This daily time signal in the city is one of the favourite Edinburgh Castle attractions. If you can time your visit to match up to the 1 o'clock firing of the gun, then you will be better organised than the bit of luck I had. I just happened upon it by luck.
Popular rumour has it that the signal is at 1 pm and not 12 o'clock midday so as to cut down the number of shells required for the time signal. Very Scottish indeed.
If you are sitting comfortably even if you are ready for it to fire, get ready to jump. I promise you will if you are as close as the photographer was.