'Blood moon' lunar eclipse lights up Americas Thursday night

Earth's atmosphere filters light like a lens, turning the moon red.
The reddish-orange color of a lunar eclipse results from how sunlight bends through Earth's atmosphere.
Mark

Why does the moon turn red during a lunar eclipse? It seems like it should just go black.

Mimi

You'd think so, but Earth's atmosphere is doing something clever. Sunlight bends as it passes through our air, and that bent light reaches the moon. The atmosphere filters out the blue wavelengths and lets the red ones through—like a filter on a camera.

Mark

So it's Earth's shadow, but not a complete shadow.

Mimi

Exactly. It's Earth's shadow, but the shadow has color because of what's happening to the light passing through our atmosphere. That's why it's called a blood moon.

Mark

And this happens two weeks after a solar eclipse. Is that always the case?

Mimi

Not always, but it's common. It's because of how the sun, moon, and Earth line up. The geometry works out so that if you get a solar eclipse during a new moon, you'll often get a lunar eclipse about two weeks later when the moon is full.

Mark

So these aren't rare events.

Mimi

Not at all. They happen regularly. What's rare is being in the right place to see them. This one is well-positioned for the Americas.

  • A near-total lunar eclipse will darken 96.2% of the moon Thursday night, making it one of the most dramatic celestial events visible to the naked eye across the Americas.
  • The blood-red coloring that gives these events their name is not danger but beauty — Earth's own atmosphere painting the moon in the warm tones of every sunrise and sunset at once.
  • The eclipse unfolds in stages across nearly six hours, from first shadow contact at 9:23 p.m. ET to full release at 3:01 a.m., giving viewers time to watch the moon slowly consumed and then reclaimed.
  • Most of North and South America will see the full sequence, though Alaska and far northern Canada will lose the moon to the horizon before the finale — geography shaping who gets the complete story.
  • This eclipse is the second half of a celestial pair, arriving two weeks after a solar eclipse crossed Europe, a rhythm written into the geometry of our solar system and repeating throughout the year.

Two weeks after a solar eclipse darkened skies over southern Europe, the heavens offer a companion spectacle: a near-total lunar eclipse will bathe the moon in reddish-orange light across the Americas Thursday night. At its peak just after midnight Eastern Time, Earth will stand precisely between sun and moon, its shadow swallowing more than 96 percent of the lunar surface. The so-called blood moon is not an omen but an optical truth — sunlight filtered through our own atmosphere, cast gently onto a world we have watched since before we had words for wonder. That the sun and moon appear identical in size from Earth, a coincidence of distance and dimension, is what makes such paired eclipses possible at all.

Two weeks after the sun disappeared behind the moon over southern Europe, the moon itself will vanish into Earth's shadow Thursday night. For skywatchers across North and South America, a near-total lunar eclipse will unfold over several hours, with nearly 96 percent of the lunar surface consumed by darkness at its peak just after midnight.

The visual centerpiece is color. As Earth positions itself between sun and moon, its atmosphere bends and scatters sunlight onto the lunar surface, tinting it a reddish-orange — the origin of the term 'blood moon.' The effect is entirely natural, the same physics that colors every dawn and dusk, now projected onto another world.

The eclipse begins at 9:23 p.m. Eastern Time, when the moon grazes Earth's outer shadow. The more dramatic phase arrives at 10:33 p.m., when the darker inner shadow begins visibly consuming the disk. Maximum eclipse occurs at 12:12 a.m. Friday, and the moon emerges fully by 3:01 a.m. No protective equipment is needed — unlike solar eclipses, lunar eclipses are safe to watch with bare eyes, though binoculars will reward the curious.

Most of the Americas will witness the full sequence. Alaska and the far north of Canada will lose the moon to the horizon before it concludes, while early risers in Europe and Africa may catch the opening act before their own moonset.

The pairing of these two eclipses is no coincidence — it reflects one of nature's more improbable symmetries. The sun is roughly 400 times farther from Earth than the moon, and also roughly 400 times larger, making the two appear nearly identical in size from our vantage point. Solar eclipses occur at new moon; lunar eclipses follow approximately two weeks later at full moon, when the geometry aligns again in reverse. This rhythm repeats throughout the year, a quiet clockwork written into the architecture of our solar system.

Two weeks after the sun vanished behind the moon over southern Europe, the moon itself will disappear into Earth's shadow Thursday night. For skywatchers across North and South America, a near-total lunar eclipse will unfold over several hours, with nearly 96 percent of the lunar surface swallowed by darkness at its peak.

The mechanics are straightforward: Earth will position itself directly between the sun and the moon, casting its shadow across the lunar disk. What makes this eclipse visually striking is the color. As Earth's atmosphere bends and scatters sunlight, that light reaches the moon's surface with a reddish-orange tint—the phenomenon that has earned lunar eclipses the name "blood moon." The effect is entirely natural, a consequence of how our atmosphere filters light the way a lens does.

The show begins Thursday at 9:23 p.m. Eastern Time, when the moon first touches the outer edge of Earth's shadow. The more dramatic phase starts at 10:33 p.m., when Earth's darker inner shadow begins to visibly consume the moon, creating the appearance of something taking a bite from the lunar disk. The eclipse reaches its maximum at 12:12 a.m. Friday morning, when more than 96 percent of the moon lies within Earth's shadow. By 3:01 a.m., the moon will have slipped free entirely.

Most of North and South America will witness the entire sequence, with the exception of Alaska and the northernmost parts of Canada, where the moon will set before the eclipse concludes. Viewers in Europe and Africa will catch the beginning of the event early Friday morning, though the moon will set before the eclipse finishes. Unlike solar eclipses, which require special protective equipment to view safely, lunar eclipses pose no danger to the naked eye. Binoculars and telescopes will reveal additional detail for those who want a closer look.

The pairing of these two eclipses—solar and lunar, separated by roughly two weeks—is no accident. It reflects a remarkable cosmic coincidence: the sun is approximately 400 times farther from Earth than the moon, and it is also roughly 400 times larger. This means the two bodies appear nearly identical in size when viewed from our planet. Solar eclipses occur when the moon passes in front of the sun during the new moon phase. Roughly two weeks later, when the moon has traveled to the opposite side of Earth and is full, the geometry aligns again—this time with Earth casting its shadow on the moon. This pairing happens repeatedly throughout the year, though not every eclipse is visible from every location on Earth.

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