- 1). Check your sundial's manufacturer information. Sundials are only exactly accurate at the latitudes for which they were designed. In other words, a sundial built in Barcelona will not accurately gauge the time in Manchester. You will need to compensate for this later.
- 2). Set your sundial in a sunny area, away from trees. Small saplings also count, Over the years, this sapling will grow and thrive and it will block the sun in the process.
- 3). Set your sundial so that your gnomon points directly north, using a small compass. Compasses, of course, point to magnetic north, so sticklers for accuracy may want to adjust their sundial accordingly to true north, using a magnetic declination map. You can also site your sundial, at exactly noon, local time, so that it also reads the time as exactly noon.
- 4). Adjust your sundial's base so that it matches your latitude, as per your manufacturer's information. A sundial built for 37ºN, but used at 51ºN, will have to be wedged up by 14º. Use a protractor to ensure that your gnomon's angle to the horizontal matches your latitude. Alternatively, you can site along the line of the gnomen at night, until it points directly at the North Star.
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