Pole star - Wikipedia
A pole star is a visible star that is approximately aligned with the axis of rotation of an astronomical body; that is, a star whose apparent position is close to one of the celestial poles. On Earth, a pole star would lie directly overhead when viewed from the North or the South Pole.
Polaris - Wikipedia
Polaris is a star in the northern circumpolar constellation of Ursa Minor. It is designated α Ursae Minoris (Latinized to Alpha Ursae Minoris) and is commonly called the North Star or Pole Star.
Polaris | Location, Constellation, & Facts | Britannica
Polaris, Earth’s present northern polestar, or North Star, at the end of the ‘handle’ of the so-called Little Dipper in the constellation Ursa Minor. Polaris is actually a triple star. It is located about 447.6 light-years from Earth and is the closest Cepheid variable.
What is the North Star and How Do You Find It? - NASA Science
2021年7月28日 · Polaris, known as the North Star, sits at the center of this image, which captures the movement of stars around the north celestial pole over several hours. The North Star isn't the brightest star in the sky, but it's usually not hard to spot, even from the city.
(1b) Finding the Pole Star - NASA
2014年3月28日 · Two bright constellations occupy opposite sides of the pole star--the Big Dipper and Cassiopeia. As the celestial sphere rotates (or appears to rotate), these constellations also march in circles around the pole .
The changing pole star - Explaining Science
2020年9月25日 · Many people know that Polaris, the brightest star in the constellation Ursa Minor (The Little Bear), is also known as the pole star. Indeed, the name Polaris itself was invented in the sixteenth century and is derived from the Latin stella polaris -pole star.
What is the North Star? Is the North Star always north? - Star Walk
2023年2月20日 · The North Star, or Polaris, is a very special star that sits almost directly at the Earth’s North celestial pole. It’s the only bright motionless star in the sky. It’s a more consistent navigational tool than a magnetic compass.
Night Sky, Celestial Navigation & Celestial Pole - Britannica
Polestar, the brightest star that appears nearest to either celestial pole at any particular time. Owing to the precession of the equinoxes, the position of each pole describes a small circle in the sky over a period of 25,772 years. Each of a succession of stars has thus passed near enough to …
Polaris (the North Star) | Star Facts - Star Facts – Stars: A guide ...
2024年9月27日 · Polaris, Alpha Ursae Minoris (α UMi), is a yellow supergiant located approximately 446 light-years away in the constellation Ursa Minor. It is the current North Star, the closest visible star to the north celestial pole. It marks …
Polaris (α Ursae Minoris) Facts - The Nine Planets
2020年1月20日 · Polaris is the brightest star in the constellation of Ursa Minor. It is a triple star system and currently, it is our North Star or Pole Star. This title is given to stars that are close to the North Pole – something that changes through the passing of years due to Earth’s movement. Key Facts & Summary