Compass _ What is the compass?

Is the Big Dipper Ursa major or Ursa minor?

The Big Dipper is Ursa major.

Ursa major is a constellation, which can be seen in most parts of the northern hemisphere all year round. This constellation has the most prominent astrology in the whole day, namely the Big Dipper. Many ancient civilizations thought that the constellation was a bear (but ancient China thought it was a barrel, and ancient Egypt called it the left foot of a cow). This constellation belongs to seven messier objects in the sky, with many binary stars and variable stars.

When you look at the constellation Ursa major, the shape of the spoon is easier to see than the image of the bear. The spoon is in the sky all year round, and the direction of the spoon handle will change in different seasons, just indicating one direction. There was no calendar in ancient times, so people used this method to calculate the four seasons. Because of the rotation of the earth, you need to see this phenomenon at 8 pm.

Extended data:

Deep space objects—

There are several bright galaxies in Ursa major, including M8 1 (one of the brightest galaxies in the sky), M82, windmill galaxy (M 10 1), spiral galaxies M 108 and M 109, and the bright planetary nebula owl nebula.

M8 1 is a spiral galaxy, which is 0.80 billion light years away from the earth1/kloc-0. Like most spiral galaxies, its core consists of ancient stars, and its spiral arms are full of young stars and nebulae. M82 and M8 1 are two eclipse galaxies. In the infrared band, M82 is the brightest galaxy in the sky. There is also a type Ia supernova in this galaxy called SN 20 14J.

M97 is a famous owl nebula, which is a planetary nebula about 0/630 light years away from the Earth. Its magnitude is about 10, which was discovered by Pierre Umeka in 178 1 year.

M 10 1 windmill galaxy is a spiral galaxy facing us, 25 million light years away from the earth. It was also discovered by Pierre Shangmei in 178 1 year. There is a vast star-forming area in its spiral arm, which is emitting strong ultraviolet radiation. The average magnitude of M 10 1 is 7.5, which is visible in binoculars and telescopes, but invisible to the naked eye.

Baidu Encyclopedia-Big Dipper

Baidu encyclopedia-Ursa major