Can you see the Milky Way tonight?

When is Milky Way season?

Milky Way season means core season: the stretch of the year when the galactic centre in Sagittarius is above the horizon while the sky is astronomically dark. From mid-northern latitudes that runs from about February before dawn through to October in the evening, and peaks in June and July. The exact first and last night depend on your latitude, which is what the calendar above computes.

Two things narrow it further. The core has to be high enough to clear the horizon murk, which is why the season feels shorter than the raw rise and set times suggest. And the moon has to be down, which removes roughly ten nights in every twenty-nine regardless of the season.

Can you see the Milky Way tonight?

That depends on tonight's moon, tonight's darkness and where you are standing, so the tool above answers it directly rather than in general terms. The pattern behind the answer is simple enough to carry in your head: if the moon is up and more than about a quarter lit, the answer is no wherever you are. If the moon is down and you are somewhere reasonably dark, the answer is almost always yes, though not always the core.

Can you see the Milky Way with the naked eye?

Yes. The Milky Way is a naked-eye object and always has been. It needs no telescope, no binoculars and no camera. What it needs is a dark sky, a dark-adapted eye and no moon.

What it looks like surprises people. It is not the bright, colourful river of a long-exposure photograph. To the eye it is a soft, grey, slightly mottled band, closer to a thin cloud than to a photo, and the first time most people see it they mistake it for one. The structure comes with time: give your eyes twenty minutes away from any white light and the mottling resolves into star clouds and dark lanes. Averted vision, looking slightly to one side of what you want to see, will pull out more than staring straight at it.

You need roughly Bortle 4 or darker for the core to look like anything, and Bortle 3 or darker before the fainter stretches of the band appear at all. Under a suburban sky the core shows as a vague brightening at best. Binoculars will not fix a bright sky, but under a dark one they turn the Scutum and Sagittarius star clouds into fields of individual stars, which is worth doing at least once.

What is the Milky Way core?

The Milky Way is a full circle around the sky. We sit inside a flat disc of a few hundred billion stars, so wherever you look along the plane of that disc you are looking through the most stars, and that is the band. It never goes away. Half of it is above your horizon at any moment of any night of the year.

The core is one stretch of that circle: the direction of the galactic centre. It sits at right ascension 17h 45m, declination −29°, in Sagittarius on the border of Scorpius, and what you are seeing is the central bulge of the galaxy, about 26,000 light years away, viewed through the entire thickness of the disc in between. That is why it is brighter, wider and more obviously structured than anywhere else, with dust lanes cutting across it and star clouds standing out inside it. On this page the core means roughly 25 degrees of band either side of the galactic centre, which is the part that photographs the way people expect.

Can you see the Milky Way in winter?

Yes, and this is the single most common misconception about it. The core is gone from northern winter skies, so most guides say the season is over and stop there. The band is not gone. It has rotated, and a different part of it is overhead.

The winter Milky Way runs from Cassiopeia through Perseus and Auriga down past Orion into Monoceros and Canis Major. It is fainter than the summer side, because you are looking outward, away from the galactic centre, rather than through the crowded middle of the galaxy. But it is genuinely there, it is up all night in December and January, and Cassiopeia is circumpolar from most of the northern United States, meaning it never sets at all. Winter also brings the longest nights and the steadiest, driest air of the year. Switch the calendar above to any bright stretch and December stops being empty.

What constellations is the Milky Way in?

The band passes through more than twenty constellations on its way around the sky. These are the stretches bright enough to be worth planning a night around, in order along the band starting at the centre.

Brightness is relative, with the core set to 1.00. These are our own working values for ranking what is worth your night, not photometry.

Why winter can beat midsummer on that chart

Switch the calendar to any bright stretch and December often glows brighter than June, which looks wrong until you count the hours. The chart plots hours, not quality. From Tucson on a moonless night in mid-June there are 6 hours 23 minutes of astronomical darkness with the moon down, and that is the ceiling no matter how good the core looks. On a moonless night in early December there are 10 hours 58 minutes, and Cassiopeia is above 15 degrees for nearly 10 of them.

So December really does offer more Milky Way, in the sense of more hours with something worth looking at overhead. It offers a fainter Milky Way. Those are different questions and the two modes answer them separately: use just the core when the core is the thing you came for, and any bright stretch when you want to know whether tonight is worth going out at all. Hovering a night tells you which stretch is carrying it.

The band does not set when the core does

From 40 degrees north the core is gone from the evening sky by October and does not come back until spring. In those same months Cygnus sits nearly overhead at nightfall, and Cygnus is the brightest stretch of the Milky Way visible from mid-northern latitudes after the core itself. The Great Rift runs straight through it, the North America Nebula is in it, and on a good night it is a genuinely spectacular piece of sky.

The row of thumbnails at the top of this page is that argument made concrete. It lists every bright stretch that clears 15 degrees in a dark, moonless sky on the night you have chosen, ranked, with the hours for each. On a lot of nights the core is missing from that row and there are still three good entries in it.

The three windows that have to overlap

Everything on this page comes from intersecting three things, and any one of them can ruin a night. One, the stretch you want is above the horizon and high enough to matter. Two, the sky is astronomically dark, meaning the sun is more than 18 degrees below the horizon. Three, the moon is down. The timeline under the sky view draws all three: the strip fades from twilight to black, the pale wash is moonlight, and the bar underneath is your target, solid where all three line up.

Best time of night to see the Milky Way

Whenever your target is highest inside that overlap, which the tool marks for you. As a rule of thumb, in core season the core is highest around 1am in May, midnight in June, and 10pm in August, drifting about two hours earlier each month. That drift is not the moon or the season, it is the Earth going round the sun: any fixed point in the sky rises about four minutes earlier each night, which adds up to two hours a month.

How high is high enough

Two numbers, because two different things are being asked. Naked eye and casual looking: 15 degrees. Below that you are looking through five or six times as much atmosphere as you are overhead, and the band dissolves into the horizon glow no matter how dark your site is. Camera work: 25 degrees and up, because extinction and the horizon light dome both fall off fast, and a core at 30 degrees is a dramatically cleaner frame than the same core at 18. Both lines are drawn on the sky view.

Your latitude sets a hard ceiling. The core never rises higher than about 61 degrees minus your latitude.

That is not a failure of your site or your gear. It is geometry, and it is the single best argument for driving south for a core trip.

What is the Great Rift?

The dark lane splitting the band from Cygnus down through Aquila to Sagittarius. It is not a gap in the Milky Way and not an absence of stars. It is dust: cold molecular clouds in our own spiral arm, sitting in front of everything and blocking the light of the stars behind. Once you know that, the band stops looking flat and starts looking like something with depth, which is much closer to the truth. The part running through Cygnus is sometimes called the Cygnus Rift or the Northern Coalsack.

What the moon does to all this

More than most people expect. A full moon does not merely brighten the sky, it raises the background enough that the band's contrast against it collapses, and the Milky Way is a low-contrast object. A quarter moon low in the sky is survivable. A gibbous moon anywhere is not. This is why the heatmap has that regular striped rhythm running through it: those are the lunar months, and the pale bands are the weeks around new moon. If you are planning one trip a month, plan it there.

The Milky Way from the southern hemisphere

Better, and it is not close. Southern observers get the core passing near the zenith rather than skulking along the horizon, which is the difference between a glow and a spectacle. They also get the two brightest stretches that northern latitudes never see at all: Carina, which holds the naked-eye Carina Nebula, and Crux and Centaurus, with the Southern Cross, the Coalsack dark nebula and Alpha and Beta Centauri. Enter a southern location above and those stretches appear in the row with everything else. From 32 degrees north they are flagged as permanently out of reach, because they are.

Find the dark skies near you

Every number on this page assumes the only things between you and the galaxy are air and moonlight. Add a city to the west and the whole calculation changes, because the band is a large, faint, low-contrast thing and light pollution takes it first. The core will punch through a suburban sky as a vague glow. The rest of the band will not show at all.

Learn how to find dark skies near you

How this tool works

Positions are computed in your browser and nothing is sent anywhere. Each stretch of the band is anchored at its galactic longitude on the galactic equator, converted to J2000 equatorial coordinates and precessed to the date; the conversion was checked against known values (Deneb at l 84.3, b +2.0 and Antares at l 352.0, b +15.1). Sun and moon come from the same engine as our other tools, verified against pyephem to within 35 arcseconds of position and 30 seconds of rise and set time. Rise and set assume a flat, open horizon and standard refraction, so a ridge to your south will cost you core time that this page cannot know about. Relative brightness values for each stretch are our own judgement, not photometry, and they are used only for ranking. The Milky Way you see in the sky view is not an illustration. It is NASA's Deep Star Maps 2020 all-sky image, built from the European Space Agency's Gaia star survey, mapped pixel by pixel from galactic coordinates onto your sky for the time and place you pick, so the star clouds, the dust lanes and the Great Rift sit exactly where they really are. Image credit: NASA/Goddard Space Flight Center Scientific Visualization Studio; Gaia DR2: ESA/Gaia/DPAC.