December 22, 1999 was the night of the allegedly really bright full moon, so I spent a few hours on the deck with camera and tripod. I used the following factlets to get my exposure time: 1) "sunny 16 rule": if your film ASA is x, and you're shooting in full sunlight at f/16, your exposure time should be 1/x seconds. 2) Full moonlight is about the same color as full sunlight, but about 1e-6 times as bright. 3) For extremely long (or extremely short) exposure times, add a stop of exposure to account for reciprocity failure. (Meaning: film density is marvelously predictable as a function of exposure, until you get to the extremes of exposure time.) My film was ASA200, so for f/16 I figured 1/200 s for full sunlight, 5000 s for full moonlight, and doubled to 10000 s for good measure. That's a 2 hr 47 min exposure, which I didn't have sufficient patience for, so I switched to f/4 for a ~10 minute exposure. Even then, it took 2 hours to do 12 shots.