• USNO Astronomical Applications
  
  The Astronomical Applications Departmentof the U.S. Naval Observatory computes, from fundamental astronomicalreference data, the position, brightness, and other observablecharacteristics of celestial bodies, as well as the circumstancesof astronomical phenomena. This information is of criticalimportance to navigation, military operations planning,scientific research, surveying,
  air almanac almanacs astronomical astronomy eclipse moonrise moonset nautical naval phenomena positions sunrise sunset twilight
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