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A sundial must be laid out in a way that reflects its location on the planet. Its latitude and longitude, and the orientation
of the wall that it's attached to, are the factors that will make it work properly.
With your address, I can find your latitude and longitude from one of several web mapping services.
Determining the orientation of the wall that the sundial will call home is a little more involved.
A compass will not give an accurate enough reading of the wall's angle. I will send instructions that will show you how to use the sun's shadow to calculate the angle of your wall. It's very easy and painless! anyone can do in a matter of minutes.
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