Venus Shines Brightest Tonight, Magnitude -4.8
On September 18, Venus reaches the peak brightness of this evening apparition, magnitude -4.8. Look low above the western horizon right after sunset, though sources disagree on the exact peak time.
Venus today, September 18, 2026, reaches its peak brightness in this evening apparition. According to EarthSky, the planet hits that peak at 23:00 UTC, which in Serbia is one hour past midnight on September 19. By then Venus has already set below the horizon there, so in practice the display is best watched tonight, right after sunset, while the planet is still high enough to see.
Astronomy magazine gives a different time for the same day, 21:00 Eastern Daylight Time, which converts to just after midnight between September 18 and 19 UTC, about two hours later than EarthSky’s figure. NASA’s monthly sky guide for September simply says Venus reaches peak brightness on September 18, without naming an exact hour. All three sources agree on the number describing the brightness itself, magnitude -4.8; the disagreement is only over the moment when that peak is mathematically calculated.
After the Sun and the Moon, Venus is the third brightest object in the sky, EarthSky notes. A magnitude of -4.8 means the planet is far brighter than any star in the sky, including Sirius, otherwise the brightest star in the night sky. NASA says observers will not need to search hard: the planet stands out as a blazing point of light low above the western horizon and easily outshines every star around it, so it is enough to look with the naked eye low above the western and southwestern horizon right after sunset.
According to Astronomy’s weekly sky guide, twenty minutes after sunset Venus sits about 7 degrees above the southwestern horizon, in the southeastern part of the constellation Virgo, having pulled well away from the star Spica by now. It sets roughly 70 minutes after the Sun, so observing it requires a clear view of the horizon, free of buildings and trees that could block it. That 70 minute figure applies to the latitude the American magazine writes for, so the exact setting time in Serbia may differ somewhat.
Through a telescope, Venus now looks like a narrow crescent. Astronomy puts the disk at about 39 arcseconds across and roughly 25 percent illuminated, while EarthSky describes a disk of about 40 arcseconds without giving a precise illumination figure. That combination, a relatively large apparent diameter paired with a narrow illuminated crescent, is what gives Venus its peak brightness at this stage of its orbit around the Sun, EarthSky explains.
Peak brightness occurs roughly five weeks before and after inferior conjunction, the moment when Venus passes between Earth and the Sun on its orbit. That conjunction is set for October 23 and 24, 2026, after which the planet moves from the evening sky to the morning sky. Venus will next reach peak brightness in the morning sky on November 29, 2026, while it will not shine this brightly in the evening sky again until April 2028, EarthSky reports.
What else is happening in the sky this week
The same day carries other events too. The Moon reaches its first quarter at 4:44 p.m. Eastern Daylight Time, or 10:44 p.m. in Serbia, Astronomy writes. A little later, at 11:00 p.m. Eastern time, which is 5:00 a.m. on September 19 in Serbia, the Moon passes through apogee, the farthest point of its orbit from Earth, at 251,171 miles, or about 404,000 kilometers.
Tomorrow, September 19, marks International Observe the Moon Night, NASA notes, when amateur astronomy clubs around the world invite people to look up and learn more about the Moon. Three days later, on September 22, the equinox arrives, and astronomical autumn begins in the Northern Hemisphere while spring begins in the Southern Hemisphere.
Two concepts are easy to mix up here, so they are worth telling apart. Venus’s peak brightness is not the same as its closest approach to Earth or its largest apparent disk diameter, those occur at a different stage of the orbit. Peak brightness comes from the combination of how much of the disk is illuminated and its total apparent size at a given moment, which is exactly why that peak lines up with neither inferior conjunction nor Venus’s greatest elongation from the Sun. The moment of the mathematical peak itself, as the gap between EarthSky and Astronomy shows, comes down to differing calculations, so the practical advice for observers stays the same: look at the western sky right after sunset over the next few evenings, while the day to day difference in brightness is still negligible.
