The moon is seen during a lunar eclipse in Washington, the United States, on Jan. 20, 2019. (Xinhua/Liu Jie)

The moon is seen during a lunar eclipse in Washington, the United States, on Jan. 21, 2019. (Xinhua/Liu Jie)

The moon is seen during a lunar eclipse in Washington, the United States, on Jan. 20, 2019. (Xinhua/Liu Jie)

This combo photo shows the process of total lunar eclipse in Madrid, Spain, Jan. 21, 2019. (Xinhua/Guo Qiuda)

The moon is seen during a total lunar eclipse in Madrid, Spain, Jan. 21, 2019. (Xinhua/Guo Qiuda)

Photo taken on Jan. 21, 2019 shows a full moon in Bhaktapur, Nepal. (Xinhua/Sunil Sharma)

The moon is seen during a total lunar eclipse, in Brussels, Belgium Jan. 21, 2019. (Xinhua/Ye Pingfan)

Photo taken on Jan. 20, 2019 shows the moon during a total lunar eclipse in New York, the United States. (Xinhua/Li Rui)

The moon is seen during a total lunar eclipse, in Brussels, Belgium Jan. 21, 2019. (Xinhua/Ye Pingfan)

Photo taken on Jan. 20, 2019 shows the moon during a total lunar eclipse in New York, the United States. (Xinhua/Li Rui)