Draw an inverted bowl – i.e., a horizontal line (exactly 10 inches long), with a big semi-circular upside-down “U” connecting the ends of that horizontal line. This is a picture of the ground and sky. Draw a little tiny person (you) at the mid-point of the horizontal line. Label the left end of the line “S” (for south) and the right end “N” (for north). Now, go find a protractor (or you can use trig to construct the angles correctly by some other methods), and draw three parallel, equally-spaced lines, one inch apart (and thus two inches between the two outer lines), slanting from upper left to lower right, at an angle of 30 degrees from the horizontal – with the middle line going from you out to the inverted semi-circle above and to your south (left). Only show the parts of the lines INSIDE the inverted bowl. These slanted lines represent an edgewise view of the big circular arcs of the sun on the solstices and equinoxes. They show the boundaries and center-line of the “solar window” … like a big map of the tropics and equator, extended out onto the sky, as seen from where you are on the earth.
For this drawing you’ve just done, what is the latitude of your location?