Do you have a moment to talk about what time is and why we measure it? Learn more at https://www.nist.gov/topics/time-frequency. | National Institute of Standards and Technology (NIST)

In order to keep time accurately, we have always had to set our clocks by the ticks of a better one. Until the 1950s, the best were those set by astronomers based on the position of the sun in the sky. Back then, the most reliable clock was the one at the Royal Observatory in Greenwich, London. In 1847 the railways agreed to use GMT across the entire network. Therefore, the distribution of Greenwich Mean Time via telegraph signals became absolutely crucial. But not everyone could connect or brin

#OnThisDay 1924: The 'pips' (aka the Greenwich Time Signal) began, soon to become an iconic part of radio's soundscape. Find out more about their interesting history here: https://www.bbc.com/historyofthebbc/anniversaries/february/the-pips/ | BBC Archive