Timepieces
World Clock
Time Gadgets
Time Converter
Time Zones
Time Converters
Articles
What is GMT

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 then reinstated for the millennium.

Time power tools

City Clock
Moving time
Sun Time
Season progress
Moon Time
Current phase
place Fast Find - start by typing GMT Tools - check and bookmark ‚Ź≤ Time zone converter by place ūüĆé Time converter by zone ‚ďė What is Greenwich Mean Time?