Why is no star's birthday counted as the lunar calendar?

Chinese astrology is based on twenty-eight nights (see twenty-eight nights in Sanyuanli) or twelve o'clock and the dividing line, observing the sky and its area, so as to predict the events that will happen in the state and country on the ground corresponding to this area; Divining the fate of the emperor and his family, China's astrology is called Wei Zi's fortune (I'm not very proficient in China's astrology, which may be ambiguous. They are calculated according to the lunar calendar.