A short twilight window over the western horizon will show Venus, Mercury, and Jupiter in a slanted line along the ecliptic. Here is the timing, the identification sequence, and the phase contrast that rewards a prepared observer.
Three planets, lined up along the ecliptic, will hang low over the western horizon for about 30 to 45 minutes after sunset on June 12, 2026. The lineup is fleeting, and the geometry is forgiving: Venus will find you first, and the rest is a short, deliberate drift down and to the right.
According to Space.com's June 12 stargazing guide, Venus and Jupiter came within a close conjunction on June 9, 2026, and have since drifted slightly apart. Mercury, climbing up from the sun's glare, has joined them, and the result is a slanted line of three planets tracing the plane of the solar system, hanging just above the west-northwestern horizon for one short evening.
The window opens about 30 minutes after local sunset and closes before the planets sink into horizon haze. Plan around twilight, not full dark. The planets do not need a dark sky; they need a low, clear horizon. Pick a spot with no trees or buildings to the west-northwest, and arrive ten minutes early so your eyes adjust to the bright sky.
Once the sky has gone a deep blue, scan the west-northwest for the brightest object above the horizon. That is Venus, and it is unmistakable. From there, let your eyes drift down and slightly right, following the slant of the ecliptic. Mercury is the harder catch: small, lower, and quieter, sitting closer to the horizon. Jupiter, if the seeing cooperates, is a pale point just above Mercury, completing the line.
The phase contrast is the real reward. Through a small telescope or a phone held to a stable eyepiece, Venus resolves to a small, brilliant disk at roughly 80% gibbous, fat and bright. Mercury shows a sharp 50% half-phase, the kind of geometry most observers only ever see in textbooks. The phase is the proof of mechanism: a planet is moving through its orbit relative to the sun, and the geometry is doing the showing.
Jupiter is the bonus. Sitting only a few degrees above the horizon, it sits in turbulent air, and the cloud belts the planet is famous for will be smeared into a pale oval at best. Treat any visible detail as a gift, not a guarantee. A steady atmosphere, not a stronger scope, is what decides the outcome.
A wide-angle lens on a tripod will catch all three planets in one frame against a deep blue twilight sky. A smartphone, held steady and exposed for a second or two against the bright sky, can do the same. The composition question is the same as the observation question: get low, find Venus, then let the line take you down toward the horizon.
If the evening of June 12 is clouded out, do not despair. The geometry persists for several nights, with the planets shifting relative to each other, and Venus and Jupiter remain evening objects for weeks. The 12th is the tightest alignment; nearby nights are a different picture, not a lesser one.