomy or Astrophysics.
Todays APOD featured the rotation of the sun about its own axis. It seems to me that the axis of rotation of the sun should be aligned with the axis of rotation of the plane of rotation of the planets, i.e. the ecliptic, or more accurately the invariable plane of the solar system. Wikipedia says: Most of the bodies of the Solar System orbit the Sun in nearly the same plane. This is likely due to the way in which the Solar System formed from a protoplanetary disk. Probably the closest current representation of the disk is known as the invariable plane of the Solar System. The Earth's orbit, and hence, the ecliptic, is inclined a little more than 1° to the invariable plane, and the other major planets are also within about 6° of it.What about the inclination of this invariable plane with the plane of rotation of the sun about its own axis? Is there a mechanism to make the deviation in solar/planet axis inclination converge or diverge with time? What about the inclination of the solar system's plane with respect to the galactic plane? What about the inclination of the Milky Way's plane compared to those of nearby galaxies? Are there clusters of galaxies that seem to share coaligned axes of rotation? If yes, that suggests that they may have evolved from the same protoplasmic disc. 


#2
Mar1214, 08:28 AM

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What about the inclination of earth's axis of rotation w.r.t. the plane of the ecliptic (23 degrees)? Or that of Uranus (97.8 degrees)?



#3
Mar1214, 09:36 AM

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Keep in mind that the rotations of the planets are not nearly as strongly correlated with the invariable plane as are the orbits of the planets. Flin, P. The Search for Galaxy Orientation in the Local Group in Proceedings of the 192nd symposium of the International Astronomical Union, 1999. http://adsabs.harvard.edu/full/1999IAUS..192..443F 


#4
Mar1314, 12:38 PM

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Planes of rotation



#5
Mar1414, 06:06 AM

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