Waning Crescent Moon: What It Is and When to See It This Week - Tempo.co English

TEMPO.CO, Jakarta - The waning crescent Moon is visible in the early morning sky this week, from September 7 through September 10, 2026, as the Moon approaches the end of its monthly cycle.

The Moon is gradually becoming thinner after passing the Third Quarter phase on September 4. It will continue to lose its illuminated portion until reaching the New Moon phase late Thursday, September 10, at 11:27 p.m. EDT in the United States.

The waning crescent is more than a familiar curved shape in the sky. Its changing appearance offers a visible look at how the Moon moves through its roughly 29.5-day cycle.

The waning crescent is the final phase of the Moon before the New Moon. It begins after the Third Quarter and lasts until the Moon becomes completely unilluminated from Earth's perspective.

During this phase, the visible illuminated portion shrinks from about 50 percent toward zero. The term “waning” refers to the decreasing illumination, while “crescent” describes the Moon's thin, curved shape.

Unlike the Full Moon, which is visible for much of the night, the waning crescent is primarily a morning Moon. It generally rises after midnight and can remain visible into the morning before setting in the afternoon.

For skywatchers in the United States, the waning crescent is visible during the early morning hours from September 7 through September 10, weather permitting.

Look toward the eastern sky before sunrise. The Moon will appear increasingly thin as it moves closer to the Sun in the sky. Because its rising and setting times vary by location, the exact viewing window will differ between U.S. cities.

On September 8, the crescent Moon will also appear close to Jupiter, creating a notable pairing in the early morning sky.

The best viewing conditions generally occur before sunrise, when the sky is still dark enough to make the increasingly faint crescent easier to see.

The Moon appears to shrink during the waning crescent phase because of its changing position relative to Earth and the Sun.

Half of the Moon remains illuminated by sunlight, but from Earth, we gradually see less of that sunlit half as the Moon moves toward the New Moon.

By the final days of the phase, only a narrow sliver is illuminated. At the New Moon, the side of the Moon facing Earth is largely unlit, making it difficult to see.

The September New Moon occurs at 11:27 p.m. EDT on September 10, according to astronomical calculations. Because of time-zone differences, it falls on September 11 in parts of the world.

A thin waning crescent can sometimes reveal another striking feature: earthshine.

Even when only a small crescent is brightly illuminated, the rest of the Moon's disk may appear faintly visible. This happens when sunlight reflected from Earth illuminates the darker portion of the Moon.

The effect is sometimes called the Da Vinci glow. It is easiest to notice when the crescent is very thin and the sky is still relatively dark.

The Moon is in the same phase worldwide at any given moment. The percentage of its surface illuminated by the Sun does not change depending on where someone is observing it.

However, the orientation of the crescent can look different.

The curve may appear tilted differently depending on the observer's latitude, the time of day and the Moon's position in the sky. This is why the crescent can appear to have a different orientation to observers in the Northern and Southern hemispheres.

The boundary separating the Moon's illuminated and dark portions is called the terminator.

The waning crescent is the final visible phase before the New Moon, after which the lunar cycle begins again.

The sequence moves from the New Moon to the waxing crescent, First Quarter, waxing gibbous and Full Moon. The illuminated portion then decreases through the waning gibbous phase, Third Quarter and finally the waning crescent.

After the New Moon, a thin waxing crescent Moon will gradually become visible again in the evening sky.

For skywatchers, following the Moon across several days offers a simple way to observe this cycle in real time, from a broad half-lit disk after the Third Quarter to a slender crescent just before the Moon disappears from view.

*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" dir="auto" data-turn-id="request-6a6c680a-51e4-83ec-b85a-76f2b465166c-94" data-turn-id-container="request-6a6c680a-51e4-83ec-b85a-76f2b465166c-94" data-testid="conversation-turn-192" data-turn="assistant">Read: Venus to Vanish Behind Moon on Sept. 14: What to Know