Panoramic view of the Bernina Range with blood moon, Eastern Alps, Engadin, Switzerland

Get ready for the blood moon. Lunar eclipse

If you’re lucky enough to find yourself under a cloudless sky tonight, you'll be able to see one of our solar system’s great wonders, a full lunar eclipse, also known as a ‘blood moon.’ The spooky nickname derives from the reddish hue the moon takes on when Earth casts its shadow upon it. Featured here is a blood moon over the Swiss Alps. A full lunar eclipse occurs when the Earth and moon align perfectly with the sun, and the moon falls directly behind Earth’s shadow. When Earth falls behind the Moon’s shadow, a solar eclipse occurs.

While total eclipses of the sun get more attention and make a more dramatic entrance, total lunar eclipses are majestic in their own right and are much more user-friendly. For one, you can look directly at a total lunar eclipse without any worry of harming your eyes. And they're viewable by far more people than solar eclipses. That’s because a total lunar eclipse can last for hours, while solar eclipses last just a few minutes. In addition, lunar eclipses are viewable anywhere on the nighttime side of the world while total solar eclipses occur only within a narrow longitude on the planet.

Tonight’s lunar eclipse coincides with the Flower Moon, the full moon of every May. It will begin just after midnight Eastern time, at 12:12 AM, lasting for 85 minutes. It can be seen from Europe, Africa, and parts of Asia, but is best viewed from North and South America. While not exactly rare, total lunar eclipses don’t occur too often, and even when they do, they can be hidden by cloud cover. If you miss tonight’s blood moon, you’ll get a second chance this year in November. Your next chance after that will be in three years, so you might want to plan to stay up late tonight.