Kevin asked: >Whats the difference between a "train" and a "wake"? >(No puns Wayne) :) It's a matter of those seconds that now tick off in Wayne's head....anything longer than 0.5 seconds is considered a "train" while anything less is normally called a "wake." For the NAMN Train Study, this terminology is not reported to Mark Vints, only durations.....ie. 0.5, 1.0, 2.0, 3.0........ Mark Davis MeteorObs@charlestondot net