Polaris, the North Star

Why it stays put

Polaris sits almost on the point the northern sky turns around, so it hardly moves while the other stars wheel past.

As Earth spins, the stars appear to circle two points in the sky above its poles. NASA explains (opens in a new tab) that Polaris lies close to the northern one, the north celestial pole, so over 24 hours it traces only a very small circle, while stars farther from the pole sweep out larger ones.

By this site's calculation from the Bright Star Catalogue (opens in a new tab), Polaris is 0.63° from the pole in 2026, a little more than the width of the full Moon, and still closing: 0.55° by 2050. That is close enough for NASA to call it (opens in a new tab) a reliable way to tell which way is north at night.

Its height above the northern horizon is close to your latitude. At the North Pole (opens in a new tab) it would be overhead; farther south it sits lower. By this site's calculation (opens in a new tab), from 40°N it stands about 41° up in the north; at the equator it is on the horizon, and from south of the equator it never rises.

Keep in mind Polaris marks true north, the direction of the geographic pole, not magnetic north (opens in a new tab), which is where a compass needle points.

Sources for this section Preston Dyches, What is the North Star and How Do You Find It?, NASA Science (2021, updated 2024) (opens in a new tab) · ; Bright Star Catalogue, 5th Revised Ed. (Hoffleit & Warren 1991), as computed by this site's star engine (opens in a new tab) · ; NASA Science, Skywatching FAQ (2024) (opens in a new tab)

How to find it

Use the Big Dipper: the two stars at the end of its bowl point to Polaris.

NASA's method (opens in a new tab): find the Big Dipper and take the two stars at the outer end of its cup, the pointer stars. The National Park Service (opens in a new tab) gives the old rule of thumb for how far to go: extend a straight line about five times the distance from the outermost star of the bowl.

The line ends at Polaris, the tip of the Little Dipper's handle (opens in a new tab) and the tail of the little bear, Ursa Minor. Polaris belongs to that constellation, not to Ursa Major, the Big Dipper's own.

Once you face Polaris you are facing north, NASA notes (opens in a new tab), which orients you for the rest of the night. The Dipper swings around the pole through the night and through the year, standing on its handle or hanging upside down, but the pointers turn with it and keep leading back to Polaris.

How to see it Polaris is usually not hard to spot, even from the city (opens in a new tab), but it is not dazzling. Look for a moderately bright star standing fairly alone at the end of the pointer line, not for the brightest star in the north.

Keep in mind From mid-northern and higher latitudes Cassiopeia is up every clear night (opens in a new tab), so when the Dipper is low, Cassiopeia's W is another way in.

Sources for this section Preston Dyches, What is the North Star and How Do You Find It?, NASA Science (2021, updated 2024) (opens in a new tab) · ; Julie West, North Star to Freedom, U.S. National Park Service (2018) (opens in a new tab) · ; NASA Hubble, IC 63 Ghost Nebula (opens in a new tab)

Not the brightest star

Polaris is famous for where it is, not for how bright it is.

A common belief is that the North Star outshines the rest. It does not. In ESA's table (opens in a new tab) of the 50 brightest stars measured by the Hipparcos satellite it comes near the bottom, at magnitude 1.97, and Ian Ridpath (opens in a new tab) places it just inside the 50 brightest stars seen by the naked eye.

What it has is position. Ridpath (opens in a new tab) notes that it lies within 1° of the exact north celestial pole, close enough to make it an excellent guide for navigators. The National Park Service (opens in a new tab) tells how the night sky helped people escaping slavery in the United States find their way north.

Keep in mind How bright a star looks mixes how much light it gives out with how far away it is. Brightness, luminosity and distance.

Sources for this section ESA, Hipparcos: The 50 Brightest Stars (opens in a new tab) · ; Ian Ridpath, Star Tales: Ursa Minor (opens in a new tab) · ; Julie West, North Star to Freedom, U.S. National Park Service (2018) (opens in a new tab)

Three stars, and an argument about the distance

The North Star is a triple system, and its distance was argued over for decades.

Polaris is a triple star system (opens in a new tab). In 2006 the Hubble Space Telescope saw its close companion directly for the first time; a second companion is easy to see through a small telescope.

The main star is a Cepheid, a star that swells and shrinks and so rises and falls in brightness, and the nearest Cepheid (opens in a new tab) to us. Cepheids matter because the link between how they pulse and how luminous they are, the period-luminosity relation that the Center for Astrophysics (opens in a new tab) mentions, lets astronomers measure the distances to other galaxies.

Its own distance was hard to pin down. The Center for Astrophysics (opens in a new tab) notes that earlier estimates ran from about 326 to 522 light-years, and that the Gaia satellite's measurement, 445.5 light-years, settles a long-standing uncertainty. A later NASA Night Sky Network article (opens in a new tab) uses about 433 light-years, so published figures still differ.

Sources for this section NASA Science, There's More to the North Star Than Meets the Eye (2006) (opens in a new tab) · ; Center for Astrophysics | Harvard & Smithsonian, Polaris, the North Star (Evans et al. 2018) (opens in a new tab) · ; Kat Troche (Astronomical Society of the Pacific), The Great Rift, NASA Night Sky Network (2025) (opens in a new tab)

Not always the pole star

Earth's axis wobbles, so the pole drifts among the stars and the title of North Star passes from star to star.

Earth's axis wobbles like a spinning top, a motion called precession that takes about 25,771 years (opens in a new tab) to come round; NASA's North Star page (opens in a new tab) rounds it to about 26,000. As it turns, the celestial pole traces a slow circle among the stars.

In Ptolemy's day (opens in a new tab), the second century, no bright star was near the pole: Polaris was some 11° away, and Kochab was closer, but only by a couple of degrees. The Latin name stella polaris first appears in print in an edition of the Alfonsine Tables published in Venice in 1492. NASA notes (opens in a new tab) that a couple of thousand years ago the northern pole stars were Kochab and Pherkad.

About 14,000 years ago (opens in a new tab) the pole lay near Vega, and it will come back to Vega in about 12,000 years.

Sources for this section NASA Science, Milankovitch (Orbital) Cycles and Their Role in Earth's Climate (2020) (opens in a new tab) · ; Preston Dyches, What is the North Star and How Do You Find It?, NASA Science (2021, updated 2024) (opens in a new tab) · ; Ian Ridpath, Star Tales: Ursa Minor (opens in a new tab)

The south has no bright pole star

The southern sky turns around an empty-looking patch; southern observers find south another way.

No bright star (opens in a new tab) marks the south celestial pole. The star nearest it that the IAU has named, Polaris Australis (opens in a new tab) (sigma Octantis), shines at only magnitude 5.45, faint enough that light pollution (opens in a new tab) hides it from many places.

Southern observers (opens in a new tab) use other ways to find due south, including the stars of the Southern Cross. NASA (opens in a new tab) names Polaris and Polaris Australis together as today's pole stars.

Sources for this section Preston Dyches, What is the North Star and How Do You Find It?, NASA Science (2021, updated 2024) (opens in a new tab) · ; IAU Working Group on Star Names, IAU Catalog of Star Names (IAU-CSN) (opens in a new tab) · ; Kat Troche (Astronomical Society of the Pacific), Check Your Sky Quality with Orion!, NASA Night Sky Network (2023) (opens in a new tab) · ; NASA Science, Milankovitch (Orbital) Cycles and Their Role in Earth's Climate (2020) (opens in a new tab)