A location used for observing celestial events like stars, planets, and astronomical phenomena. Observatories can contain instruments like telescopes and other devices to measure electromagnetic radiation.
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An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysics, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Historically, observatories were as simple as containing an astronomical sextant (for measuring the distance between stars) or Stonehenge (which has some alignments on astronomical phenomena).