To setup the initial layout of the sundial;
Mark an approximate layout using a magnetic compass or using a map to find north
Find true north
Define the layout points NS1, NS2, FP3, and FP4 (survey marks)
Using a magnetic compass, roughly layout the sundial using the dimensions provided. Use a garden hose as the ellipse. A compass only shows magnetic north and our sundial must be lined up with true north. However it’s close enough for the preliminary layout. Keep in mind that this angle can be off by 20 degrees.
After the initial layout, you must find the true north/south line. To do so, mark the shadow at solar noon. (also known as high noon)
A calendar will be supplied with your sundial kit. This calendar will show each day at precisely what time the sun will be the highest in the sky over your school.
In the above example,solar noon is at 11:23 and 57 seconds. (each day/location is different)
After the north/south line is found, place a string line to extend it. The string line can be held in place and stretched by two bricks (not pictured)
Once true north is marked, the four layout points must be set out. All dimensions used to draw the sundial are referenced from these points.