The reason for that abnormal blood-red sky in Zhoushan was found.

The reason for Zhoushan's abnormal blood-red sky is the refraction of light. Its light source is a red light on a ship docked at the dock.

It is common for the sea sky to turn red. At that time, an ocean-going ship was parked on the dock, and the red light was the lamp of saury. Red and yellow light have the longest wavelength in visible light, strong penetrating power, and a lot of water vapor suspended in the air, so this "strange phenomenon" appears.

Ancient bloody sky:

In fact, as early as the thirty-fifth year of Qianlong (1770), a large area of blood red appeared in the skies of China, Japan and North Korea. This phenomenon began in September 10 and lasted for nine nights. Among them, Japan is the most prominent phenomenon, and the Japanese people at that time felt very incredible.

Therefore, there are corresponding records all over Japan. For example, the Nagoya Library in Japan has 1770 paintings about the bloody sky.

It was not until 20 17 that the conclusion about this matter was reached. 2011654381On October 29th, many Japanese scientists published papers in famous academic journals, claiming that the bloody sky of 1770 was caused by the aurora caused by a super-large-scale solar activity.