For what purpose did the Tang Dynasty stipulate that astronomy should not be studied privately?

1. In fact, in the ancient dynasty, Qin specially set up a calendar to be responsible for astronomy, and it was not allowed to study astronomy privately. This is to stabilize the regime and the rule of the court.

2. The ancient theory of telepathy between man and nature holds that the emperor violates God's will, and if he is unkind and unjust, there will be disasters in the sky to condemn and warn him. If the government is reasonable and the people are peaceful, God will send auspicious signs to encourage them. Coupled with the low level of science and superstition in ancient times, the ancients often thought that the change of astronomical phenomena was directly related to the change of personnel. For example, "it's like being in the air, confusing the moon and crape myrtle, killing the old, too white to die." In ancient times, jinx (meteor) was regarded as unknown, which indicated the rise and fall of the corresponding dynasties and the replacement of the regime dynasties.