In ancient times, people observed that the period and orientation of the stars in the black dragon were consistent with what period?

In ancient times, people observed that the stars in the black dragon rose in the eastern night sky in spring and set in the west in autumn, and their cycles and orientations coincided with the agricultural cycle in a year.

Spring ploughing began, and the stars in the black dragon began to rise in the eastern night sky, revealing bright bibcock; In summer, crops grow, and the black dragon star hangs in the southern night sky; In autumn, the crops are harvested, and the stars in the black dragon begin to fall in the west; Everything lurks in winter, and the stars in the black dragon are hidden under the northern horizon.