How many constellations are there?

1930, in order to unify the complicated constellation division, the international astronomical union divided the sky into 88 official constellations with precise boundaries, so that every star in the sky belongs to a specific constellation, including 29 in the north, 2 in the ecliptic 12 and 47 in the south, totaling 88 constellations.

Since ancient times, human beings have associated three or five stars with their mythical figures or artifacts, which are called "constellations". Constellation is a means to determine the orientation of the sky in almost all civilizations and is widely used in the field of navigation. The division of constellations is completely artificial, and different civilizations have different divisions and names. Constellations have no uniform and precise boundaries. Until 1930, in order to unify the complicated constellation division, the International Astronomical Union divided the sky into 88 official constellations with precise boundaries, so that every star in the sky belonged to a specific constellation.

Extended data:

If the vast universe is regarded as a celestial sphere, then the 88 constellations in the universe divide the whole celestial sphere into two parts: the northern celestial sphere and the southern celestial sphere. According to the fact that most of each constellation is in the northern sky or the southern sky, it is called Polaris or South Star respectively. According to this classification, Polaris has 29 constellations, South Star has 47 constellations, and the ecliptic has 12 constellations.