The Naval Observatory of the United States ( in English United States Naval Observatory or USNO ) It is one of the oldest scientific agencies in the United States. It is located in the northwest quadrant of Washington DC, and is one of the few observatories located in an urban area. When it was built was far from the light pollution generated by what was then a small town.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
