The "Royal Observatory" was re-named on 1 July 1997.
Time
and Frequency Division
An operating unit of the Physics Laboratory of the
National Institute of Standards and Technology (NIST). Based in Boulder,
Colorado the site has many facts and information about time...
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.
