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Name: John R.
Status: Other
Age: 30s
Location: N/A
Country: N/A
Date: July 24, 2003


Question:
What is the exact north latitude of the arctic circle? I am under the belief that it moves because of the earth's wobble. Is this true, and if so, how much does it move?



Replies:
John,

The Arctic Circle is fixed at 66 degrees 34 minutes latitude, defined as the latitude at which the Sun does not set on the Winter and Spring solstice dates of approximately June 21 and December 22. If the tilt of the Earth were different, the latitude definition of the Arctic Circle would indeed be different, as you imply. The exact latitude for a different tilt would be completely dependent on, and proportional to, the tilt angle.

David R. Cook
Atmospheric Research Section
Environmental Research Division
Argonne National Laboratory



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