Nepedia
Back to Discover
Advanced Reader
🗺️

Arctic Circle

geography Maturity 7-9 Next article →

The Arctic Circle is a significant geographic boundary on Earth.

Arctic circle
Arctic circle

It marks the southernmost latitude where the Sun behaves in extreme ways. This line is located at approximately 66 degrees and 34 minutes North. It is the northernmost of the five major circles of latitude. It is also one of two polar circles. Its southern counterpart is the Antarctic Circle. The area north of this circle is known as the Arctic. This region covers about 4% of the Earth's total surface.

North polar projection map
North polar projection map

The unique behavior of the Sun is caused by Earth's axial tilt. The axis is the imaginary line Earth rotates on. This tilt determines how much sunlight different parts of the planet receive. At the June solstice, the Sun does not set for locations within the circle. This phenomenon is called the midnight sun. At the December solstice, the Sun does not rise at all. This period of darkness is known as the polar night. The closer a person travels toward the North Pole, the longer these events last. For example, in Murmansk, Russia, the Sun stays below the horizon for 40 days total around the winter solstice.

axial tilt vs tropical and polar circles
axial tilt vs tropical and polar circles

Atmospheric refraction also plays a role in how we see the Sun. Refraction is the way the atmosphere bends light. Because of this, the Sun may appear higher in the sky than its true geometric position. This effect can make the midnight sun visible even slightly south of the Arctic Circle. At sea level, this can happen about 50 minutes of arc south of the line. The same effect can make the Sun visible up to 50 minutes of arc north of the line during winter. These limits change if you are at a higher elevation. In mountainous regions, the view of the true horizon is often blocked.

The position of the Arctic Circle is not permanent. It changes slightly every year due to the Earth's axial tilt. This tilt fluctuates by about 2 degrees over a 41,000-year period. These changes are caused by tidal forces from the Moon's orbit. Currently, the Arctic Circle is drifting toward the North Pole. It moves at a speed of about 15 meters per year. During this same period, the Antarctic Circle is drifting toward the South Pole. The word "arctic" comes from the Greek word "arktikos." This means "near the Bear," referring to the northern bear constellation.

Arctic circle
Arctic circle

Many different countries have land or waters within the Arctic Circle. These eight nations are Canada, Denmark, Finland, Iceland, Norway, Russia, Sweden, and the United States.

Arctic circle
Arctic circle

The circle passes through the Arctic Ocean, Greenland, North America, Asia, and the Scandinavian Peninsula. Some areas have very large populations, while others are sparsely populated. Salekhard, Russia, is unique because it is the only city located directly on the Arctic Circle.

Polar circle monument (08)
Polar circle monument (08)

Other large communities include Murmansk and Norilsk in Russia, and Tromsø in Norway. In the United States, Utqiagvik, Alaska, is the largest settlement north of the line.

The climate in the Arctic is generally very cold. However, the Gulf Stream creates exceptions in certain areas. This ocean current brings warmer water to the coasts of Norway. Because of this, many northern Norwegian and Russian ports remain ice-free all year. In the interior regions, the weather can be much more extreme. Summers can become quite warm in some places. In contrast, winters in places like Norilsk can see temperatures fall below -50 degrees Celsius.

Northern lights at the Arctic Circle
Northern lights at the Arctic Circle

Human activity and international law also shape the Arctic region. The area includes land, internal waters, and exclusive economic zones, or EEZs. An EEZ is a sea zone where a country has special rights over resources. Under the United Nations Convention on the Law of the Sea, the North Pole and high seas are not owned by any nation. Instead, sovereignty is managed through specific maritime zones. The "Arctic Five" nations include Canada, Denmark, Norway, Russia, and the United States. These countries maintain specific rights over their continental shelves. Visitors can find many landmarks throughout the region, such as signs in Auyuittuq National Park.

Arctic Circle Sign - Auyuittuq National Park, Baffin Island, Nunavut, Canada
Arctic Circle Sign - Auyuittuq National Park, Baffin Island, Nunavut, Canada

You might also see the aurora borealis, or northern lights, in the night sky.

Rovaniemi - Aurora Borealis
Rovaniemi - Aurora Borealis
689 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (9)
File:Arctic circle.svg
Arctic circle.svg
File:axial_tilt_vs_tropical_and_polar_circles.svg
axial_tilt_vs_tropical_and_polar_circles.svg
File:World map with arctic circle.svg
World map with arctic circle.svg
File:North polar projection map.svg
North polar projection map.svg
File:Santa Land Rovaniemi Arctic Circle2.jpg
Santa Land Rovaniemi Arctic Circle2.jpg
File:Polar circle monument (08).jpg
Polar circle monument (08).jpg
File:Arctic Circle Sign - Auyuittuq National Park, Baffin Island, Nunavut, Canada.jpg
Arctic Circle Sign - Auyuittuq National...
File:Northern lights at the Arctic Circle.jpg
Northern lights at the Arctic Circle.jpg
File:Rovaniemi - Aurora Borealis.jpg
Rovaniemi - Aurora Borealis.jpg
More to explore

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.