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Calculators & Time
Deep Research - Time
Compute Local Apparent Sidereal Time - Sidereal time is the hour angle of the vernal equinox, the ascending node of the ecliptic on the celestial equator.
Daylights Saving Time - Why do we have Daylight Saving Time? History from Benjamin Franklin to the present. US law and practice. Worldwide time change dates.
Greenwich Mean Time - Greenwich, England has been the home of Greenwich Mean Time (GMT) since 1884. GMT is sometimes called Greenwich Meridian Time because it is measured from the Greenwich Meridian Line at the Royal Observatory in Greenwich.
Internet Clock - The NIST Internet Time Service (ITS) allows users to synchronize computer clocks via the Internet.
Realtime clock
Time and Date Globally - time and date information globally.
Time Service Dept. - 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
Time Zone Conversion
Time Zone Converter
Time Zones for PCs - Find the current time for anywhere in the world. Free software download includes time zone converter, desktop clocks, and alarms.
Trout's Internet Clock - Desktop Clock with Skins, Scheduler, Time Synchronizer and World Clocks for different Time Zones.
USNO Master Clock Voice Announcer - The USNO Master Clock Voice Announcer on the web is a live MPEG3 stream of the audio from the USNO telephone time announcer.
USNO Master Clock Animated GIF Clocks
World Clock - time around the world.
World Time - WORLDTIME is a service featuring an interactive world atlas and information on local time as well as sunrise and sunset times in several hundred cities
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