Stargazers, mark your calendars! A total lunar eclipse, or “blood moon,” will occur on Sept. 7-8, when Earth’s shadow fully covers the moon, giving it a deep red hue.

This rare alignment happens about three times a year, with the crimson glow caused by Earth’s atmosphere scattering sunlight.

Observers can prepare viewing spots or capture photos of the event, while those who miss it can watch a livestream hosted by Space.com.