If you have the capability to receive WWV (a shortwave receiver with the audio out fed to the computer audio in) you could record an audio timestamp on the audio channel stored in the .avi, however beware, some astronomical post-processing applications have difficulty with this being present in the .avi. But in your case you may not be concerned with this issue. I'd perform a test by recording audio on a sample .avi and then performing any/all post processing steps you intend to perform on the transit video to insure this was not a problem.
-Gary
There is only one constant in our infinite universe; it is change.
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Chairman, Southwest Region of the Astronomical League (SWRAL)
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