United States Naval Observatory
Overview
The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States
, with a primary mission to produce Positioning, Navigation, and Timing (PNT) for the U.S. Navy and the U.S. Department of Defense. Located in Northwest Washington, D.C.
, it is one of the pre-1900 astronomical observatories located in an urban area; at the time of its construction, it was far from the light pollution
thrown off by the (then-smaller) city center.
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
, with a primary mission to produce Positioning, Navigation, and Timing (PNT) for the U.S. Navy and the U.S. Department of Defense. Located in Northwest Washington, D.C.
Washington, D.C.
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....
, it is one of the pre-1900 astronomical observatories located in an urban area; at the time of its construction, it was far from the light pollution
Light pollution
Light pollution, also known as photopollution or luminous pollution, is excessive or obtrusive artificial light.The International Dark-Sky Association defines light pollution as:...
thrown off by the (then-smaller) city center.
Unanswered Questions
