Tonight

Mercury farthest from the sunset on November 16

Earth and Mercury orbits with sun in middle and red lines of sight from Earth to Mercury and the sun.
At greatest elongation, Mercury is to one side of the sun and is at its greatest distance from the sun on our sky’s dome. Mercury reaches greatest eastern (evening) elongation from the sun on July 22, 2024. It is then 27 degrees from the sun in the evening sky. This July elongation carries Mercury as far from the sun as it will be in 2024. Chart via EarthSky. .

Mercury is our sun’s innermost planet. So it always lies near the sun in our sky. Mercury is now back in the west after sunset. It’ll reach its greatest elongation, its greatest apparent distance from the sun in our sky, on November 16, 2024.

Mercury after sunset in November 2024

Where to look: Look west, in the sunset direction – shortly after sunset – for Mercury.
Greatest elongation: Mercury is farthest from the sun on our sky’s dome at 8 UTC (2 a.m. CDT) on November 16, 2024. At that time, Mercury will be 23 degrees from the sun in our sky. See A comparison of elongations, below.
Brightness: Mercury emerged in the evening sky in late October. Since then, it’s been shining at -0.3 magnitude. At greatest elongation it’ll be farther from the sunset glare and still brighter than most stars! In the evenings after greatest elongation, the innermost planet will rapidly fade as it sweeps up from behind Earth, in orbit around the sun, causing its illuminated side, or day side, to turn away from us. It’ll disappear by the end of the month and will reach inferior conjunction – when it passes between Earth and the sun – on December 6 at 2 UTC.
Through a telescope: Mercury will appear about 46% illuminated at greatest elongation. It’ll measure 6.6 arcseconds across.
Constellation: Mercury will lie in front of the constellation Ophiuchus the Serpent Bearer at this elongation. Doubtless, most of the stars in this constellation will be lost in the twilight.
Note: As the innermost planet, Mercury is tied to the sun in our sky. As a result, it never ventures very far above the horizon after sunset. So as soon as the sun disappears below your horizon, your clock starts ticking. Will you see the glowing point of light that is Mercury before it drops below the horizon, following the setting sun?

Venus is up there, too

Venus – the brightest planet – is also in the evening sky. Venus is much brighter than Mercury. Look for it near Mercury in the western twilight.

Twilight shot with a thin crescent moon, Venus, Mercury, and Regulus.
View at EarthSky Community Photos. | Rita Raina of Rockville, Maryland, captured this image on July 7, 2024, and wrote: “I have never before seen Mercury. Yesterday evening the sky was clear and right below the 2 day old moon was a bright Star. SkyView App said it was Mercury! And to top it, the star visible on the right lower corner, just above the horizon, was Venus, and that the star on the upper left corner was Regulus! A perfect straight line! I think I got lucky again, after a long time though!” Thank you, Rita!
Montage of fiery sunset sky, with bright object sinking lower in each frame: Venus.
View at EarthSky Community Photos. | Peter Lowenstein in Mutare, Zimbabwe, created this montage this week. It’s the brightest planet, Venus, now back in the evening sky. You’ll find it exceedingly low in the sky after sunset, near the sunset glare. This montage shows it setting behind the sun. Peter wrote: “On July 15, I obtained good views of a full Venus, setting behind a tree in fading volcanic sunset glow, shortly after sundown. A full Venus is rare to see, because the planet only appears full from Earth when on the far side of the sun.” Venus has just emerged from being behind the sun. It’ll get higher in the western twilight sky as the weeks pass. How soon will you see it? For more, visit EarthSky’s night sky guide.

Finder charts for October 2024

Venus and Mercury from the Northern Hemisphere in late October.
For Northern Hemisphere viewers, during the last ten evenings of October, Mercury will lie very low in the bright southwestern twilight 30 minutes after sunset. The little planet might be difficult to spot. Bright Venus shines far to its upper left. Chart via EarthSky.
Venus and Mercury in October from southern hemisphere.
For viewers in the Southern Hemisphere, during the second half of October, Mercury climbs slowly in the west 30 minutes after sunset. Bright Venus lies above it. Chart via EarthSky.

For precise sun and Mercury rising times at your location:

Old Farmer’s Almanac (U.S. and Canada)
timeanddate.com (worldwide)
Stellarium (online planetarium program)

Mercury events in 2024

Note: Times are in UTC

Jan 12, 2024: Greatest elongation (morning)
Feb 28, 2024: Superior conjunction (passes behind sun from Earth)
Mar 24, 2024: Greatest elongation (evening)
Apr 11, 2024: Inferior conjunction (races between Earth and sun)
May 9, 2024: Greatest elongation (morning)
Jun 14, 2024: Superior conjunction (passes behind sun from Earth)
Jul 22, 2024: Greatest elongation (evening)
Aug 19, 2024: Inferior conjunction (races between Earth and sun)
Sep 5, 2024: Greatest elongation (morning)
Sep 30, 2024: Superior conjunction (passes behind sun from Earth)
Nov 16, 2024: Greatest elongation (evening)
Dec 5, 2024: Inferior conjunction (races between Earth and sun)
Dec 25, 2024: Greatest elongation (morning)

Heliocentric view of Mercury November 2024

Circle with sun at center, planets around, and zodiac names on outer edge.
Heliocentric view of solar system, November 2024. Chart via Guy Ottewell’s 2024 Astronomical Calendar. Used with permission.

A comparison of elongations

In November 2024, Mercury stretches out a 23 degrees from the sun in our sky. The farthest from the sun that Mercury can ever appear on the sky’s dome is about 28 degrees. And the least distance is around 18 degrees.

Mercury (and Venus) elongations are better or worse depending on the time of the year they occur. So in 2024, the Southern Hemisphere had the best evening elongation of Mercury in July. And the Northern Hemisphere had the best evening apparition in March.

In the autumn for either hemisphere, the ecliptic – or path of the sun, moon and planets – makes a narrow angle to the horizon in the evening. But it makes a steep slant, nearly perpendicular, in the morning. So, in autumn from either hemisphere, morning elongations of Mercury are best. That’s when Mercury appears higher above the horizon and farther from the glow of the sun. However, evening elongations in autumn are harder to see.

In the spring for either hemisphere, the situation reverses. The ecliptic and horizon meet at a sharper angle on spring evenings and a narrower angle on spring mornings. So, in springtime for either hemisphere, evening elongations of Mercury are best. Meanwhile, morning elongations in springtime are harder to see.

Chart with row of steep, alternating light blue and gray arcs, each with a date and height in degrees.
Mercury elongations compared. Here, gray areas represent evening apparitions (eastward elongation). Blue areas represent morning apparitions (westward elongation). The top figures are the maximum elongations, reached at the top dates shown beneath. Curves show the altitude of the planet above the horizon at sunrise or sunset, for latitude 40 degrees north (thick line) and 35 degrees south (thin line). Maxima are reached at the parenthesized dates below (40 degrees north bold). Chart via Guy Ottewell’s 2024 Astronomical Calendar. Used with permission.

More Mercury evening elongation comparisons for 2024

Sky chart with constellations, arc-shaped dotted planet paths, and objects labeled.
Mercury’s greatest evening elongations in 2024 from the Northern Hemisphere as viewed through a powerful telescope. The planet images are at the 1st, 11th, and 21st of each month. Dots show the actual positions of the planet for every day. Chart via Guy Ottewell’s 2024 Astronomical Calendar. Used with permission.
Sky chart with constellations, arc-shaped dotted planet paths, and objects labeled.
Mercury’s greatest evening elongations in 2024 from the Southern Hemisphere as viewed through a powerful telescope. The planet images are at the 1st, 11th, and 21st of each month. Dots show the actual positions of the planet for every day. Chart via Guy Ottewell’s 2024 Astronomical Calendar. Used with permission.

Bottom line: The sun’s innermost planet, Mercury, will lie 23 degrees from the sunset on November 16, 2024.

Submit your photos to EarthSky here.

Read about greatest elongations, superior and inferior conjunctions: Definitions for stargazers

Posted 
November 15, 2024
 in 
Tonight

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