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Why astronomers say you shouldn't miss Tuesday's total lunar eclipse


What's something you wake up really early for...

DEAN REGAS: Get up a little early, just kind of kick back and relax.

CHANG: ...Which always feels like a big event...

REGAS: I feel like it's the day before Christmas or something, yeah, for me. I'm very anxious.

CHANG: ...And that you can watch from all over the world?

REGAS: I've had some pretty exotic ones in places like Hawaii and Greece, and then maybe less exotic ones, like parking lots and malls.


Well, if you're astronomer Dean Regas from the Cincinnati Observatory, it's a total lunar eclipse. And if you look up late into the night tonight in North America and parts of Central and South America, you, too, will be able to share in the spectacle.

CHANG: And if you need a refresher on the celestial mechanics behind the phenomenon, a total lunar eclipse happens when the sun, Earth and moon precisely align, and the Earth's shadow slowly creeps across the lunar surface. With the naked eye, you'll be able to spot that transformation starting in the hours before the sun rises on Tuesday, around 4:09 a.m. Eastern time.

REGAS: And after about an hour, it plunges into darkness, where it turns all eerie shades of orange and red.

NADWORNY: That red color is why the total lunar eclipse is sometimes nicknamed a blood moon. And astronomer Laura Trouille of the Adler Planetarium in Chicago says there's a reason for that red color.

LAURA TROUILLE: It's the same thing that makes our sky blue and our sunsets red. The science behind it is just the Earth's atmosphere is scattering sunlight and scattering away the blue light and letting the red light through to light up the moon.

CHANG: Grab a pair of binoculars if you have them, but Trouille says you can also see the whole show with nothing but the naked eye.

TROUILLE: All you have to do is step outside and look up. And it's such a human thing to want to try to understand and be curious and wonder, how does this universe work? What's our place in it?

CHANG: And you won't want to miss it. The next total lunar eclipse won't be until March 14, 2025.

NADWORNY: So the question now is, are you going to set your alarm, or are you going to stay up all night? Trouille has her answer.

TROUILLE: Oh, you should stay up all night partying and celebrating the sky above.

CHANG: Sounds like a plan to me. Transcript provided by NPR, Copyright NPR.

Christopher Intagliata is an editor at All Things Considered, where he writes news and edits interviews with politicians, musicians, restaurant owners, scientists and many of the other voices heard on the air.
Ailsa Chang is an award-winning journalist who hosts All Things Considered along with Ari Shapiro, Audie Cornish, and Mary Louise Kelly. She landed in public radio after practicing law for a few years.
Elissa Nadworny reports on all things college for NPR, following big stories like unprecedented enrollment declines, college affordability, the student debt crisis and workforce training. During the 2020-2021 academic year, she traveled to dozens of campuses to document what it was like to reopen during the coronavirus pandemic. Her work has won several awards including a 2020 Gracie Award for a story about student parents in college, a 2018 James Beard Award for a story about the Chinese-American population in the Mississippi Delta and a 2017 Edward R. Murrow Award for excellence in innovation.