This will coincide with the largest supermoon of the year, and also the first total lunar eclipse since January 2019. Although precise definitions vary, a supermoon is said to occur when the full moon takes place near the closest point in its orbit to the Earth. Total lunar eclipses can take place only when the moon is full as they require the Earth to be directly in between the Sun and the moon. The total “red” phase will only be visible from the west coasts of the Americas, the east coasts of Asia, and the Pacific territories in between. The eclipse is not visible from Africa and Europe, although the full supermoon will be easily seen.

Source: The Guardian May 24, 2021 05:01 UTC