via NASA

If you want to see cool stuff in the sky, don't plan on sleeping much Monday night. That's when the first total lunar eclipse in over two years will occur. National Geographic points out that the event is "all the more rare because it will be visible above the entire Western Hemisphere." Though they also note this will begin two years of such eclipses—one every sixth months (following this one is another on October 8th). Four lunar eclipses perfectly spaced out over the next two years is probably just science, not an omen or anything.

The eclipse will turn the full moon red, which some call a "blood moon," and NatGeo explains why:

"During an eclipse, sunlight shining through the ring of Earth's dusty atmosphere is bent, or refracted, toward the red part of the spectrum and cast onto the moon's surface. As a result, expect to see the lunar disk go from a dark gray color during the partial phase of the eclipse to a reddish-orange color during totality. The same effect is at work when the sun turns red at sunset.

The moon's color during totality can vary considerably depending on the amount of dust in the Earth's atmosphere at the time. Active volcanoes spewing tons of ash into the upper atmosphere, for instance, can trigger blood-red eclipses. No one can predict exactly what color we'll see before each eclipse."

The whole thing will start around 2 a.m. on the morning of April 15th, and last a little over three hours. has some tips on observing the eclipse.