When we talk about the constellations in the sky, we can analyze different types. One of the lesser-known but very important types is the circumpolar constellations. These are constellations that many people are unaware of, but they are of great significance. They are located within 30 degrees of the square of the geographic North Pole or the geographic South Pole. One of the best-known stars in this constellation is Polaris, the North Star, which belongs to Ursa Minor.
In this article we are going to explain everything you need to know about the circumpolar constellations and their importance.
Characteristics of the stars and constellations
When we say we are analyzing constellations, we are referring to a group of stars that are arbitrarily connected and share a special characteristic: they are positioned along imaginary lines and paths that can form a figure, silhouette, or shape resembling objects, people, or an abstract design. There are numerous types of constellations, depending on their shape and the number of stars they contain. Some constellations have more than 200 stars, although they typically have fewer.
Some constellations are easy to recognize in the sky thanks to the brightest stars that belong to the same constellation, known as alpha stars. Stars in one constellation can also be part of others and are divided into different types. Most constellations are classified according to their position in the sky. These include northern constellations, southern constellations, zodiacal constellations, and circumpolar constellations.
The constellations of the zodiac are very well-known because they also hold great significance in relation to the zodiac signs and important mythological stories. Circumpolar constellations are those located at a distance of at least 30 square degrees from the geographic North or South Pole. They are the closest to the poles. One of the most famous stars belonging to these constellations is Polaris, the North Star, which can be seen in North Star.
Circumpolar constellations of the northern hemisphere
Source: astronomiaparatodos.com
Let's analyze the 8 circumpolar constellations belonging to the Arctic Circle, which are located at the North Pole and the northernmost areas.
- Great Bear: It is the constellation also known as Ursa Major, due to its Latin name. It is the most famous in the entire firmament. It can be seen throughout the year in the northern hemisphere and consists of about 209 stars, 18 of which are major. Great Bear It is a fascinating constellation that offers much more than just its shape.
- Little Bear: This is another of the world's best-known constellations and one of the most representative of the Northern Hemisphere. It has only seven stars that form the silhouette of a wheelbarrow or cart, which is why it is also called the constellation of the chariot. It is located in the Northern Hemisphere and houses the North Star, which helps to constantly point to the geographic North Pole and is impossible to observe from the Southern Hemisphere.
- Cassiopeia: This is one of the constellations included in Ptolemy's main catalog. It is a constellation formed by five main stars in the shape of an M or W, with their ends pointing toward the northern pole star. This constellation belongs to the group of 5 modern astronomical constellations, and you can learn more about it at This article about Cassiopeia. It is found in the northern circumpolar sky.
- North Pole Star: It is the luminous star that was close to the geographic North Pole. Currently, we see that this position is covered by the star Polaris, also known as Alpha Ursa Minoris. It belongs to the constellation Ursa Minor and is the brightest of them all. Its importance lies in the fact that it guides navigators.
Circumpolar constellations of the southern hemisphere
In the southern hemisphere, the circumpolar constellations are also called meridian constellations, and there are only six constellations that manage to figure prominently in the hemisphere. Let's analyze each of them:
- Crux: It is known as the Southern Cross constellation, and is one of the most famous constellations of the south pole. It is used to locate the south celestial pole, extending to the brightest star. The brightest star in this constellation is called Acrux. This constellation is composed of four main stars and is the smallest of all the constellations in the sky today.
- carina: It is one of the best known constellations for previously forming a large constellation of the Nave Argos. It was divided into 4 other small constellations known by the names of Vela, Puppis, Pyxis and Carina. This constellation has the second brightest star in the entire sky. It is known by the name of Alpha Carinae. Within this constellation is the star Canopo. This name comes from the navigator of Menelaus, the king of Sparta.
- South Pole Star: It is currently known by the name of the Great Meridian Star. This means it is located in the southern hemisphere, specifically in the area closest to the geographic South Pole. Although this star is not very visible, it should be viewed within the constellation of the Southern Cross. It has an important star known as Polaris Australis.
Some curiosities
Circumpolar constellations have some interesting features, such as the fact that we can always see them. They can be observed at any time of day, if it weren't for the sun. Furthermore, they can be viewed at any time of year. They are so named because they are found in the hemispheres near the poles and revolve around the North Star.
Due to Earth's rotation, we perceive the sky as rotating around the celestial poles. This makes it seem as though the stars complete a full rotation every 24 hours. This rotation also includes Polaris, the North Star, even though it's not located exactly at the celestial north pole. However, it traces a circle around the pole that is practically imperceptible.
Depending on the latitude where we are now, some stars will write an arc in the sky, while others will describe a circle around the celestial pole; these are the circumpolar constellations.
I hope that with this information you can learn more about the circumpolar constellations.