![](http://www.ecns.cn/hd/2021/12/03/a90980c183d2467db44ec745c2e73c74.jpg)
A Moon-Mars occultation is seen at dawn in Beijing, capital of China, Dec. 3, 2021. (Photo/IC)
Occultations happen when the moon and other planets cross paths.
![](http://www.ecns.cn/hd/2021/12/03/531718ca4f294c9a879a173cd9e21bb1.jpg)
A Moon-Mars occultation is seen at dawn in Beijing, capital of China, Dec. 3, 2021. (Photo/IC)
![](http://www.ecns.cn/hd/2021/12/03/bdf186dccf0242d3864da41a74bd0a80.jpg)
A Moon-Mars occultation is seen at dawn in Beijing, capital of China, Dec. 3, 2021. (Photo/IC)