antarctic circle definition geography
Region in a glacier where there is a surface net removal of snow and/or ice by melting, sublimation, and/or calving. Abrasion. Physical wearing and grinding of a surface through friction and impact by material carried in air, water, or ice. On both equinoxes (which means equal nights in Latin), the sun is directly over the equator at noon. Tropic of Capricorn: Experiences 12 hours of daylight and 12 hours of darkness. The sun is 23.5 degrees off of the zenith. Antarctic Circle: Experiences 12 hours of daylight and 12 hours of darkness. South Pole: The sun rises at the South Pole after the Pole having been dark for the past six months (since the March Equinox). The sun rises to the horizon and it remains light at the South Pole for six months. Arctic Circle: It is light 24 hours a day north of the Arctic Circle (66.5 degrees north) on the June Solstice. The sun at noon is 43 off zenith. Tropic of Cancer: On the June Solstice the sun is directly overhead the Tropic of Cancer (23.5 degrees north latitude) at noon. (2) Interception of electromagnetic radiation or sound. Absorption (Atmospheric) Atmospheric absorption is defined as a process in which solar radiation is retained by a substance and converted into heat energy. The creation of heat energy also causes the substance to emit its own radiation. The equivalent line of latitude in the northern hemisphere is the Arctic Circle. The Antarctic Circle is the northernmost latitude in the Southern Hemisphere at which the sun can remain continuously above or below the horizon for 24 hours. The Antarctic Circle is one of the five major circles (or parallels) of latitude that mark maps of the Earth. As of 21 October 2015, it runs 66°33′45.9″ south of the Equator. Due to gradual changes in the tilt of the Earth's axis, the Antarctic Circle is slowly moving. It is currently moving southward at a rate of approximately 15 metres (49 ft) per year. See circles of latitude for further details. All areas south of the Antarctic Circle are dark on the June Solstice. South Pole: By June 21, it has been dark for three months at the South Pole (90 degrees south latitude. The sun set at the South Pole on The September Equinox. September Equinox (approximately September 22-23). This day begins fall in the Northern Hemisphere and spring in the Southern Hemisphere. There are twelve hours of daylight and twelve hours of darkness at all points on the earth’s surface on the two equinoxes. A process in which heat does not enter or leave a system. In the atmospheric sciences, adiabatic processes are often used to model internal energy changes in rising and descending parcels of air in the atmosphere. When a parcel of air rises it expands because of a reduction in pressure.
Northernmost latitude in the Southern Hemisphere at which the sun can remain continuously above or below the horizon for 24 hours.