AN INTERESTING SUNDIAL in the gardens of Blickling Hall, Norfolk consists of numbered stones laid out around a larger central stone. When someone stands on the central stone, his or her shadow will fall on the stone bearing the hour of the day.. This is an example of an ‘anellematic’ sundial.
IN A COUNTRY SUCH AS ENGLAND, the profusion of sundials seems almost ironic given how often the sky is grey and the sun is hidden. Since the year 2000, the average monthly sunshine ranges from less than 50 hours to a little over 250 hours per month (https://www.statista.com/statistics/584898/monthly-hours-of-sunlight-in-uk/), the variation reflecting the different seasons of the year. The average number of daylight hours varies from 8 in January to 16.5 in July (http://projectbritain.com/weather/sunshine.htm). Using these figures and a bit of basic arithmetic, one can estimate that there is sunshine for about 20% of the daylight hours on an average January day, and about 89% of the daylight hours on an average July day. Roughly speaking, a sundial, which can only be of use when the sun is shining, is likely to be helpful for telling the time in England between 20% and 89% of daylight hours on an average day. Nevertheless, there is a great number of these partially usable timepieces in existence in gardens and on buildings in England. The figures I have calculated make the words of my opening sentence only slightly less drastic than they seem. Yet, relying on sundials as timepieces is, as my wife pointed out, a good interpretation of the words of Samuel Johnson (1709-1784), quoted by his biographer James Boswell (1740-1795):
“The triumph of hope over experience.”
This was not said in relation to sundials, but to:
“…Johnson’s hearing of a man who had remarried soon after the death of a wife to whom he had been unhappily married.” (https://www.phrases.org.uk/meanings/hope-over-experience.html)
In other words, enjoy the sight of sundials in their many shapes and sizes but do not become wedded to them if knowing the time is of importance to you.