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  1. Time as adjusted to achieve longer evening daylight, especially in summer, by setting the clocks an hour ahead of the standard time.
The artificial moving of clock time relatively to the Earth's time, so that the evenings appear longer at cost of later dawns. It was introduced in the UK during WW2, to reduce the need for artificial light in the working day, and became known as British Summer Time, one hour ahead of Greenwich Mean Time that is the international meridian time. (In fact that has slipped fractionally thanks to Continental Drift carrying NW Europe, with the British Isles being on the same continental plate, NE at about 20mm/year - 1 metre in 2 centuries! For accurate work a corrected version called Universal Co-ordinated Time is used.) Despite its introduction being over 70 years ago it is still contentious in the UK, partly because of the marked differences in day-lengths and their seasonal differences between the North of Scotland and the South of England. It is also responsible for a very widely-held notion that somehow the two annual changes lose or gain you an hour in bed. The official change-time is at 2am but many change their clocks before going to bed, hence their "loss" or "gain". Most European countries are an hour ahead of GMT during the Winter, so 2 hrs ahead in Summer. NB: the actual daylight lengths do not change - only our references to them.
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Darlene Tromp

Lvl 13
2y ago

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