A rare celestial event is coming to Earth, giving us a chance to catch a glimpse of Mercury in its greatest elongation. This phenomenon occurs twice every 116 days and marks a milestone for the 4.503 billion-year-old planet.
Mercury, being a small planet close to the sun, can be difficult to spot. However, on August 19, sky gazers on Earth will have an opportunity to see Mercury at its greatest distance from the sun. During this period, the planet appears farthest from the sun, reducing the impact of the sun’s glare.
There are two types of greatest elongations: eastern and western. The one happening on August 19 is the greatest western elongation, best visible in the morning just before sunrise. Other planets like Venus reach greatest elongation only twice a year due to their orbit patterns around the sun.
To witness Mercury at its greatest elongation, look in the direction of the sunrise about 30 minutes before it rises. However, remember not to point your binoculars or telescope directly at the sun, as this can cause permanent eye damage.
Mark your calendars for August 19 and get ready to spot Mercury’s rarest moment of visibility.
Source: https://eu.usatoday.com/story/news/world/2025/08/18/mercury-greatest-elongation-august/85710180007