Time Service Department
http://tycho.usno.navy.mil/

U.S. Navy


This site from the US Navy is the official source of time for the Department of Defense (DoD) and the Global Positioning System (GPS), and a Standard of Time for the United States. It features numerous links to other useful time and GPS-related sites.

This resource is referenced here:
Subject: Geography:Geospatial
Resource Type: Scientific Resources:Collection, Overview/Reference Work
Theme: Teach the Earth:Course Topics:GIS/Remote Sensing