- On the equinoxes, the subsolar point is at the equator, and the circle of illumination runs through N and. S. Therefore, the far north and south latitudes of the circle of illumina- away from the subsolar point. On the June solstice, the subsolar point is at the Tropic and the circle of illumination passes through. S. Which latitudes does the circle of illumination pass through on the June solstice? On tion are of Cancer at N and February 26 the subsolar point is at 9S, and the circle of illumination passes through N and S.