Make: Geometry

If you don’t have a 3D printer, create a right triangle from cardboard or foam

core with an angle at the base equal to your latitude, and create a base it can

stand on. In other words, make an equivalent in cardboard of the gnomon

created by sun_dial_gnomon.scad. Figure 12-5 shows the gnomon, created

for 34.1 degrees latitude.

We marked our example in early April, where the Equation of Time is about

-3 minutes. That means that the sun gets where it needs to go 3 minutes

late. So, to make up for that, we would observe 11 AM at 11:03, noon at 12:03

PM, and so on. If you did this in, say, mid-October when the Equation of Time

is about +12 minute ...