Here's what to expect during each stage of the Aug. 27-28 partial lunar eclipse, as our planet's colossal shadow swallows 96% of the moon's surface for billions on the night side of Earth.
August's lunar eclipse is the closing act of a dramatic two-part show, the opening act of which began on Aug. 12 as the moon covered the face of the sun to trigger a spectacular total solar eclipse over parts of Greenland, Iceland and Spain.
Eclipses always come in pairs, but the stages to be expected during a lunar eclipse are staggeringly different from its solar equivalent. One major bonus of a lunar eclipse is that each stage unfolds simultaneously for everyone on the night side of Earth, where the lunar disk is above the horizon. However, the local time for each stage will differ based on your location.
Lunar eclipses are also completely safe to view with the naked eye, or even through a pair of binoculars of a telescope, which will offer a magnified view of the moon as Earth's shadow sweeps across its cratered landscape.
Earth's shadow is divided into two concentric cones that are only visible during the brief window of a lunar eclipse. The outer penumbral cone casts a soft, wide shadow, while the inner umbra reveals the distinct curve of Earth's silhouette.
The 5 stages of the partial lunar eclipse August 2026
Stage 1: Earth's penumbral shadow sweeps across the moon
The eclipse officially begins at 9:23 p.m. EDT on Aug. 27 (0123GMT on Aug. 28), as Earth's outer penumbral shadow begins to cover the moon's surface, according to TimeandDate.com.
Darkening of the lunar disk during this stage is incredibly subtle, becoming most apparent in the moments before Earth's inner shadow appears to transform August's "Sturgeon Moon", which is named for the time of year when the large fish were easily caught in North America.
Stage 2: Partial lunar eclipse begins
Earth's inner umbral shadow will take its first "bite" out of the moon at 10:33 EDT on Aug. 27 (0233 GMT on Aug. 28), announcing the start of the partial phase of today's deep lunar eclipse.
The umbral shadow will first appear as a small semicircle of shadow close to the dark expanses of Oceanus Procellarum (the Ocean of Storms) and Mare Humorum on the moon's southwestern edge, before swiftly spreading to swallow the nearby moonscape.
This partial phase of a lunar eclipse is the only opportunity most of us will get to see the grand sweep of Earth's silhouette with our own eyes, as our planet performs like a doll in a cosmic marionette, casting its shape in shadow against the backdrop of its natural satellite.
Stage 3: Maximum eclipse
The eclipse will reach its peak at 12:12 a.m. EDT (0412 GMT) on Aug. 28, as 96% of the lunar disk is smothered in Earth's umbral shadow, leaving a dazzling crescent exposed to direct sunlight on the moon's northern limb.
Around this time, you may notice a subtle red hue infuse the moon, as sunlight filtered through Earth's atmosphere is refracted, or bent onto its surface. It may appear as if the light from every sunset and sunrise on Earth is simultaneously striking the lunar disk, revealing prominent craters and dark lunar seas in spite of the shadow covering it.
Stage 4: Earth's inner shadow slips from the moon
Earth's inner umbral shadow will steadily retreat from the moon in the hours. The crimson hue that may have been visible at the height of the eclipse will gradually fade as the crescent of the lunar disk exposed to direct sunlight grows, and normality reasserts itself over the natural satellite.
The last vestige of Earth's inner shadow will depart the lunar surface at 1:51 a.m. EDT (0551 GMT) on Aug. 28.
Stage 5: Earth's outer shadow exits the Sturgeon Moon
Our planet's outer penumbral shadow will disappear from the Sturgeon Moon shortly after at 3:01 a.m. EDT (0701 GMT), bringing the eclipse to an end. We won't see another like it until New Year's Eve 2028, when a total lunar eclipse will be visible across Asia, Australia and Europe
Eager to photograph August's partial lunar eclipse? Then be sure to read our expert's guide on how to photograph a lunar eclipse, along with a roundup of the best cameras and lenses for astrophotography. You should also check out our picks of the best binoculars and telescopes available in 2026, which will give you a closer look at the moon as Earth's shadow swallows its ancient surface.
Editor's Note: If you capture a photo of the August lunar eclipse and want to share it with Space.com's readers, then please send your photo(s), comments, name and location to spacephotos@space.com.
