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Exact Time - Atomic Clock Time

Related Websites

U.S. Time Zones
U.S. Time zones map and SunClock - shows the day/night regions of the Earth
World Time Zones
Map of world time zones by the Royal Observatory of Hong Kong.
Horology Index
A Walk though Time
A descriptive look at the history of timekeeping from ancient to modern methods

'The mathematician's patterns, like the painter's or the poets, must be beautiful; the ideas, like the colours or the words, must fit together in a harmonious way. Beauty is the first test: there is no permanent place in the world for ugly mathematics.'

Godfrey Hardy
(1877-1947)