At 23:55 27/04/02, Kevin Fetter wrote: >You must have a stop watch that measures time in 1/1000 sec. My watch only measures at 1/100 sec. As for my timing accuracy, its 40/100 second or 0.4 seconds. That's 0.2 seconds to star the watch and 0.2 seconds to stop the watch. How good can you measure time to. > >Thanks > >Kevin Kevin, my stopwatch reads to 1/100 second. I utilize its laptime storage capability(50) to store a time on each occasion I see a flash, having started it on a known minute. Thus the consistency of the reaction time is important, for the period measurement, not its absolute value. I entered the cycle number and flash time into an Excel spreadsheet, and fitted a staight line for the cycle number vs Time. The slope of this line is the best estimate of the period. Whats more EXCEL gives me a formal standard deviation of the slope ( and the period), and residual plots. The SD for most days was .003 or .004 seconds. The difference of the observed times and the fitted times was always equal to or better than 0.2 seconds, with quite a few .05 secs or better. This technique is of course quite time consuming and only applicable to slow moving satellites like 88-18A. Tony Beresford ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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