Depot of Charts and Instruments | National Geospatial-Intelligence Agency Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Depot of Charts and Instruments

Dec. 6, 1830: Depot of Charts and Instruments

On Dec. 6, 1830, the Department of the Navy established the Depot of Charts and Instruments to care for its chronometers, charts and other navigational equipment. By 1835, it had begun chart production, and in 1838, astronomical observations and original hydrographic research began. With an expanded mission, the agency was renamed the United States Naval Observatory in 1844. Today, its mission includes determining the positions and motions of the Earth, Sun, Moon, planets, stars and other celestial objects; providing astronomical data; determining precise time; measuring the Earth's rotation; and maintaining the Master Clock for the United States.

Download