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

Unveiling the Celestial Canvas: Mercury's Elongation and Europa's Shadow

The night sky is a canvas of wonder, and on this particular Sunday, December 7, a special celestial event unfolds. Mercury, the elusive messenger of the gods, reaches its greatest western elongation from the Sun, presenting a dazzling spectacle for early-morning sky gazers.

But that's not all! On December 6, Europa, one of Jupiter's captivating moons, and its shadow make a dramatic appearance. This event, known as a transit, occurs when Europa passes in front of Jupiter, casting a shadow on the planet's disk. It's a rare and captivating sight, especially for those who rise early to observe the heavens.

Mercury, the smallest planet in our solar system, shines brightly in the predawn sky. On this day, it reaches its greatest western elongation, meaning it is positioned 21 degrees west of the Sun. At 6 A.M. local time, Mercury will be about 6 degrees high in the eastern sky, near the stars of Libra. With a magnitude of -0.4, it's easily visible in the still-dark sky, close to the fainter star Gamma Librae. Through telescopes, Mercury reveals a 7-inch wide disk, 61% illuminated, offering a captivating view.

The article provides essential details for sky enthusiasts, including local times for sunrise, sunset, moonrise, and moonset, as well as the Moon's waning gibbous phase (86% illumination). It's a comprehensive guide for those eager to explore the night sky and witness these celestial phenomena.

For more sky events and detailed observations, readers are encouraged to explore the 'Sky This Week' column and the specific articles on December 6, where Europa and its shadow grace the skies of Jupiter.

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