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John Barentine speaks about the dark sky movement in Southern Arizona
Tucson Amateur Astronomy Association October Meeting
John Barentine, astronomer, historian, and policy maker presents: Dark Sky Southern Arizona 2.0: The Hits (and Misses) Of Our First Year. In-person meeting open to all. Public screening at https://www.facebook.com/TucsonAstronomy.
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National Optical Astronomy Observatory
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