oh No for some reason or another this link has been changed or removed but here is what I got from this site
Quote:
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)
Of course the Sun won't keep on going in this direction forever. In fact we approximate it's motion by an 'epicycle' on top of the mean motion around the Galaxy. The period of oscillation in and out of the plane of the galaxy (up and down) is about 70 million years. This means that we pass through the Galactic midplane about every 35 million years . end quote.
OK this is weird the link now seems to be working!
Please give credit to Curious about Astronomy, or Ask an Astronomer for this Link and Quote
Dennis
