Why are there only twelve constellations?

There are 88 constellations in the whole day * * * more than twelve. What constellation are you? What we usually hear is actually the zodiac. In fact, there are more than 12 constellations on the ecliptic. Ophiuchus and Orion also eat the ecliptic, but not the ecliptic 12 and the ecliptic 12. For the west, the number 12 also has some special significance. Christ has 12 disciples, but for astrology, 12 house corresponds to 12 month, which is more convenient for divination.