How many constellations are there in the northern and southern hemispheres?

There are no constellations in the northern and southern hemispheres, only celestial spheres.

1928, the international astronomical union officially announced the internationally used 88-constellation scheme. At the same time, it is stipulated that the vernal equinox and equator of 1875 should be taken as the benchmark. According to the different positions of 88 constellations on the celestial sphere and the existence of stars, they are divided into five regions:

That is, the polar constellation in the northern sky (5), the constellation in the Polaris (40 ~ 90, 19), the zodiac constellation (12 near the ecliptic on the celestial sphere), the zodiac constellation (10) and the constellation in the southern sky (-30 ~-90).

The 88 constellations of the whole day are:

Northern Celestial Constellation (5): Ursa minor (closest to the northern celestial pole), Ursa major, Cassiopeia, Draco and Cepheus.

Polaris constellation (19): Scorpio, Andromeda, Lupo, Auriga, Canis major, Foxes, Cygnus minor, Perseus, Shepherd, Pentecost, Backrow, Corona Nordica, Tmall, Lyra, Dolphin, Pegasus, Triangle.

Zodiac (12): Cancer, Aries, Gemini, Aquarius, Virgo, Leo, Taurus, Pisces, Capricorn, Scorpio, Libra and Sagittarius.

Twelve constellations (10): Sagittarius, Canine, Eagle, Ophiuchus, Ophiuchus, Sextant, Ophiuchus, Unicorn, Orion and Whale.

Southern Constellation (***42): Temple of Heaven, Picture Frame, Fly, Mountain Case, India, Tian Yan, Flying Fish, Long Ruler, Swordfish, Clock, Rhododendron, Southern Triangle, Compass, Dragonfly, Telescope, Hydra and Southern Cross (1999).