Joe wrote:

Kurt's post indicated we are talking about time differences that seem incredible to imagine and more importantly incredible to measure.

Joe, Recall that the professor doing the atmospheric gamma ray burst experiment out at Seabase (who has lectured to SLAS a couple of times) was also building nano-second timers. His experiment also is dependent on being able discriminate nano-second time intervals. Clear Skies - Kurt P.S. - Now if someone would just build and sell a video time-stamper with microsecond resolution, that is GPS synchronized and that costs $50 instead of the current market price of _$1500_, I could get back into lunar occultation timing!