UTC 13


UTC 13 : Abbreviation of Coordinated Universal Time, the standard measurement of time. Universal time (UT), based on the Earth's actual rotation, was replaced by coordinated universal time (UTC) 1972, the difference between the two involving the addition (or subtraction) of leap seconds on the last day of June or Dec. National observatories (in the UK until 1990 the Royal Greenwich Observatory) make standard time available, and the BBC broadcasts six pips at certain hours (five short, from second 55 to second 59, and one long, the start of which indicates the precise minute). Its computerised clock has an accuracy greater than 1 second in 4,000 years. From 1986 the term Greenwich Mean Time was replaced by UTC. However, the Greenwich meridian, adopted 1884, remains that from which all longitudes are measured, and the world's standard time zones are calculated from it
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