Later than the record of Huainanzi Spiritual Cultivation, there is a record in the Five Elements of Han Dynasty quoted by Jing Fang, a scholar of the Western Han Dynasty: "In April 43 BC, the sun was dark and as big as a projectile." This shows that there are sunspots on the side of the sun, which are inclined and about the size of projectiles.
Sunspots not only exist for a long time, but also have different forms in the process of growth and decline. At first, only circular black spots appeared at the edge of the sun, and then they gradually increased, so that they became two separate large sunspot groups with countless small sunspots in the middle. This phenomenon was also noticed by ancient observers.
"Song history. "Tian Wen Zhi" records: "112 In April, there were sunspots in Japan and China, which were as big as chestnuts at first glance." This record is a portrayal of an extremely large sunspot group.
According to statistics, during the period of 1.600 years from the Han Dynasty to the Ming Dynasty, the shape and number of sunspots recorded in China ancient books were 1.06 times.