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Noon Gun - Virtual Reward 2.0 Virtual Cache

Hidden : 06/04/2019
1 out of 5
1 out of 5

Size: Size:   virtual (virtual)

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Geocache Description:

Noon Gun - Virtual Reward 2.0

1) Near GZ you will see the Noon Gun - Take a Photo of yourself or a personal item showing the noon gun and Table Mountain in the background - please include this picture in your online log

Only accessible from 08:00 until 16:00 week days
08:00 until 13:00 on Saturdays
Closed on Sundays and public holidays

The tale behind the 12pm boom from Signal Hill and how you can go and experience it

Arriving at Lion’s Battery, situated on the lower slopes of Signal Hill, the first thing I notice is the incredible view that lies before me. On a clear day, the famous mound rewards visitors with spectacular views across the Table Bay harbour, the central city, the Atlantic Ocean and Table Mountain. Today is no exception. 350m in height, Signal Hill separates Sea Point from the City Bowl and although it is named after its original use of flying signal flags to communicate with nearby ships, the renowned hill is also home to the Noon Gun.

I check my wristwatch, it is a little before quarter to 12. I specifically wore it this morning (along with my other three watches) so that I could change the time of each watch accordingly as the blast occurs. As the quarter-to mark draws near, a small crowd gathers around the cannons excited to witness Cape Town’s oldest tradition. Having managed to survive a Dutch and British colony, a Dutch renaissance, the British occupation, the Anglo-Boer War, the rise and fall of apartheid and later a new democratic society – it is a very deserving title.  Whether you are a long-term Capetonian or a visitor to the Mother City, the tradition of firing the Noon Gun never ceases to amaze or surprise people.

Malgas, a member of the SA Navy steps forward in front of the excited crowd. He will be our cannoneer today. With some time still to spare Malgas begins to raise the red flag BRAVO, which is a warning signal for the gunfire. The flag will subsequently be lowered after the firing. With BRAVO flying high, Malgas begins to tell us the history behind the 12pm boom.

The Blasting Apparatus
The green cannons (there are two of them, just in case one fails) are 219 years old and have been fired since February 1806. The guns were brought to the Cape in 1795 during the British occupation. The crest of George Rex (founder of Knysna) as well as the British crown is still visible on the machinery as well as the markings of W & Co (Walker and Company). The serial numbers 330 and 249 can also be seen, thus making is relatively easy to trace the old weaponry back to it date of creation.

Although both ship weapons are loaded six days a week (not on a Sunday or Public Holidays), only one is fired where the second is used as a backup. Should there be a misfire, the cannoneer’s colleague is on standby and will quickly change over and fire the second gun. The original smoothbore muzzleloaders are still used today and are reportedly the oldest daily used guns in the world. Each cannon weighs more than a whopping two tons and are loaded with 1.5kg of gunpowder.

For over a century the muzzleloaders were housed and fired from the Imhoff Battery near the Castle of Good Hope. The practice of the noon firing, however, wasn’t as simple as some trigger-happy individuals wanting to let of a bit of steam. The shooting was two-fold – for time-signal purposes and as a mark of respect. Shortly after the Imhoff Battery was destroyed in 1896, the cannons were moved to the Castle. However, in 1902 (most probably owing to their deafening volume), it was decided that the devices would be moved to Lion’s Battery on Signal Hill.

The History Behind the Boom
Owing to the Cape of Storms’s bad weather – the high sea and big winds – many vessels travelling around Cape Town took refuge in the sheltered Table Bay. However, after staying for a couple days, the ships would experience a loss of time owing to their inaccurate time keeping methods. Thus, the British decided to fire a cannon at (more or less) noon everyday to act as a time signal for sailors enabling them to check that their marine chronometers were correct. A marine chronometer is a precision instrument used aboard ships to help calculate longitude – a rather vital component for ships navigating by sextant on the high seas.

Is the explosion 100% accurate every time?
Believe or not, but yes it really is. Originally the guns were fired according to a flare set off at approximately 12pm from the South African Astronomical Observatory. After seeing the flare the Noon Gun artilleryman would then fire the Noon Day gun. However, this became unreliable and the SA Navy began to use the City Hall clock situated at the Cape Town parade as the suitable time. However, this too became unreliable as they soon realised that, while the Noon Gun was using the City Hall Clock for the accurate time, the City Hall Clock was using the Noon Gun to reset their clock.

Nowadays, it is far more precise. An electrical signal is sent from the Astronomical Observatory (which has an unfailingly accurate atomic clock) a few milliseconds before noon. This burst of energy zips across the telephone lines, ignites the firing cap on the cannon, sparks the gunpowder and Boom! the cannon goes off at 12pm sharp (not a millisecond off). Allowing for all locals to use the opportunity to check and reset their watches and for all unbeknown first-time visitors to jump out of their socks as they are given a rather startling introduction to Cape Town.

After loading the cannons and as the clock nears noon, we are moved a couple metres away from the blast-area. Malgas begins the count down as he checks his own wristwatch:

“15 seconds.” (My fingers are in my ears.)

“10 seconds.”

“5 seconds.” (I tell myself not to get a fright.)

12pm (sharp): “BOOM!”  

Slightly startled by the volume of the blast, I quickly check all my watches – resetting them according to the explosion. Now I too live life by cannon-time.

Fun Facts about the Noon Gun in Cape Town

  • During the 19th century, it was scarce to have the accurate time and therefore, all came to rely on the gun for the accurate time. Travellers from Cape Town were often asked if they had the correct ‘gun-time’ as the Noon Day firing was accepted as the ultimate accurate time.
  • On 7 January 2005, both the main cannon and the backup cannon failed due to technical difficulties. This was the first time in 200-years that the cannons did not fire as per schedule.

Ref : Info taken from

Virtual Rewards 2.0 - 2019/2020

This Virtual Cache is part of a limited release of Virtuals created between June 4, 2019 and June 4, 2020. Only 4,000 cache owners were given the opportunity to hide a Virtual Cache. Learn more about Virtual Rewards 2.0 on the Geocaching Blog.

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