Mercury at Greatest Western Elongation: How to Spot It in the December Sky (2026)

Get ready for a celestial spectacle! On December 7, the planet Mercury will be at its most dazzling in the early morning sky, marking a significant moment in its orbit around the Sun.

But here's the twist: Mercury will reach its greatest western elongation, appearing 21° west of the Sun. This means it will be a stunning sight for early risers, rising nearly two hours before the Sun and shining at magnitude –0.4. Imagine witnessing this tiny planet, a mere 7" wide and 61% illuminated, against the dark canvas of the predawn sky!

Here's a breakdown of this astronomical event:
- December 7: Mercury's big day! It will be 21° from the Sun, visible in the eastern sky an hour before sunrise. Look for it near the bright stars of the Libra constellation.
- December 6: A notable prelude—Europa's shadow dance. Europa, one of Jupiter's moons, and its shadow will cross Jupiter's disk, creating a fascinating celestial show.
- Early Morning Mercury: For dedicated skywatchers, Mercury is visible at 6 A.M. local time, rising in the east at 6° elevation. Through a telescope, you'll see its partially lit disk, with lighting oriented in a unique way, revealing the Sun's direction.
- Essential Details: The article provides ephemeris data, including local times for sunrise, sunset, moonrise, and moonset, ensuring you don't miss any part of the show. And don't forget, always pack up your telescope before sunrise to protect your eyes!

And this is where it gets intriguing: Mercury's position at greatest elongation offers a unique perspective on our solar system's dynamics. But is it worth waking up early for? Share your thoughts on whether you'd set your alarm for this celestial event. Are you team 'early bird' or 'sleeping in'?

Mercury at Greatest Western Elongation: How to Spot It in the December Sky (2026)

References

Top Articles
Latest Posts
Recommended Articles
Article information

Author: Catherine Tremblay

Last Updated:

Views: 6252

Rating: 4.7 / 5 (67 voted)

Reviews: 82% of readers found this page helpful

Author information

Name: Catherine Tremblay

Birthday: 1999-09-23

Address: Suite 461 73643 Sherril Loaf, Dickinsonland, AZ 47941-2379

Phone: +2678139151039

Job: International Administration Supervisor

Hobby: Dowsing, Snowboarding, Rowing, Beekeeping, Calligraphy, Shooting, Air sports

Introduction: My name is Catherine Tremblay, I am a precious, perfect, tasty, enthusiastic, inexpensive, vast, kind person who loves writing and wants to share my knowledge and understanding with you.