The authenticity of ancient legends has always been controversial because they are usually based on misunderstandings of historical events or cultures, myths, legends, or misunderstandings, or the interpretation of fictional stories. Therefore, ancient legends might not be true historical facts. Some ancient legends may be related to historical facts. For example, stories about the sun, moon, stars and weather in ancient myths may reflect religious beliefs or natural phenomena at that time. However, there were also many ancient legends that were fictional or changed based on later deductions or explanations. Therefore, to determine the authenticity of ancient legends, in-depth research and discussion were needed to understand their origin and background, and to consider their relationship with historical facts.