The Antarctic Circle is a significant line of latitude situated in the Southern Hemisphere, marking the point where the sun doesn't set on the summer solstice. The word "Antarctic" is spelled /ænˈtɑːktɪk/, with the stress on the second syllable. The "c" in "Antarctic" is pronounced like "k" because it precedes a "t". Additionally, the word "circle" is spelled /ˈsɜːkəl/ with the stress on the first syllable. So, when referring to the imaginary line of latitude, we say "the Antarctic Circle" /ænˈtɑːktɪk ˈsɜːkəl/.
The Antarctic Circle refers to an imaginary line of latitude located at approximately 66.5 degrees south of the equator, encircling the Antarctic region of the Earth. It signifies one of the five major circles of latitude that mark the Earth's axial tilt and divides the Southern Hemisphere into two distinct zones: the Antarctic Zone to the south and the Temperate Zone to the north.
Being an important geographical boundary, the Antarctic Circle denotes the southernmost point where the sun is visible continuously at least once a year on the winter solstice, which typically falls on the 21st of June. Conversely, on the summer solstice (around December 21st), the sun remains above the horizon for 24 hours within the Circle, resulting in a phenomenon known as the midnight sun.
The area within the Antarctic Circle is characterized by extreme cold temperatures, harsh weather conditions, and a vast expanse of ice, including the Antarctic Ice Sheet. It encompasses the Antarctica continent and numerous surrounding islands, which serve as habitats for various species adapted to the frigid conditions. The Circle also plays a significant role in the study of climate, polar ecosystems, and scientific research, as it demarcates the region commonly referred to as the "Antarctic." Furthermore, it serves as a symbolic limit for expeditions and exploration, representing the rugged, untamed nature of Earth's southernmost realms.