evening pillar (Blue Mountains)

Earlier in the day we had seen a Sun pillar. Charles photographed it. But I noticed a pillar under the Moon later. That was a first! By the time I had the camera ready, it was starting to fade. Made me wonder if it is a function of elevation.

Canon 40D, 18-55 EFS at 35, tripod mounted. 0.4 seconds, f/4.5, ISO 1600, daylight white balance, RAW, minor adjustments in DPP.