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Mercury's greatest eastern elongation on October 12
This article is based on explaining the timing and significance of Mercury's maximum eastern elongation on October 12, 2026. During this event, Mercury will appear visible at the western horizon immediately after sunset. At this time, Mercury will be 25 degrees away from the Sun, making it appear as a bright point with an apparent magnitude of approximately -0.1—brighter than many stars. It can be observed with the naked eye or through a telescope, which will show Mercury's illuminated disk at about 60% phase and roughly 6.75 arcseconds in diameter. This is the best apparition of Mercury visible from the Southern Hemisphere in 2026, although observing it from the North is more challenging due to the lower angle of the ecliptic. After reaching maximum elongation, Mercury will quickly approach the horizon until it disappears at the end of October, coinciding with its approach to the Sun on November 4, 2026. To observe it, it is recommended to look westward after sunset and search for a bright point of light above the horizon in the Libra constellation.
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