A solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Purbu Zhaxi)

A solar eclipse is seen in Guiyang City, southwest China's Guizhou Province, June 21, 2020. (Xinhua/Liu Xu)

A partial solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Zhan Yan)

A partial solar eclipse is seen in Beijing, capital of China, June 21, 2020. (Xinhua/Xing Guangli)

A partial solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Sun Fei)

A solar eclipse is seen in Beijing, capital of China, June 21, 2020. (Photo by Zhang Yanhui/Xinhua)

Photographers take photos of the solar eclipse in Butuo County, southwest China's Sichuan Province, June 21, 2020. (Xinhua/Jiang Hongjing)

A partial solar eclipse is seen in Fuzhou, capital of southeast China's Fujian Province, June 21, 2020. (Xinhua/Wei Peiquan)

A partial solar eclipse is seen in Fuzhou, capital of southeast China's Fujian Province, June 21, 2020. (Xinhua/Wei Peiquan)

A solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Zhan Yan)

A partial solar eclipse is seen in Beijing, capital of China, June 21, 2020. (Xinhua/Li Xin)

An airplane flies over the sky as a solar eclipse occurs in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Purbu Zhaxi)

A partial solar eclipse is seen in Xide County in Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province, June 21, 2020. (Xinhua/Wang Xi)

A partial solar eclipse is seen in Nanchang City, east China's Jiangxi Province, June 21, 2020. (Xinhua/Wan Xiang)

An airplane flies over the sky as a solar eclipse occurs in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Purbu Zhaxi)

The multiple exposure photo taken on June 21, 2020 shows images of a partial solar eclipse in Butuo County, southwest China's Sichuan Province, June 21, 2020. (Xinhua/Jiang Hongjing)

The multiple exposure photo taken on June 21, 2020 shows images of a partial solar eclipse in Beijing, capital of China. (Xinhua/Meng Dingbo)

A partial solar eclipse is seen in Jinan, east China's Shandong Province, June 21, 2020. (Xinhua/Zhu Zheng)

A partial solar eclipse is seen in Macao, south China, June 21, 2020. (Xinhua/Cheong Kam Ka)

A partial solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Purbu Zhaxi)

A partial solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Jigme Dorje)

A partial solar eclipse is seen in Beijing, capital of China, June 21, 2020. (Xinhua/Ju Huanzong)

A partial solar eclipse is seen in Beijing, capital of China, June 21, 2020. (Xinhua/Meng Dingbo)

The multiple exposure photo taken on June 21, 2020 shows images of a partial solar eclipse in Butuo County, southwest China's Sichuan Province, June 21, 2020. (Xinhua/Jiang Hongjing)

A partial solar eclipse is seen in Lhasa, southwest China's Tibet Autonomous Region, June 21, 2020. (Xinhua/Tang Tao)

A partial solar eclipse is seen in Butuo County, southwest China's Sichuan Province, June 21, 2020. (Xinhua/Li Mengxin)

The double exposure photo taken on June 21, 2020 shows a partial solar eclipse in Changchun, northeast China's Jilin Province. (Xinhua/Zhang Nan)