Joel, Fun to have you come view the sun with me yesterday! Let's figure out a time to bring your other kids. If you haven't looked at this article, it's very interesting: http://www.skyandtelescope.com/observing/mizar-a-fresh-look-at-an-old-friend... Not only a Mizar A & B both spectroscopic doubles, but the quite distant Alcor is also a double. Hence the reference to the sextuple system by Dave Gary--the reluctant learner ;-) --in the late afternoon today. The article has an image of Mizar A shot with an interferometer that shows Mizar A' (or whatever its proper designation is) at different positions on different dates--the orbital period of the two spectral class A stars is only 20.5 days. At any rate, don't miss the article. John