Mercury, the solar system’s innermost planet, is putting on a show for early risers in the northern hemisphere this December. For a few days, the planet will reach its greatest western elongation – meaning it’s as far from the sun as it gets from our perspective on Earth. This alignment provides one of the best viewing opportunities of the year.
Why This Matters
Mercury is notoriously difficult to spot. It always stays close to the sun, making it appear lost in the glare. But during elongation, it becomes briefly visible in the pre-dawn sky, shining brightly just before sunrise. This is a chance for observers to see a planet that’s usually hidden in plain sight.
How to See It
The best views will be between 30 and 60 minutes before sunrise. Look towards the south-eastern horizon. For observers at mid-northern latitudes (like London), Mercury will appear as a distinct, bright star-like object. It will be the last bright object to fade as the sky lightens.
- Time: Before sunrise (check local sunrise times).
- Direction: South-east horizon.
- Equipment: No telescope is needed; Mercury will be visible to the naked eye.
Caution: Never Look at the Sun
While binoculars can help, never use them around sunrise. Even a brief glance at the sun through binoculars can cause severe and permanent eye damage. The risk isn’t worth the reward; Mercury will be visible without assistance.
Visibility in the Southern Hemisphere
The view is less favorable for observers in the southern hemisphere, but still possible with a clear eastern horizon.
This rare alignment offers a unique chance to witness one of our solar system’s most elusive planets. Keep an eye on the pre-dawn sky this week and enjoy the spectacle.
