The US Naval Observatory plays an important role in providing accurate time and astronomical data to the US Navy, other branches of the US military, and the general public. It is responsible for the development, maintenance, and operation of the US Naval Observatory Master Clock, which is the principal time standard for the United States. It also conducts astronomical research, provides positional data for navigation and precise timing services, and maintains the USNO Astronomical Almanac. Additionally, the Observatory serves as the official source of time for the United States and its territories.

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