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The '''Greenwich Time Signal''' ('''GTS'''), popularly known as '''the pips''', is a series of six short tones broadcast at one-second intervals by many [[BBC Radio]] [[List of BBC radio stations|stations]]. The pips were introduced in 1924 and have been generated by the BBC since 1990<ref>{{cite journal |first=Jim |last=McIlroy |title=Network Radio: New Time and Frequency distribution system |url=http://www.bbceng.info/Eng_Inf/EngInf_40.pdf#page=5 |format=pdf |journal=Eng Inf |date=Spring 1990 |issue=40 |access-date=30 May 2012 |archive-url=https://web.archive.org/web/20150923182823/http://www.bbceng.info/Eng_Inf/EngInf_40.pdf#page=5 |archive-date=23 September 2015 |url-status=dead }}</ref> to mark the precise start of each hour. Their utility in [[calibration]] is diminishing as digital broadcasting entails time lags.
[[Greenwich]] is a town in south-east London that has a long history of providing tempo-spatial datums.
Since 1833, the passing of 1pm has been precisely announced to anyone looking from many
miles around by the drop of the [[Time Ball]], as it slides down its mast.
==Structure==
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