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Old April 30 2013, 04:42 AM   #5
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Location: Huntsville, AL, USA
Re: Time (but not travel)

To answer the OP's question, something based on the vibration of the hydrogen atom might be a good option, but that may have issues based on the location of the observed atom. A better option for a galactic civilization might be something based on the frequency of a known pulsar, since that would be external and visible to all observers.
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