What is the purpose of the Arctic Circle?

The Arctic Circle is an actual line. It marks the southernmost latitude at which the sun does not rise at least one day a year, and does not set at least one day a year. This makes for long days in summer and long nights during winter.

The Arctic Circle is an imaginary line. It marks the northernmost latitude at which the sun does not rise at least one day a year, and does not set at least one day a year. This makes for long days in summer and long nights during winter.

The Arctic Circle is an actual line. It marks the northernmost latitude at which the sun does not rise at least one day a year, and does not set at least one day a year. This makes for long days in summer and long nights during winter.