http://www.maybeck.com/ztime Fri, 1 Dec 2006 18:37:00 GMT GMT or Z-time has been used for centuries by seamen and navigators in referring to the time at 0 longitude (through Greenwich, England...at the Prime Meridian). Z-time is noted in many navigation texts including texts like "AIR NAVIGATION" by Weems, and also in most of the navigation tables published by the United States Naval Observatory[...] en-us http://www.maybeck.com Fri, 1 Dec 2006 18:37:00 GMT More meteorological articles including Subsidence Inversions and Rapid River Water Temperature Fluctuations. en-us