tycho.usno.navy.mil: Cesium Atomic Clocks
Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.
gtyme.org: Greentyme - Every Body Needs It - Green Time
Using a patented KinderClock Chronichron, this site simultaneously displays both standard time's fixed hours and natural time's variable lengths of days and nights.
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