Why are there constellations in the sky?

In a typical constellation diagram, the constellation indicated by the arrow is Cassiopeia.

In order to identify the stars easily, people divided several regions according to their natural distribution in the sky. Different sizes. Each region is called a constellation. Connect the bright stars in the same constellation with lines to form various figures. In shape, they are similar to animals and utensils. There are nearly 6,000 stars visible to the naked eye, each of which can be classified as a unique constellation. Each constellation can be identified by the shape of the bright star inside. Basically, dividing stars into constellations is a random process. Different civilizations have different constellations made up of different stars-although some constellations made up of more conspicuous stars are roughly the same in different civilizations, such as Orion and Scorpio. The International Astronomical Union divides the sky into 88 official constellations with precise boundaries, so that every star in the sky belongs to a specific constellation. Most of these official constellations are based on the ancient Greek traditional constellations handed down from the Middle Ages. Constellations play an important role in astronomy; Astrology also uses the image of the zodiac, but it does not use real scientific methods. Astrology is generally regarded as pseudoscience. CONSTELLATION is English "Constellation", which means "Constellation" and "Constellation"; The constellation in astrology is "constellation", which means "sign", "sign" and "symbol". There is such a translation in the English-Chinese dictionary: "Zodiac" is the same free translation as the English-Chinese astronomical vocabulary; In Ying Ying's dictionary, it is explained in more detail: "one twentieth of the zodiac", which means "twelve ecliptic divisions". Therefore, the twelve constellations in astronomical calendar and astrology are different in practical sense. If you are not an astrologer, you should compare your date of birth with the actual dates of the twelve constellations in the astronomical calendar to see which constellation you belong to.