At 9 in the morning the Sun is low in the east, so the shadow points toward the west, toward the fence.

The yard from above at 9 in the morning: the Sun is on the southeast side, and the shadow points toward the northwest.

By noon the Sun is high in the south, so the shadow is short and points north, toward the school.

The chalk lines from 9 in the morning to noon: each line swings a little further round, and each is shorter than the one before.

At 3 in the afternoon the Sun is in the west, so the shadow points toward the east, toward the parking lot.

The yard from above at 3 in the afternoon: the Sun is on the southwest side, and the shadow points toward the northeast.