Mercury at greatest western elongation
Saturday, November 21, 2026
Mercury is bright and well placed in the dawn sky.
Mercury at greatest western elongation
Mercury is bright and well placed in the dawn sky.
What Is Greatest Elongation?
Greatest elongation is when an inner planet appears farthest from the Sun in the sky from Earth’s point of view.
This applies to Mercury and Venus because their orbits are inside Earth’s orbit.
At greatest elongation, the planet is usually easier to see because it is separated farther from the Sun’s glare.
Why Greatest Elongation Matters
For Mercury, greatest elongation often provides one of the best chances to see the planet.
The event tells observers whether to look in the evening sky after sunset or the morning sky before sunrise.
It is a practical planning marker for observing planets that stay close to the Sun.
How To Observe Greatest Elongation
- Confirm whether the elongation is in the morning or evening sky.
- Find a clear, low horizon in the correct direction.
- Begin looking during twilight, but never point binoculars or a telescope near the Sun.
- Use binoculars only after the Sun is safely below the horizon for evening events or before sunrise with caution.
- Check local weather and haze near the horizon.
How To Plan Around This Event
Use this event as a planning marker, then confirm your local weather, cloud cover, Moon conditions, and horizon visibility before observing.
Ephemeris can help you compare this event with your local observing forecast, tonight's visible targets, and your saved telescope rigs.
Common Questions About Mercury at greatest western elongation
When does Mercury at greatest western elongation occur?
Mercury at greatest western elongation is listed for November 21, 2026.
Can I observe this event from my location?
Visibility depends on your location, local weather, horizon, and timing. Check the event visibility notes and compare them with your local forecast.
What equipment should I use?
Recommended equipment for this type of event: Naked eye or binoculars.