None

This is the closest and widest rainbow I have ever encountered. It seems that you can reach the end of the rainbow by going forward. At 1:39 pm on December 13th, I passed through the saddle between the two mountains from the cloud and rain area. The sun suddenly appeared, and I immediately looked back and saw that the very low and very close rainbow was in front of me! At that time, the altitude of the sun was about 35 degrees, and the center of the rainbow was about 35 degrees below the horizon, so the altitude of the rainbow on the horizon was only about 7 degrees!