Overview: A rare planetary pairing at dusk
On November 12, skywatchers along the southwestern horizon will have a brief but memorable chance to glimpse two bright planets in close proximity as the sun dips below the horizon. Mars, the familiar red planet, will be joined by Mercury, the exhausting-to-spot inner world that rarely stays visible for long after sunset. The pair’s appearance near the glow of dusk makes for a striking sight and a timely reminder of how dynamic our night sky can be, even with the Sun still bright in the sky.
What to expect and when to look
The best viewing window occurs in the minutes just after sunset. Look low to the southwest as twilight fades; the sky will still carry a warm, orange hue, which helps create contrast for the planets. Mars typically dominates the scene with its brick-red hue, while Mercury glows with a steadier, pale-yellow light closer to the horizon. Timing is crucial, because Mercury’s proximity to the Sun means it disappears quickly. Have a clear, unobstructed panorama and be ready with your eyes or binoculars.
Why this pairing happens
The planetary alignment is a result of the orbital geometry of Mars and Mercury around the Sun. Mercury orbits closer to the Sun than any other planet, so it spends most evenings skimming the solar glare. Mars, farther out, climbs higher above the horizon earlier in the night, and some days align with Mercury as both planets appear in the same general sector of the sky. This is a relatively short-lived moment, making preparation and quick observation essential.
Tips for a successful sighting
- Find an unobstructed view: A flat southwestern horizon with minimal trees or buildings makes the pair easier to spot.
- Check local sunset times: In November, sunset occurs earlier in many places. Check a reliable astronomy app or local almanac for the exact time in your area.
- Use binoculars if available: Binoculars can help distinguish Mercury’s subtle brightness from the twilight glow, and Mars will appear distinctly red.
- Know the colors: Mars’ reddish hue stands out; Mercury will appear as a steady pale light near it.
- Stay patient and ready: The window is brief. Have your eyes adjusted to the darkness and your viewing aid ready before the sky fades.
What you’ll need
Minimal gear is enough for a satisfying view. A comfortable spot with a clear view, a pair of binoculars or a small telescope can enhance the scene, and a star chart or app can help confirm the planets’ positions as they move. Dress for the evening chill, bring a light layer, and give your eyes a few minutes to adapt to darkness for the best contrast.
Beyond the evening: what to watch for next
Even if you miss Mercury this time, Mars often remains visible well into the night during late autumn. You can plan ahead by noting subsequent planetary pairings and following local skywatching events. Subtle shifting of the planets against the background star field provides ongoing opportunities to observe planetary motion and refining your spotting technique over weeks and months.
Bottom line
November 12 offers a rare chance to see Mars and Mercury in a single dusk view. By choosing a clear, low southwestern horizon, timing your look just after sunset, and using binoculars if available, you increase your odds of enjoying this fleeting celestial moment. It’s a crisp reminder that even as daylight fades, the solar system remains full of movement and wonder.
