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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Royal Borough of Greenwich in Greater London County, England, United Kingdom
 

The Shepherd 24-hour Gate Clock

The Time Ball

 
 
The Shepherd 24-hour Gate Clock Marker image. Click for full size.
By Michael Herrick, April 28, 2018
1. The Shepherd 24-hour Gate Clock Marker
Inscription.
The Shepherd 24-hour Gate Clock
This is one of the earliest electrically driven public clocks and was installed here in 1852. The dial always shows Greenwich Mean Time (GMT). In summer Britain converts to British Summer Time (BST), which is an hour ahead of GMT, and the clock then appears one hour 'slow'.

Being a 24-hour clock, the hour hand marks noon (XII) at the bottom of the dial and midnight (0) at the top. The time shown is accurate to 0.5 of a second.

The Time Ball
The red time ball on top of Flamsteed House is one of the world's first visual time signals. It was installed in 1833 (though the present one dates to 1919) to enable navigators on ships in the Thames to check their marine chronometers.

The Time Ball drops daily at 1300hrs (GMT in winter, BST in summer). It is raised halfway up the mast at 1255hrs as a preparatory signal and to the top 2 minutes before it drops.
 
Location. 51° 28.68′ N, 0° 0.083′ W. Marker is in Royal Borough of Greenwich, England, in Greater London County. Marker can be reached from the intersection of Blackheath Avenue and Great Cross Avenue, on the left when traveling north. Touch for map. Located at the Royal Observatory Greenwich. Marker is in this post office area: Royal Borough of Greenwich, England SE10 8XJ, United Kingdom.
 
Other nearby markers.
The Shepherd 24-hour Gate Clock image. Click for full size.
By Michael Herrick, April 28, 2018
2. The Shepherd 24-hour Gate Clock
At least 8 other markers are within walking distance of this marker. Ordnance Survey Bench Mark (here, next to this marker); Time for everyone (a few steps from this marker); Airy’s meridian line (a few steps from this marker); Greenwich Meridian Marker, 1750-1851 (a few steps from this marker); The Greenwich Meridian Telescope (a few steps from this marker); Bradley’s meridian line (a few steps from this marker); Family Tombstone of Edmund Halley (within shouting distance of this marker); Flamsteed’s Well Telescope (within shouting distance of this marker). Touch for a list and map of all markers in Royal Borough of Greenwich.
 
Also see . . .  Royal Observatory, Greenwich on Wikipedia. (Submitted on May 24, 2018, by Michael Herrick of Southbury, Connecticut.)
 
Categories. Industry & CommerceScience & Medicine
 
The Flamsteed House with the Red Time Ball image. Click for full size.
By Michael Herrick, April 28, 2018
3. The Flamsteed House with the Red Time Ball
 
 
Credits. This page was last revised on May 24, 2018. This page originally submitted on May 24, 2018, by Michael Herrick of Southbury, Connecticut. This page has been viewed 60 times since then. Photos:   1, 2, 3. submitted on May 24, 2018, by Michael Herrick of Southbury, Connecticut.
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