Mercury has reached its greatest western elongation, positioning it at its maximum apparent distance from the sun in the morning sky. This configuration provides one of the most favorable viewing opportunities of the year for observing the solar system’s innermost planet.
The planet’s small orbit typically keeps it close to the sun, causing it to be obscured by the bright light of dawn or dusk for much of the year. During periods of greatest elongation, however, the geometric arrangement allows Mercury to be observed at a greater angular distance from the sun, making it more visible against the lightening sky.
Over the next several mornings, Mercury will continue to brighten, improving visibility as the contrast with the gathering dawn increases. Observers will need to begin observations early and ensure they have a clear, unobstructed view toward the east-north-east. From London, the planet should become visible approximately a handspan above the horizon between 04.30 and 05.00 BST. While binoculars can aid in spotting the planet, viewers should exercise caution and discontinue their use well before sunrise to avoid eye damage.
As an additional benefit, Mars will be more readily visible during the same viewing window, positioned higher and further to the east, providing an additional celestial target for morning observers.
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