How many constellations are there in the world? What is the difference?

You mean the whole sky. There are 88 constellations in the sky, namely:

Polar constellations in the northern sky: Ursa minor, Ursa major, Cassiopeia, Draco and Cepheus.

Polaris constellation: Scorpio, Andromeda, Leopard, Auriga, Canis Canis, Fox, Cygnus, Leo Minor, Perseus, Shepherd, Pentecost, Backrow, Corona, Tmall, Lyra, Dolphin, Pegasus, Triangle and Sagittarius.

Zodiac: Cancer, Aries, Gemini, Aquarius, Virgo, Leo, Taurus, Pisces, Capricorn, Scorpio, Libra and Sagittarius. Generally, this is what we usually call the twelve constellations. )

Constellations: Sagittarius, Canis, Eagle, Ophiuchus, Ophiuchus, Sextant, Ophiuchus, Unicorn, Orion and Whale.

Southern constellation: Temple of Heaven, picture frame, fly, mountain case, Indian, Tian Yan, flying fish, long ruler, swordfish, clock, cuckoo, southern triangle, compass, dragonfly, telescope, hydra, southern cross, phoenix, peacock, South Pole, etc.