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|The innovation is the split gnomon which produces a "line of light" at solar noon. To set up a Spot-On Sundial to true north, all you need is the exact time of solar noon at your longitude - you can then rotate the dial till you get the line of light, lock it down, and it is then "spot on" to true North. Design copyright © Piers Nicholson 2001|
The time of solar noon depends on the Equation of Time and on the difference in longitude between your location and the standard meridian of the time zone you are in. It is slightly different for every day of the year. Our unique Solar Noon Calculator will provide you with a table showing the exact time of solar noon for your location for each day of the year.
If you prefer, you can print out the values of the Standard Time Correction, which gives you the amount to add to, or subtract from, the time on your sundial to obtain the time shown by your watch. The Standard Time correction is the sum of the Equation of Time, and the longitude correction; the longitude correction is the time the sun takes to travel between your longitude and the longitude of your standard meridian
Our latitude and longitude page from our sister site, Spot-On Sundials, will help you to find the input data you need for our unique Solar Noon Calculator
Note that our calculator requires that your latitude and longitude be in decimal format. If your co-ordinates are in Degrees, Minutes, Seconds please click here.