Why do constellations have fire, water, earth and wind phases, but lack metallography?

Constellations are western things, which were introduced to China by the west. In their country, there are only four periods, just like those you mentioned above, each period contains three constellations. It is different from China's theory that the yin and yang poles and the five elements are combined with gold, wood, water, fire and earth. Not only does he have no metallography, but he also has no metallography. And let's China, there is no wind. Constellation and five elements are two completely different divination, which cannot be confused.