Why are there twelve constellations in the world?

In western astronomy, the twelve constellations are the constellations through which the eight planets in the solar system orbit. Here, they are divided into 12 celestial regions, and each celestial region has a constellation. (also called the zodiac) The so-called twelve constellations are made by observing the sun's trajectory on the ecliptic, that is, the time that the sun passes on the celestial sphere every month. For example, Pisces 2. 19 to 3.20. It means that during this period, when the sun looks at the earth, it just passes through Pisces, and so on ... But it is worth noting that due to the movement of the stars and the solar system, the division of the twelve constellations is not consistent now, which shows that the sun will not pass through a certain constellation at a fixed time, but will be slightly delayed!

Aries is special, because 3.2 1 is just the beginning of Aries, also called the vernal equinox, so we call Aries the vernal equinox. At first, astronomy originated in the west. At that time, there was no concept of the lunar calendar, so it was formulated according to the solar calendar. But even if it is done according to the landlord's suggestion, it will not work. Why? Because the lunar calendar is calculated according to the phase change of the moon, it has little to do with these!

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