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- Created 2012-02-18
is either the
, the Arctic Circle is located at a
of N, and the Antarctic Circle is located at a latitude of S.
Areas between each polar circle and its associated pole (
), known geographically as the frigid zones, would theoretically experience at least one 24 hour period when the sun is continuously above the
and at least one 24 hour period when the sun is continuously below the horizon annually. However, due to
and the Sun being an
rather than a
, the continuous daylight area is somewhat extended while the continuous darkness area is somewhat reduced.
The latitude of the polar circles is 90 degrees minus the
of the Earth's axis of daily rotation relative to the
, the plane of the Earth's orbit. This tilt varies slightly, a phenomenon described as
. Therefore the latitudes noted above are calculated by averaging values of tilt observed over many years. The axial tilt also exhibits long-term variations as described in the reference article (a difference of 1 second of arc in the tilt is equivalent to change of approximately 31 metres north or south in the positions of the polar circles on the Earth's surface).
from Wikipedia (last updated: 05 December), licensed under
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''Trópico en movimiento'' (in Spanish)
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