UT (at least in the form of UTC, Universal Time Coordinated) is the current successor to GMT (Greenwich Mean Time). UTC is based on atomic time (with its constant rate, which was based on the astronomer's Ephemeris Time), with leap seconds being inserted as required to maintain synchronism with the earth's rotation. The two are slightly different, hence different names.
12:00 GMT is almost the same as 12:00 UTC, give or take about half a second or so. I suspect that most values reported as GMT are really UTC, GMT being used for historical continuity in the UK. Gordon At 09:18 AM 2/24/99 , David Higgon wrote: >Dear All, > >You'll have to forgive my ignorance, but what is the difference between GMT >and UT? > >In practical terms, isn't 12:00 GMT the same time as 12:00 UT? If so, >what's the point of renaming something we've already got? Gordon Uber [EMAIL PROTECTED] Reynen & Uber Web Design http://www.ubr.com/rey&ubr/ Webmaster: Clocks and Time http://www.ubr.com/clocks/
