The September Equinox
On the equinox, the sun rises directly in the east and sets directly in the west. This is true for both the fall and spring equinoxes. So on two days of the year you can find the exact cardinal directions of East and West by using the sun. The ancients did this when they set up their calendars at Stonehenge and the Mayan pyramid, among others.
The autumnal equinox for the northern hemisphere is the vernal equinox for the southern hemisphere. This must mean our friend Loon is welcoming Spring!