The Arctic Circle is at 66 degrees 32 minutes N latitude. Everything north of the Arctic circle is considered to be the Arctic.
high latitudes
The great circle at 0 degrees latitude is known as the Equator. It is an imaginary line that divides the Earth into the Northern Hemisphere and the Southern Hemisphere.
Well one line of latitude is called the 'equator'.
The Arctic Circle
The line of latitude at 66 degrees 30 minutes south is known as the Antarctic Circle. This line marks the southernmost point at which the sun can be seen at its highest point in the sky during the December solstice. On this line, there will be one day per year where the sun does not set (during the summer solstice) and one day where it does not rise (during the winter solstice).
The Arctic Circle is one of the five major circles of latitude that mark maps of the Earth. The position of the Arctic Circle is not fixed; as of 28 May 2017, it runs 66°33′46.7″ north of the Equator.The region north of this circle is known as the Arctic.
The parallel 66.5 degrees north of the equator is known as the Arctic Circle. It marks the southernmost latitude where the sun can remain continuously above the horizon for a full 24 hours during the summer solstice. This circle is a significant geographic boundary that influences the climate and daylight patterns in the Arctic region.
The region north of the Arctic Circle is known as the Arctic.
At 66 degrees north latitude, you are entering the Arctic Circle. This is the farthest point north where the sun can remain continuously above the horizon for 24 hours during the summer solstice and below the horizon for 24 hours during the winter solstice. This region is known for its extreme cold temperatures, polar day and night phenomena, and unique wildlife.
You have answered the question for yourself ; They are 'Latitudes''. Longitudes (Meridians) are lines that run North to South from the North Pole to the South Pole. Longitudes come to a point at the poles, but spread out to a maximum at the Equator.
The Arctic Circle is a line of latitude roughly 66 and 1/2 degrees north of the Equator. The North Pole is the center of that circle.