Science
Circumpolar Stars: The Stars That Never Set
Discover circumpolar stars, the celestial objects that never dip below the horizon from a given latitude. Learn why they circle the celestial poles.
What is it?
Circumpolar stars are stars that, when viewed from a specific latitude on Earth, never set below the horizon. Due to their proximity to a celestial pole, they remain visible throughout the night on every night of the year, appearing to circle the pole. The most famous example in the Northern Hemisphere is Polaris, the North Star, which sits very close to the north celestial pole. Which stars are circumpolar depends entirely on the observer's location; the closer you are to the Earth's poles, the more stars will appear circumpolar.
Why is it trending?
Interest in circumpolar stars is rising with the growing popularity of amateur astronomy and astrophotography. Captivating time-lapse videos and images of star trails, which beautifully illustrate the circular motion of these stars around the pole, are frequently shared on social media platforms. Furthermore, accessible stargazing apps now make it simple for anyone to locate these stars and constellations, like Ursa Major and Cassiopeia in the Northern Hemisphere, fueling curiosity about the night sky's constant features.
How does it affect people?
Historically, circumpolar stars were essential tools for navigation. Sailors and travelers relied on them, particularly Polaris, to determine direction and latitude, providing a constant anchor in the vast sky. Today, they continue to fascinate us, serving as a powerful educational tool to demonstrate Earth's rotation. For hobbyists and stargazers, they are a reliable and awe-inspiring sight, connecting us to the clockwork-like movements of the cosmos and offering a sense of permanence in an ever-changing world.