Tonight’s sky is showing off a waxing crescent Moon, and NASA’s trackers know exactly what it looks like. On Thursday, Sept. 17, 2026, the Moon is in its Waxing Crescent phase, with 35% of its surface visible. That means the Moon’s sunlit side is growing bigger with each passing night, and there is plenty to see if you know where to look.
The Moon’s appearance changes from night to night because it travels around Earth, completing one orbit in about 29.5 days. That journey determines what we see, with the Moon moving through eight distinct phases as it goes. Tonight, we sit at day six of the lunar cycle, which puts us well into the Waxing Crescent stage.
What the Waxing Crescent Looks Like
In the Waxing Crescent phase, a small sliver of light appears on the right side of the Moon, at least as seen from the Northern Hemisphere. That crescent grows larger each night until the Moon reaches its fullest form.
The Moon is not between Earth and the Sun during this phase, unlike the New Moon. Instead, it sits at a position where only a portion of its sunlit side faces us, giving us that thin crescent shape. The Moon’s position relative to both Earth and the Sun determines exactly what we see, and NASA’s trackers keep a daily record of where the Moon stands in that cycle.
What You Can See Without a Telescope
The naked eye has its limits, but the Moon is generous even within them. Tonight, you should be able to spot Mare Crisium and Mare Fecunditatis with the unaided eye. These are two mare features on the Moon’s surface.
Mare Crisium is one of the Moon’s maria, and Mare Fecunditatis is another mare. Together they mark distinct regions that are easy to pick out once you know where to look. Both are visible to the naked eye.
For a closer look, binoculars offer a simple upgrade. They reveal more detail than the eye alone, and they bring Endymion Crater into view. This crater is a notable feature on the Moon’s surface, and binoculars provide enough magnification to show its shape clearly.
A telescope helps you see all of these features more distinctly, along with additional details. With a telescope, you can spot the Apollo 11 and 17 landing sites. Those sites hold a special place in the history of space exploration, and seeing them on the Moon’s surface adds a layer of meaning to the evening’s observation.
The Eight Phases of the Moon
The lunar phases follow a familiar pattern, and NASA’s guide lays them out clearly. The cycle starts at New Moon, when the Moon is between Earth and the Sun and its illuminated side faces away from us, making it invisible to the naked eye.
From there, the Moon moves through the Waxing Crescent phase, where we see that thin sliver of light. The crescent grows larger each night until it reaches First Quarter, when half of the Moon is lit on the right side. That half-Moon shape is a familiar sight to anyone who watches the night sky regularly.
After First Quarter comes the Waxing Gibbous phase, where more than half of the Moon is lit up but it is not quite full yet. The Moon continues to grow until it reaches Full Moon, when the whole face of the Moon is illuminated and fully visible.
The cycle then reverses. The Waning Gibbous phase shows the Moon losing light on the right side, followed by Third Quarter, which is another half-Moon but with the left side lit. Finally, the Waning Crescent phase brings the Moon back to a thin sliver of light on the left side before it disappears again at New Moon.
The Next Full Moon
If you miss tonight’s Waxing Crescent, there is another lunar event coming soon. The next Full Moon will take place on September 26. That date gives observers a clear target for the next major lunar phase.
Between now and then, the Moon will pass through the remaining phases of its cycle. Each night brings a slightly fuller appearance until the Moon reaches its fullest form on the 26th.
What You Need to Know About Tonight’s Sky
The key facts are straightforward. Tonight is day six of the lunar cycle, the Moon is in the Waxing Crescent phase with 35% of its surface visible, and the visibility depends on clear skies.
The Moon’s position in the sky changes throughout the night, so the best time to look depends on where you are. The visibility of the Moon can also depend on weather and light pollution, so a clear, dark location is ideal.
A Guide to the Lunar Landmarks
For those who want to point their binoculars or telescope at specific targets, the Moon’s surface is rich with named features. Mare Crisium and Mare Fecunditatis are the two mare features visible to the naked eye, and they are easy to identify once you know what to look for.
Endymion Crater is a notable impact feature, and it shows up clearly with binoculars. The Apollo 11 and 17 landing sites are also visible with a telescope, though they require careful aiming and patience to spot.
Here is a quick rundown of what you can see at each level of equipment:
- Naked eye: Mare Crisium, Mare Fecunditatis
- Binoculars: Endymion Crater, the mare features
- Telescope: Apollo 11 and 17 landing sites, plus the mare features
Each step up in magnification reveals more, but the base observations are the simplest to make. Start with the naked eye, move to binoculars if you have them, and save the telescope for the most detailed work.
The Science Behind the Phases
The lunar phases are a natural consequence of the Moon’s motion around Earth. As the Moon orbits, its position relative to the Sun changes, and that change determines how much of its sunlit side we see from Earth.
The phases repeat in a fixed order because the Moon’s orbital period is consistent. The 29.5-day cycle is a fundamental property of the Moon-Earth system, and it has been observed for millennia.
Modern trackers like NASA’s Daily Moon Guide use precise measurements to determine exactly where the Moon stands in that cycle on any given night. The information is freely available, and it makes it easy for anyone to know what to expect when they step outside.
The phases are not a mystery. They are a predictable pattern, and the tools we have today make it easy to track them with precision.
What to Look For Tonight
The best advice for tonight is simple: look up. The Moon is in a favorable phase, and the crescent shape is easy to spot even in a crowded sky. The mare features are large enough to see without magnification, and the other targets are within reach of common observing equipment.
The Waxing Crescent phase is a good time to start learning the Moon’s surface. Each night brings a new view, and the cycle repeats predictably enough that you can plan your observations weeks in advance.
The Full Moon on September 26 will be the next major event, and it is worth marking on your calendar. The Moon’s phases are a constant presence in the night sky, and they offer a simple way to connect with the rhythms of the natural world.
For anyone who has never looked at the Moon through binoculars or a telescope, tonight is a good time to start. The equipment is cheap, the targets are obvious, and the results are immediate. A few minutes of looking up can change how you see the sky, and the Moon is always there to show you what it has to offer.
The Moon’s phases are a gift to anyone who cares to watch. They are simple, predictable, and endlessly rewarding. Tonight’s Waxing Crescent is just one step in a long cycle, but it is a step worth taking.
Tonight, the Moon is a sliver in the sky. By September 26, it will be full. That is the rhythm of the night, and it is worth paying attention to.
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