Yosemite by Moon and Star, photo by Harold Davis. View this image larger.

I spent most of Tuesday night on Glacier Point, hoping for Draconid meteor showers but settling for star trails. I brought six batteries and two cameras. I set one of the cameras to automatically capture a series of exposures, with statistical stacking in mind; with the other camera I played.

This one is a combination of sixteen exposures, taken early enough in the night that the moon was still lighting Tenaya Canyon and Half Dome.

Back to my sleeping bag on the Valley floor at about 6AM and time to get some sleep. My ear plugs in place, I was startled awake a short time later by a deep rumbling followed by sirens and helicopters. Bears dancing on cars, setting off car alarms? Investigation showed that a shelf of Glacier Point rock had tumbled down on top of Curry Village. Luckily no one was badly hurt, although they did shut Curry down. Did my night time work disturb the geology?

[Nikon D200, 10.5mm digital fisheye, 16 ISO 100 exposures, foreground at 8 minutes and f/2.8, 15 star exposures at 4 minutes and f/4, tripod mounted, stars combined in Photoshop CS3 Extended using the Statistics script.]