Observatories

Throughout history, humans have watched the stars in the night sky. Observatories were built to aid in the study of celestial objects as a means of measuring time. Many calendars are based upon the information gathered through these observations, including the ...

  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles