For the past 101 years BBC radio stations have been broadcasting a series of six short tones or pips at one-second intervals to mark the precise start of each hour called the Greenwich Time Signal (GTS). On the 5th of February 1924 the pips were introduced and generated by the Royal Observatory, Greenwich and from 1990 on they were generated by BBC in London. These broadcast pips replaced an electrical time coordination system based on the railway telegraph network, which itself was an extension of the mechanical time balls in Portsmouth (1829) and later Greenwich (1833), which enabled navigators aboard ships moored in those places to set their chronometers for the determination of longitude on voyages. We celebrate this spectacular radio signal with a beautiful AI generated wall clock …

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