We’re just a few short days away from the Aug. 12 total solar eclipse, when millions will watch as the moon glides across the face of the sun, hiding its light in a wondrous display of orbital mechanics.
The eclipse will unfold during August’s new moon phase, as the lunar disk slips silently between the sun and Earth in the daytime sky. Ordinarily, the subtle tilt in the moon’s orbit causes its shadow to pass just below, or above our planet, missing it entirely.
However, on Aug. 12, the moon’s orbit will carry it into a near-perfect alignment with the sun and Earth, casting its colossal shadow across a 182-mile-wide corridor known as the path of totality, where viewers will get to see the lunar disk fully hide the sun’s disk.
The path of totality for the Aug. 12 eclipse cuts through Spain, Iceland and Greenland. Hundreds of millions more watching from outside of this narrow corridor will also bear witness to a spectacular partial solar eclipse, as the moon passes in front of our parent star, without fully obscuring its surface. Those unable to watch the eclipse in person by dint of geography can also follow along online, with details of the livestream to be released closer to the event.
Read on to discover what will happen during each stage of the Aug. 12 total solar eclipse.
Stage 1: The partial eclipse begins
The partial phase of the eclipse officially begins at the moment of “first contact”, when the lunar disk takes its first nibble out of the sun — a subtle transformation that will first become visible in the skies over the U.S. state of Alaska at 11:34 a.m. EDT (1534 GMT) on Aug. 12.
You can check out exactly when the partial eclipse will begin from your location and find out exactly how much of the sun will be hidden by the moon using Time and Date’s interactive eclipse tracker.
The hour and a half following first contact will see the moon sink ever farther into the sun’s disk for those in the path of totality, transforming it from a burning orb into a magnificent shining crescent.
You may notice the temperature drop noticeably, accompanied by a subtle darkening of the sky in the half hour preceding the climactic phase of totality, as the moon reduces the sun to a thin sickle in the evening sky. Pinpricks of light — such as those that shine through a colander, or the gaps in a leaf — will also appear to mirror the scene above, creating a kaleidoscope of tiny bright crescents.
Remember, staring at the sun for even the briefest of moments can lead to permanent loss of vision, so be sure to read our guide on how to view the sun safely and to wear your eclipse glasses or sunoculars during the entirety of the partial phases of the eclipse. You can read our roundup of the best solar viewing equipment to find out more, along with our tips on how to check the quality and condition of your eclipse glasses.
Stage 2: Second contact
Some of the most spectacular moments of an eclipse occur just before and after totality. First, look out for the “diamond ring” effect, as the last sliver of the sun peeks out from behind the lunar disk to appear as a gorgeous celestial jewel, while the outermost layer of our star’s atmosphere, the corona, creates a glowing halo around the moon.
Tear your eyes away from the sun for just a second and you may just catch sight of the moon’s shadow advancing on you from the west, before it engulfs your surroundings in a false night.
The final seconds before totality will see bright “Baily’s Beads” form dazzling points of light on the moon’s edge, where the last shreds of the sun’s disk shine through the ravines and valleys that scar the ancient lunar surface.
Stage 3: Totality & maximum eclipse
As the last of the sun’s surface slips behind the moon, totality begins. This is the climactic phase of the eclipse, when the moon acts like a natural coronagraph to block the brilliance of the sun’s disk, ushering in a false night in which our star’s outer atmosphere can be seen leaping out from the lunar silhouette.
Totality will last a maximum of 2 minutes, 18 seconds, during which time it’s safe to remove your glasses and look at the sun. Just be sure to put them on again before its fiery disk reemerges from the other side of the lunar disk.
That white halo surrounding Earth’s natural satellite is the sun’s corona — a jacket of superheated gas that surrounds our parent star. Look out for glowing solar prominences leaping outward through the sun’s atmosphere, along with the red line of the chromosphere — the layer of the sun’s atmosphere beneath the corona — which appears fleetingly at the beginning and end of totality, according to NASA.
The point of maximum eclipse occurs roughly halfway through totality, when the sun’s disk is most hidden by the moon.
Eagle-eyed skywatchers may catch Jupiter and Mercury shining to the lower right of the eclipsed sun in the faux twilight experienced during totality, while Venus will appear as a bright star-like object to its upper left. If you’re incredibly lucky, you could even spot one of the brightest shooting stars or fireballs of the Perseid meteor shower, which comes to a peak around the same time as the Aug. 12 total eclipse.
Stage 4:Totality ends
The fourth stage of the eclipse comes as the very edge of the sun’s disk emerges from behind the moon, marking the end of totality as Bail’s Beads and the diamond ring effect play out in reverse, before giving way to an ever-thickening solar crescent.
Stage 5: The partial eclipse ends.
The waning partial eclipse will come to a global end at 3:57 p.m. EDT (1957 GMT), as the moon’s silhouette exits the sun’s disk in the skies off the west coast of Africa — a moment known to astronomers as fourth contact.
Space.com is on hand to provide expert coverage and on the ground reporting as the eclipse unfolds. Skywatching Editor Daisy Dobrijevic is undertaking an expedition with HX to observe the total solar eclipse from the waters around Greenland, while Skywatching Writer Anthony Wood heads to Spain in a cowboy hat, to catch the orbital showdown with citizen scientists from NASA’s Dynamic Eclipse Broadcast Initiative.
Be sure to check out our total eclipse live blog to stay up to date with all the latest news, along with our handy explainer article detailing everything you need to know about the Aug. 12 total solar eclipse.
If photography is your thing then why not read our guide to imaging the total solar eclipse, along with our roundup of the best cameras and lenses for astrophotography? You’ll also want to peruse our picks for the best eclipse glasses and viewing gear available in 2026.
Editor’s Note: If you capture footage of the Aug. 12 total solar 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.
