When does subsolar point strike the most southerly point on the Earth's surface?

The subsolar point, which is the location on the Earth's surface where the sun is directly overhead, strikes the most southerly point—Antarctica—during the summer solstice in the Southern Hemisphere. This occurs around December 21 or 22 each year. At this time, the sun reaches its highest position in the sky for locations south of the Tropic of Capricorn, making it the longest day of the year in that region.