At 1am on Sunday March 26, the clocks at Greenwich’s Royal Observatory will jump forward an hour, signalling the switch to British Summer Time (BST). But why do we do it? Read all about it below, and make sure to visit the Royal Observatory to find out more!

Clocks go forward for British Summer Time

British Summer Time (BST), a measure designed to make the most of daylight during the northern summer, was first introduced in 1916. Picking up on an idea usually attributed to American polymath and printer Benjamin Franklin in 1784, 18th and 19th century campaigners argued that moving the clocks forward would help the nation capitalise on natural light and save energy. Its eventual introduction is thanks to campaigner William Willett, an active equestrian who wanted longer, light-filled evenings in which to play golf. In his self-published 1907 pamphlet ‘The Waste of Daylight’, Willett argued that daylight savings would increase national productivity while decreasing energy consumption and railway accidents. Sadly, he died in 1915 – only a year before his campaign bore fruit.

Shepherd Neame Clock at Royal Observatory Greenwich

Since BST was first introduced to meet the demands of WWI, it has taken on different forms. WWII, for example, saw the clocks go forward two hours for ‘Double Summer Time’. Between 1968 and 1971, the clocks never reverted to Greenwich Mean Time, as perennial Summer Time was trialled across the UK. Finally, the 1972 British Summer Time Act stipulated the clocks be put forward by one hour on the last Sunday of March, and back again on the last Sunday of October.

John Harrison's Clocks at Royal Observatory Greenwich

Throughout its history, BST has provoked divergent responses. Some argue for a return to Double Summer Time or permanent Summer Time, while others have raised concerns about schoolchildren in the far north of Scotland being obliged to go to school in the dark.

The Greenwich Time Ball, Royal Observatory

To learn more about the history of BST, visit the home of time - the Royal Observatory - right here in Greenwich. Stand on the historic Meridian Line, see John Harrison's ground-breaking timekeepers and witness one of the world's earliest public time signals, the Greenwich Time Ball.

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Royal Observatory Greenwich
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Royal Observatory Greenwich

The Royal Observatory Greenwich is home of Greenwich Mean Time (GMT) and the Prime Meridian and one of the most important historic scientific sites in the world.

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