The Arctic Circle is a line of latitude that runs around the globe at a latitude of 66°33'46" North. It marks the northernmost point at which the sun can be seen at midnight on the summer solstice and the southernmost point at which the sun cannot be seen at midnight on the winter solstice.

Here are 9 stone-cold facts about the Arctic Circle:

1. The Arctic Circle is located at a latitude of 66°33'46" North.

2. It marks the northernmost point at which the sun can be seen at midnight on the summer solstice.

3. It marks the southernmost point at which the sun cannot be seen at midnight on the winter solstice.

4. The Arctic Circle is located in the northernmost part of the world, and it includes parts of Alaska, Canada, Greenland, Iceland, Norway, Russia, and Sweden.

5. The Arctic Circle is home to a variety of wildlife, including polar bears, seals, whales, and walruses.

6. The Arctic Circle is also home to a variety of indigenous peoples, including the Inuit, Sámi, and Yupik.

7. The Arctic Circle is experiencing the effects of climate change more than any other part of the world.

8. The Arctic Circle is a popular destination for tourists who want to experience the unique beauty and culture of the region.

9. The Arctic Circle is a region of great scientific and environmental importance, and it is home to a number of research stations.