Mercury reaches greatest eastern elongation on October 12, 2026, when it sits about 25° east of the Sun as seen from Earth. Because it is east of the Sun, Mercury sets later than the Sun on that evening apparition, so it is visible low in the western sky after sunset. The phrase “farthest from the sunset” is a loose way of describing this. It refers to the angle between Mercury and the Sun on the sky, not to how far Mercury is from the Sun in space.
What “farthest from the sunset” actually measures
Astronomers call the maximum angle between an inner planet and the Sun its elongation. Greatest eastern elongation is the point at which Mercury’s apparent separation from the Sun, measured eastward along the sky, is at its largest. The National Astronomical Observatory of Japan (NAOJ) lists the separation at 25°10′ for this event. EarthSky, in an article published October 9, 2026, describes it as about 25°.
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That figure is an angle, not a distance. A fist held at arm’s length spans roughly 10°, so Mercury is about two and a half fist-widths from the Sun on the sky. The date does not mark a special point in Mercury’s orbit, and nothing about the Sun or Mercury becomes unusually distant in space. The only thing that peaks is the apparent separation.
When the event happens, by time zone
NAOJ gives the time as 19h JCST, which corresponds to 10:00 UTC. EarthSky gives 10 UTC. The Philippine weather and astronomy agency PAGASA lists the event at 6:03 p.m. Philippine Standard Time, which is within a few minutes of the same instant once converted. The table below converts the 10:00 UTC instant to local clock time for several regions. Each conversion is simple arithmetic from the standard offset named in the first column.
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| Region and time standard | UTC offset | Local clock time at the peak, October 12, 2026 |
|---|---|---|
| Universal Time (UTC) | UTC+0 | 10:00 |
| Japan (JST, as NAOJ lists it) | UTC+9 | 19:00 |
| Philippines (Philippine Standard Time) | UTC+8 | 18:00 by whole-hour conversion; PAGASA lists 6:03 p.m. |
| United Kingdom (BST) | UTC+1 | 11:00 |
| US Eastern (EDT) | UTC−4 | 06:00 |
| US Pacific (PDT) | UTC−7 | 03:00 |
| Sydney, Australia (AEDT, daylight saving in effect in October) | UTC+11 | 21:00 |
The peak is an instant, and in many regions that instant falls in daylight or before dawn. Mercury cannot be seen at the moment of greatest elongation from much of the Americas or Europe. What matters for observers is the set of evenings around October 12, when Mercury remains in the western sky after sunset at a useful height. Use a planetarium program or app set to your exact location to find Mercury’s setting time on those evenings. The sources do not establish a single best local observing time for all readers.
How to look for Mercury after sunset
- Find the sunset time for your location and date, using an almanac, a weather service, or a planetarium program.
- Choose a site with a clear, flat, unobstructed view of the western horizon. Buildings, trees, hills and haze can all hide a low object.
- Start looking soon after sunset, while the sky is still darkening but Mercury has not yet set. Twilight brightness is the main constraint, so waiting for full darkness can mean Mercury has already dropped out of view.
- Scan the western sky with the naked eye first. Mercury will look like a bright star-like point, not a disk.
- If you use binoculars, use them only after sunset and only to scan the low western sky. They are optional, and they do not guarantee that you will see the planet.
Why low altitude makes Mercury hard to see
Mercury stays close to the Sun in the sky, so even at greatest elongation it remains low, and it sets soon after the sky darkens. Several factors decide whether you will see it on a given evening:
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- Horizon angle. The ecliptic, the path along which the Sun, Moon and planets appear to move, meets the evening horizon at a shallow angle in autumn for some latitudes. Planets then sink quickly toward the horizon instead of standing high above it.
- Altitude. NASA’s general guidance for naked-eye planet viewing is that an object should be at least a few degrees above the horizon, with 10° or higher best. This is general guidance, not a Mercury-specific threshold.
- Twilight. NASA notes that a low object in twilight can be difficult to spot because the surrounding sky is still bright.
- Atmosphere and obstructions. Haze, humidity, smoke and nearby terrain can dim or block a low planet even when the geometry is favorable.
Who gets the better view
EarthSky notes that the 2026 evening apparition is relatively favorable for the Southern Hemisphere. Autumn evening elongations are generally harder to see from the Northern Hemisphere, for the same shallow-horizon reason described above. Observers in the Northern Hemisphere should still check their local sky, because a clear horizon at a suitable site can make a difference even when the overall geometry is less favorable.
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Keep optics away from the Sun
Never point binoculars or a telescope toward the Sun, even briefly, because direct sunlight through optics can cause permanent eye damage. The Royal Observatory Greenwich advises waiting until after sunset before using binoculars or a telescope when observing near the Sun. Apply the same rule on the day of the event and on the days before and after it.
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What the sources establish and what they do not
- NAOJ’s table is a calculated ephemeris, and it identifies JCST as its time basis. NAOJ notes that its values may differ from figures reported elsewhere as calculations and parameters change.
- PAGASA’s 6:03 p.m. figure is a Philippine local time.
- EarthSky’s October 9, 2026 article supplies the 10 UTC time, the approximate 25° separation, and the hemisphere and season context.
- NASA’s guidance on twilight and horizon visibility is general, and is not specific to Mercury or to any location.
- No source establishes a universally best local observing time, and none guarantees that a particular reader will see Mercury on a particular evening.
In short, the date is October 12, 2026, the separation is about 25°, and the event is an evening apparition. Whether you can see Mercury depends on your local sunset time, the clarity of your western horizon, and the altitude it reaches before it sets.
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