A “blood moon” happens when Earth’s moon is in a total lunar eclipse. While it has no special astronomical significance, the view in the sky is striking as the usually whiteish moon becomes red or ruddy-brown. The last blood moon on Jan. 20-21, 2019 coincided with a supermoon and the Full Wolf Moon, earning it the title “Super Blood Wolf Moon.”

The next blood moon will happen during the total lunar eclipse of May 26, 2021, which will be visible from parts of North America, Australia, the Pacific and Asia. As the full moon passes through Earth’s shadow, viewers will be treated to a celestial sight that won’t appear again until May of 2022.

When is the next blood moon?