When the Sun Disappeared: Reviewing the August 2026 Solar Eclipse
- DEREK MCDERMOTT
- Aug 16
- 6 min read
On 12 August 2026, millions of people across Europe looked towards the Sun as the Moon passed directly between Earth and our star.
For observers within the narrow path of totality, this was far more than an impressive partial eclipse. For a few extraordinary minutes, the Sun's brilliant disc disappeared completely, daylight faded into darkness and the delicate outer atmosphere of the Sun — the corona — became visible to the naked eye.
The 2026 eclipse was particularly special for Europe because the path of totality crossed Iceland, northern Spain and a small part of Portugal. Much of the rest of Europe, including Ireland and the United Kingdom, experienced a very deep partial eclipse rather than totality.
For Spain, however, this was the main event. The country found itself directly beneath the Moon's shadow as the eclipse arrived during the evening, with totality occurring shortly before sunset.
A Total Eclipse Across Spain
The path of totality entered Spain in the northwest and crossed a broad diagonal route through the country before reaching the Balearic Islands.
Locations including León, Zaragoza and Valencia experienced totality, while cities just outside the path saw a spectacular but fundamentally different partial eclipse. NASA's predictions put totality in León at approximately 8:28–8:30 p.m. local time, Zaragoza at approximately 8:29–8:30 p.m., and Valencia at approximately 8:32–8:33 p.m.
The Spanish eclipse had another remarkable characteristic: the Sun was very low in the western sky. This transformed the event into a kind of cosmic sunset. As the Moon gradually covered the Sun, the sky became increasingly strange and atmospheric. Then, for observers inside the path of totality, the final sliver of sunlight vanished. Day briefly became night.
The Moment of Totality
Totality is the moment that gives a total solar eclipse its extraordinary reputation.
As the Moon moves across the Sun, the visible crescent becomes progressively thinner. The final moments can include rapidly changing phenomena such as Baily's beads, produced when sunlight shines through valleys and irregularities along the Moon's rugged edge.Then the last brilliant point of sunlight disappears.
For a short time, the Moon becomes a black silhouette surrounded by the pearly-white corona. The corona is the Sun's extremely hot outer atmosphere. Under normal circumstances it is overwhelmed by the much brighter photosphere, making it impossible to see with the naked eye. Totality changes that completely. Streams and structures in the corona extend outward from the dark lunar disc, shaped by the Sun's magnetic field.
Prominences can also appear as reddish or pink structures around the edge of the Moon.
For observers in Spain, all of this occurred against the extraordinary backdrop of an approaching sunset.
An Eclipse at Sunset
The Spanish eclipse was unusual because totality occurred very close to sunset.
This produced an eclipse unlike the famous midday totalities seen in places such as Mexico during the 2024 eclipse.Instead of the Sun being high overhead, observers in Spain watched the eclipsed Sun descend towards the western horizon.
This created the possibility of seeing the darkened Sun surrounded by the solar corona while the landscape remained illuminated by the rapidly changing colours of sunset.
The low altitude also made the choice of observing location particularly important. A completely unobstructed western horizon was essential.
For eclipse observers, the combination of totality and sunset created one of the most visually dramatic astronomical events Europe has experienced in years.
A Spectacular Event for Ireland and the Rest of Europe
Sequence of August 2026 Eclipse Images taken from Galway Ireland with my SeeStar S30 Pro smart Telescope - Derek McDermott
Ireland was outside the path of totality, but that certainly did not make the eclipse uninteresting.
From Dublin, approximately 94% of the Sun was obscured at maximum eclipse. Across much of Ireland, the Moon covered the vast majority of the solar disc, producing a noticeably darker and more unusual afternoon and evening sky.
The same was true across much of Britain and continental Europe.
London experienced approximately 91% coverage, Lisbon around 95%, Paris approximately 92%, and Algiers around 96%.
For millions of Europeans, therefore, 12 August 2026 was a remarkable partial eclipse rather than a total one. But there was always a tantalizing difference. Some observers were watching a crescent Sun. Others, only a relatively short distance away along the path of totality, were watching the Sun disappear completely.
The Science Behind the Darkness
A total solar eclipse occurs because of an extraordinary coincidence of cosmic geometry.
The Sun is roughly 400 times larger than the Moon, but it is also approximately 400 times farther away from Earth.
As a result, the two objects appear remarkably similar in angular size from our planet.
When the alignment is sufficiently precise, the Moon can completely cover the Sun's photosphere. The Moon's shadow then falls across the Earth's surface. The darkest central part of that shadow is called the umbra. Only observers inside this relatively narrow region experience totality.
Outside it, observers fall within the Moon's penumbra and see a partial eclipse.
The 2026 eclipse provided a spectacular demonstration of this geometry on a continental scale, as the Moon's shadow swept across the North Atlantic before reaching Spain. NASA's eclipse maps show the narrow red path of totality crossing Greenland, Iceland and Spain, surrounded by a much larger region where a partial eclipse was visible.
More Than Just a Spectacle
A total solar eclipse is also a valuable scientific opportunity.
During totality, the normally hidden solar corona becomes accessible to observation. Scientists can study its structure and behavior, while the sudden reduction in sunlight provides an opportunity to investigate how Earth's atmosphere responds to the rapid change in solar radiation.
For the 2026 eclipse, NASA supported scientific experiments in both Iceland and Spain. A NASA-funded team used a WB-57 high-altitude research aircraft to investigate the solar corona, while balloon experiments were conducted to study changes in Earth's atmosphere associated with the temporary loss of direct sunlight.
This combination of public spectacle and scientific investigation is one of the things that makes solar eclipses so valuable. For a few minutes, the Moon effectively creates a natural laboratory in the Earth's atmosphere.
The Verdict
The August 2026 solar eclipse lived up to its billing as one of Europe's great astronomical events.
For Spain, it was an historic occasion. The country was positioned directly beneath the Moon's shadow and experienced genuine totality, with the added drama of the Sun being close to the western horizon.
For Iceland, the event provided another spectacular opportunity to experience totality. For Ireland, Britain and much of continental Europe, the eclipse was partial — in some locations exceptionally deep — but still a memorable astronomical event.
Perhaps the biggest lesson from the eclipse was the difference between almost total and total.
A 94%, 95% or even 99% partial eclipse can be spectacular. But totality is something else entirely.
When the last sliver of sunlight disappears, the rules seem to change. The Sun's corona emerges, daylight collapses into darkness and for a brief moment we see our nearest star in a completely different way. The Moon has not become larger. The Sun has not become darker.
Nothing fundamental about the universe has changed.
Yet from our particular vantage point on Earth, the alignment is perfect.
And for those few minutes on 12 August 2026, the Moon really did make the Sun disappear.
Looking Ahead: Another Total Eclipse in 2027
For eclipse enthusiasts, Spain's story does not end with 2026. The country is set to experience another total solar eclipse on 2 August 2027. That eclipse will provide another opportunity for observers in Spain to experience totality, making the country an increasingly important destination for eclipse tourism and astronomy enthusiasts.
The sequence of eclipses affecting Spain in 2026, 2027 and 2028 has been described as an exceptional period for astronomical observation, with the 2028 event being annular rather than total. For anyone who travelled to Spain in 2026, the prospect of returning in 2027 is therefore difficult to resist. The Moon will once again pass in front of the Sun.
The landscape will once again fall into darkness. And, for a few precious minutes, the corona will once again become visible.
The August 2026 eclipse may be over, but the era of spectacular Spanish eclipses has only just begun.
The Smart Astronomer — August 2026
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