Most of the Antarctic continent is within the the Antarctic Circle which is at 66 degrees 32 minutes S latitude. All lines of longitude pass through Antarctica. The South Pole is at 90 degrees S latitude. Should it become necessary to provide a longitude, it usually given as 0 degees W longitude.
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The South Pole lies at 90 degrees South Latitude. Vostok Research Station is located at 78°27′51.92″S 106°50′14.38″E, about 1,300 km from the Geographic South Pole.
The 'centre of Antarctica' lies somewhere in between these two named areas, but has not specifically been identified, since the size of the Antarctic continent changes based on the seasonal formation and melting of sea ice around the continent.
The Antarctic continent sits like a "cap" over the south pole.
-- Every latitude south of about 60°S crosses some part of Antarctica,
and every latitude south of about 85.5°S is completely on it.
-- Since all longitudes converge (come together) at the south pole,
every longitude traverses part of Antarctica.
The Antarctic Circle is located at approximately 66.5° South latitude. The South Pole is located at 90° South latitude, and all lines of longitude converge at this point.
The key lines are latitude and longitude. These are based on specific points. The equator is the latitude around the center of the earth. Longitude is measured from the Prime Meridian, which goes through the Greenwich Observatory in England.The Tropics and the Arctic/Antarctic Circle are also key.
Each 'meridian' is a line of constant longitude.
Lines of latitude and longitude allows any position on the Earth to be plotted.
longitude
Lines of latitude are called parallels which run east-west as circles parallel to the equator. There are 5 named lines of latitude called the Arctic Circle, Tropic of Cancer, Equator, Tropic of Capricorn, and Antarctic Circle from North to South, respectively.On the other hand, lines of longitude are called meridians.