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| | Greenwich Mean Time (Site not responding. Last check: 2007-11-05) |
 | | UTC WET GMT, Red CET/MET, Green EET, Khaki MSK ]] With the growth of Britain as a maritime nation, mariners kept their timepieces on GMT in order to calculate their longtitude "from the Greenwich meridian." This did not affect ship-board time itself, which was still solar time. |
 | | The daily rotation of the Earth is somewhat irregular (see ΔT;) and is slowing down. |
 | | Although civil time, e.g., the Greenwich Time Signal in the United Kingdom, is now based on UTC, it is still popularly (though erroneously) called GMT. |
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