Greenwich Time Ball

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Time Ball

What time does the time-ball drop at Greenwich?

In 1833 a red "Time Ball" was installed on the roof of the Royal Observatory Greenwich

  • Daily at 1pm a red time ball drops on the Old Observatory to set World Time

  • It drops at 1pm because the astronomers were busy with their telescopes with the midday sun.

At Greenwich the bright orange time-ball on the observatory roof drops at 1pm every day. It has done this every day since 1833. 1pm was originally chosen to enable the astronomers to undertake telescopic observations at noon. The tradition is maintained today for the benefit of tourists.  NB In summer it drops at 13:00 (1pm) BST or 12:00 (Noon) GMT.

In Washington DC, USA the time-ball was installed in 1845 and dropped every day at noon.  It was discontinued and has been reinstated for the millennium.
News:

USA & Canada clocks
on Standard Time until:
Sunday 11 March 2012 2am local time

Europe / UK clocks
on Standard Time until:
Sunday 25 March 2012 01:00 GMT
 

UK clocks change trial being considered
Have your say YES  or NO

Australia clocks
on Daylight Saving Time 

Cuba will end DST two weeks later this year
Delayed to 13 November 2011 at 01:00
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Greenwich Mean Time

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