Miscellaneous
Total Solar Eclipse Crosses Europe on 12 August — Viewing Zones, Timing, and Safe Observation Methods
A total solar eclipse will traverse parts of Europe on Wednesday, 12 August, visible as totality in northern and central Spain, a sliver of Portugal, Greenland, and Iceland, while a deep partial eclipse—over 90% obscuration—will be seen across much of western Europe, including the UK, France, Belgium, Switzerland, and northern Italy.
A total solar eclipse will appear across European skies on Wednesday, 12 August. The Moon will pass directly between Earth and the Sun, fully blocking sunlight for observers within a narrow path of totality. This path stretches across northern and central Spain, a small portion of Portugal, and extends to areas of Greenland and Iceland. Across a far broader region—including the United Kingdom, France, Belgium, Switzerland, and northern Italy—a partial solar eclipse will occur, with the Sun nearing the horizon during the event.
What defines a solar eclipse?
A solar eclipse occurs when the Moon moves between Earth and the Sun, casting its shadow onto Earth’s surface. Observers located within the darkest part of that shadow—the “umbra”—witness a total solar eclipse, during which the Moon completely covers the Sun’s disc. Those situated in the outer, lighter portion of the shadow—the “penumbra”—see only a partial eclipse, where the Moon obscures only part of the Sun’s light.
Megan Argo, Professor of Astrophysics at the University of Lancashire and Deputy Chair of the Federation of Astronomical Societies, explains that a total solar eclipse requires extremely precise alignment of the Sun, Moon, and Earth. She notes that the Moon’s orbit is slightly inclined relative to Earth’s orbital plane, meaning such alignment does not occur every time the Moon passes between Earth and the Sun. Furthermore, visibility of totality depends entirely on geographic location: only those within the narrow track of the Moon’s umbral shadow can observe the full eclipse.
Why is the 12 August eclipse considered rare?
The 12 August eclipse marks the first total solar eclipse visible from continental Europe in approximately two decades. In the UK, the last total solar eclipse occurred in 1999, with parts of Devon and Cornwall lying within the path of totality. The next total solar eclipse visible from Britain will not occur until 2090.
Although the UK will not experience totality this time, it will witness a deep partial eclipse. More than 90% of the Sun’s disc will be obscured across large swathes of the country. Specifically, Cornwall is expected to see around 96% coverage, western Scotland approximately 93%, and London about 92%.
When and where will the eclipse be visible?
In Spain—where portions of the country fall inside the path of totality—the eclipse will reach maximum phase between 8:26 p.m. and 8:33 p.m. local time, shortly before sunset.
In London, the partial eclipse is scheduled to begin at 6:17 p.m. British Summer Time, peak at 7:13 p.m., and conclude at 8:06 p.m.
Because the Sun will sit low near the western horizon during the event, astronomers advise selecting observation sites with an unobstructed view toward the west—clear of buildings, trees, or other terrain features that could impede visibility.
How to observe safely?
Astronomers strongly warn against viewing the Sun directly with the naked eye at any stage of a solar eclipse. Such exposure can cause permanent eye damage. Ordinary sunglasses do not provide adequate protection. Only certified solar eclipse glasses—specifically designed and tested for direct solar viewing—should be used.
If eclipse glasses are unavailable, indirect viewing methods remain viable. These include constructing a simple pinhole projector or using a kitchen colander to project multiple images of the Sun onto a sheet of paper or cardboard. Crucially, observers must never look directly at the Sun through the pinhole or colander; the method relies solely on projecting the Sun’s image onto another surface for safe, indirect observation. During the partial phase, viewers will see the Sun’s disc progressively diminish as the Moon moves across it, forming an increasingly thin crescent before gradually returning to its full shape as the Moon continues its orbit.
Scientific value of solar eclipses
Beyond their visual spectacle, solar eclipses offer scientists a rare opportunity to study the Sun’s outer atmosphere—the solar corona. The corona is normally invisible due to the Sun’s overwhelming brightness but becomes clearly observable during totality. Researchers use eclipses to examine the corona’s chemical composition and how it changes in response to varying levels of solar activity and the approximately 11-year sunspot cycle.
Eclipses have also played pivotal roles in scientific history. In 1919, astronomers leveraged a total solar eclipse to measure the positions of stars near the Sun’s limb. That experiment provided critical observational confirmation of Albert Einstein’s general theory of relativity—specifically, his prediction that gravity bends light.
Lunar eclipse and meteor shower follow closely
The solar eclipse coincides with another astronomical event later in the same month. A partial lunar eclipse is forecast to be visible from the UK beginning just after 5 a.m. on 28 August. Solar and lunar eclipses occur in close succession because the Sun, Earth, and Moon achieve geometric alignment during this period—though the order of celestial bodies differs between the two phenomena.
Additionally, the Perseid meteor shower is expected to peak during the night of 12–13 August. Clear, dark skies—free of cloud cover and light pollution—could allow observers who remain outdoors after the eclipse ends to witness numerous meteors.
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