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Time Websites

Royal Observatory Greenwich

The Royal Observatory Greenwich has a wide-ranging treasure trove of information on time & Astronomy.

Clocks

Sundials

Time Research

  • Compute Local Apparent Sidereal Time that is the actual time for your spot on the globe in relation to Greenwich. Outside the USA you will have to know your longitude (that's the East, West one!). Greenwich is at zero degrees Prime Meridian of the World.

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