What is the phenomenon of "seven stars connecting beads" in ancient times?

This is a rare astronomical phenomenon, and there is no science to explain this phenomenon in ancient times, so it is regarded as a good omen.

Step 2 introduce

According to the calculation results, scientists have selected "planetary conjunctions" of more than seven planets in the past 300 years (1850 ── 2150), and classified those with angles less than 13 degrees as "planetary conjunctions". There are 17 kinds of astronomical phenomena.