Pictures: Spectacular Halo of 12/18/01

22-degree arc, tangent arc, 44-degree arc, and circumzenith arc
Arcs to the left and right (you can see the 44-degree arc here)
God, it was gorgeous...
Above the dome (look carefully and you can see very faint arcs coming "out" of the sun at 45-degree angles)
Using the pole to get wide-angle: you can see the arc which goes out horizontally from the sundogs, all the way around the horizon