Where is Polaris?

The Big Dipper is a part of Ursa major. Graphically, the Big Dipper is located at the back and tail of Ursa Major. Of these seven stars, six are secondary stars and one is tertiary. Through the connection of the two stars in the mouth of the bucket, it extends about 5 times in the direction of the mouth of the bucket and finds the Polaris. "Star Recognition Song" has: "Star recognition begins with Beidou, and then begins from north to west." Beginners can look for other constellations in turn from the Big Dipper. Because the earth's axis of rotation will swing periodically for about 2600 years, the North Star in the Arctic.

The stars are not fixed (always alpha Ursa minor). About 4800 years ago, Polaris was the alpha star of Draco. Until the year 2000, the angle between Alpha Ursa minor and the North Pole will become the smallest (only 28'38 "). In 4000 years, Cepheus Gamma will become the North Star. Around 14000 BC, Alpha Lyra (Vega) became the North Star. Polaris is a very important indicator of field activities and ancient navigation direction. From stargazing to astrophotography, the accurate positioning of the Equatorial Observatory in the observation room is also a very important constellation to identify the direction. Polaris (Gouchenyi) is also a three-in-one system. The distant companion star (Polaris B) can be clearly observed with a small telescope. The nearby companion star (Polaris) is too close to Polaris (the apparent distance is only 0.2 ",but the actual distance is 18.5), so it is too dark to see. It was not until early August 2005 that Hubble captured its image. Polaris is now very close to the north pole of the earth in the sky. Therefore, it always seems to be in the northern sky. It is because of its important position that it is famous. In fact, according to the brightness, it is just an ordinary second-class star, belonging to the "younger generation." It is more than 300 light years away from us. Polaris belongs to the brightest star in Ursa minor, also known as Alpha in Ursa minor. On the constellation diagram, it is on the tip of the bear's tail.