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Originally Posted by Turtle
Land ho! By jove, I think I've got it! 
The Milky Way Galaxy
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...Considering the sense of rotation, the Galaxy, at the Sun's position, is rotating toward the direction of Right Ascension 21:12.0, Declination +48:19. This shows that it rotates "backward" in the Galactic coordinate system, i.e. the Galactic North Pole is actually a physical South Pole with respect to galactic rotation (defined by the direction of the angular momentum vector). ...
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and
Curious About Astronomy: How often does the Sun pass through a spiral arm in the Milky Way?
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The solar motion on top of it's circular orbit about the centre of the Galaxy (which has a period of about 230 million years) can be described by how fast it is going in three different directions
U = 10 km/s (radially inwards)
V = 5 km/s (in the direction of Galactic rotation)
W = 7 km/s (northwards out of the plane of the Galaxy)
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I had a link saying about that half the galaxies rotate one way and half the other, but I lost it in the shuffle. Damn Three-card-Monte!! Anyway, I think I'm off that fence-post finally. .....................  |
Oh-no, I think I'm on the fence now. Does this mean we're north of the plane according to the galactic coordinate system north or the physical (rotation) north? I think I feel that hemorrhage coming again
~modest
