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Site Characterization Data
Real Time Seeing
Daily Seeing Data & Plots
Historical Seeing Data
Last updated or reviewed June 8, 2016.
NOAO is the national center for ground-based nighttime astronomy in the United States and is operated by the Association of Universities for Research in Astronomy (AURA). under cooperative agreement with the National Science Foundation. If you would like information about solar astronomy, visit the National Solar Observatory. If you would like information about radio astronomy, visit the National Radio Astronomy Observatory.