This weekend, the moon will move into a combination of phases that haven’t been seen together since 1982 and won’t be seen again until 2033, according to culture website The Inertia, among many others.

In fact, this type of moon has occurred only five times since 1900.

So what’s so special about it? The moon we’ll see on Sunday, Sept. 27, is a Super Blood Moon, or a Bloody Super Moon, or something like that…

The extremely rare confluence of phases include:

The full moon: In which the moon is fully illuminated by the sun, and therefore looks entirely circular, as opposed to the fingernail crescent or semicircular half moon phases.

The blood moon: In which the moon passes into the shadow of the Earth, giving it a reddish tint.

The super moon: The moon’s path around the Earth isn’t perfectly circular, more like an oval-type shape. At certain times, that means the moon is closer to the Earth, making it appear as much as 14 percent larger than other times.

If it’s cloudy or otherwise inconvenient to see the Super Blood Moon, you can watch it online through a live feed set up by NASA.

“Sunday’s supermoon eclipse will last 1 hour and 11 minutes, and will be visible to North and South America, Europe, Africa, and parts of West Asia and the eastern Pacific,” the space agency reports. “Weather permitting, you can see the supermoon after nightfall, and the eclipse will cast it into shadow beginning at 8:11 p.m. [eastern time]. The total eclipse starts at 10:11 p.m., peaking at 10:47 p.m.”