The primary significance of the Antarctic Circle is astronomical. It marks the northernmost latitude in the Southern Hemisphere where the sun can stay above the horizon for a full 24 hours—a phenomenon known as the . Conversely, during the winter solstice, it is the northernmost point where the sun does not rise at all, resulting in Polar Night .
Unlike its northern counterpart, the Arctic Circle, which encompasses parts of eight countries, the Antarctic Circle crosses almost no permanent human settlements. It largely encircles the continent of , an icy landmass covered by a massive ice sheet that holds about 70% of the world's fresh water. The region is characterized by extreme conditions: Antarctica - National Geographic Education antarctic circle
The sun remains below the horizon at noon. Geography and Climate The primary significance of the Antarctic Circle is
The sun remains visible at midnight.