The UK’s most complete solar eclipse in 27 years is nearly here. Here’s how to watch it safely

The United Kingdom is set to experience its most complete solar eclipse in 27 years on 12 August, with the moon passing directly between the sun and Earth, blocking most of the sun’s light. The event will be visible across the entire country, offering a rare opportunity for observers to witness a celestial phenomenon that has not occurred this fully since 1999. Authorities have issued warnings about the dangers of improper viewing methods, emphasizing the need for protective measures to prevent eye damage. The eclipse will begin with “first contact” in Scotland at 6:08 pm local time, with other regions following shortly thereafter. In Manchester and Liverpool, the first glimpse of the eclipse will appear at 6:13 pm, while in London, Bristol, and Cardiff, it will be visible starting at 6:17 pm. Observers in Cornwall will see the initial phase at 6:18 pm. The peak of the eclipse will occur between 7:05 pm and 7:16 pm, depending on the observer’s location. The event will conclude for all parts of the UK around 8:10 pm. The visibility of the eclipse varies across the country, with the South West experiencing the highest level of coverage, approximately 95 percent of the sun’s disk will be obscured by the moon. In contrast, London residents will see about 90 percent of the sun blocked. This variation is due to geographical differences in the alignment of the sun, moon, and Earth, affecting how much of the sun is visible from different locations. Health officials have stressed the importance of using proper equipment to observe the eclipse. The UK Health Security Agency (UKHSA) warns that even brief exposure to direct sunlight during an eclipse can cause irreversible damage to the eyes. Permanent injury can occur within seconds if individuals fail to follow safety guidelines. The agency notes that the sun’s intensity during an eclipse can overwhelm the body’s natural instinct to look away, leading to retinal damage without immediate symptoms. To ensure safe viewing, experts recommend using specialized eclipse glasses that meet the ISO 12312-2:2015 international safety standard. These glasses must clearly display the certification label. Reused glasses may pose a risk if the lenses are damaged, as their filtering capabilities could be compromised. Ordinary sunglasses, regardless of darkness, offer insufficient protection against the sun’s harmful rays. Alternative methods for observing the eclipse include using a pinhole viewer or constructing a pinhole projector. A colander can serve as a makeshift pinhole projector, casting a shadow that allows indirect observation of the sun’s image. Similarly, the patterns created by sunlight passing through leaf gaps on the ground act as natural pinhole projectors. These methods allow viewers to enjoy the spectacle without risking their vision. The Royal Museums Greenwich, which operates the Royal Observatory, has advised the public to purchase new eclipse glasses rather than relying on outdated ones. They emphasized the potential hazards of using unsafe equipment and urged individuals to prioritize eye health over convenience. For those unable to attend in person, the Royal Observatory will broadcast a live stream of the eclipse on 12 August, providing access to the event for those who cannot view it directly. Historical data underscores the risks associated with improper eclipse viewing. Following the 1999 solar eclipse, the Royal College of Ophthalmologists recorded approximately 70 cases of vision issues, with nearly half of those affected having observed the event for less than a minute. These incidents highlight the critical need for adherence to safety protocols, even for short periods of exposure. As the date approaches, preparations are underway across the UK to ensure the public can observe the eclipse safely. Educational institutions, science centers, and observatories are expected to host events and provide guidance on proper viewing techniques. The combination of scientific awareness and community efforts aims to make this historic astronomical event both accessible and secure for all observers.