Mercury Reaches Best 2026 Viewing on June 16 at Greatest Eastern Elongation

Q: Mercury is notoriously elusive. What visual guides in tonight's sky can lead you directly to this hard-to-spot planet?

Use Venus and Jupiter as the main signposts: shortly after sunset, look low in the western to northwestern sky for the bright Venus-Jupiter pair, then look below and slightly to their lower right/under that line for Mercury, which will be much dimmer and sit less than 20 degrees above the horizon. The two brighter planets are the easiest guide because they form a clear line above Mercury. Venus is the brightest object in that part of the sky, with Jupiter nearby, and Mercury appears beneath them in the twilight. A very thin crescent moon may also help: if you can pick it out, it should sit to Mercury’s lower right, though it will be difficult to see in the glow after sunset. Timing and horizon matter. The best chance comes about 30 to 45 minutes after sunset, with a clear, unobstructed western horizon. Mercury is bright enough to be seen with the naked eye, but binoculars can make it much easier to identify against the fading twilight. So the practical route is simple: find brilliant Venus, note Jupiter nearby, then trace downward toward the horizon to the fainter point of light below them—that is Mercury.

Q: Why is tonight's rare 'planet parade' just a cosmic illusion, and what does it reveal about our solar system's true structure?

Tonight’s “planet parade” is a visual alignment, not a real one in space. Mercury, Venus and Jupiter only seem to cluster because Earth is viewing them along nearly the same line of sight in the western sky after sunset. In reality, they remain separated by enormous distances and are orbiting the Sun on different tracks. The effect happens because the planets move in nearly the same flat plane, called the ecliptic. From Earth, that shared plane makes them appear to line up along a narrow path across the sky. Mercury’s greatest elongation on June 15 makes the illusion especially striking, because the planet is temporarily far enough from the Sun’s glare to be seen below Venus and Jupiter. What this reveals about the solar system is not a neat straight-line arrangement, but a broad, three-dimensional system with planets spread far apart. Their orbits are only roughly coplanar, not identical, and each orbit is tilted slightly by a few degrees. That is why “planet parades” are common as skywatching events but true perfect alignments in space are essentially nonexistent. The event also underscores how perspective can compress depth. Venus and Jupiter may look close together, but one can be hundreds of millions of kilometers farther away than the other. So the parade is real as an observing experience, but illusory as a physical gathering. It is a reminder that the solar system is orderly, flat-ish, and vast—not a row of planets standing side by side.

Q: Despite being closest to the sun, why isn't Mercury the hottest planet in our solar system?

Mercury is not the hottest planet because it cannot hold onto heat, while Venus can. Venus, not Mercury, has the highest surface temperature in the solar system. Mercury is closest to the sun and its dayside can reach about 427°C, but it has almost no atmosphere—only a very thin exosphere. That means heat absorbed during the day escapes quickly back into space. As a result, Mercury experiences extreme temperature swings, dropping to about -173°C on the night side. Its average temperature is therefore lower than Venus’s. Venus is farther from the sun, but its atmosphere is extraordinarily dense and made mostly of carbon dioxide, with thick clouds that help trap heat. This creates a runaway greenhouse effect: sunlight gets in, but the heat radiated back from the surface is prevented from escaping efficiently. That keeps Venus at roughly 464°C across much of the planet, day and night. So proximity to the sun alone does not determine which planet is hottest. Mercury receives more direct solar energy, but without a substantial atmosphere it cannot retain that heat. Venus’s massive, heat-trapping atmosphere is the reason it is hotter overall.

3 articles · Updated · CGTN · Jun 14

June 16 gives skywatchers their best chance this year to spot Mercury, as the planet reaches greatest eastern elongation and stays relatively high above the western horizon after sunset.
About 30 minutes after sunset offers the clearest window, with Mercury shining near magnitude 0.5 and becoming visible to the naked eye under favorable conditions.
Venus and Jupiter can help observers find it: Mercury will appear below and to the right of Jupiter, while Venus sits to Jupiter's upper left.
Open western horizons are recommended, and astronomers advise waiting until after sunset before using binoculars or small telescopes to avoid eye damage from the Sun.