How do you know that??? We know from occultation timing that what you say below is not true, though everyone thinks it is.. It is somewhere around +/- 0.5s on average. Sometimes better, sometimes worse.... Worse yet is that it varies constantly, not including the variance, also constantly, of what the camera itself does.. Add in the fact that everyone will get a different result, and it's really fun.. Traffic on the Net and what your computer is doing at the time all have an effect.. But *You* characterizing *your* camera can, and should, be done.. But a different computer with a different camera, even of the same model, will return different results.. You can certainly pin down the second in which an "event" occurs and claim an accuracy of +/- 0.5s. But not much more.. Proving it is the issue.. I do have your little program saved on the desktop and will show how inaccurate it is as soon as I get a chance.. Maybe Saturday.. Maybe the following week.. This is a well known issue and is why Occultationists developed GPS time inserters accurate to 1 msec using the 1PPS.. I'll let you know what I come up with when I have some data.. Derek I have a typical ping time of 100ms round trip to the Navy time source so my error is no worse than half that. - George Roberts ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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