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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The Moon was in its New Moon phase on September 21, 2025. The U.S. Naval Observatory lists the phase event at 19:54 UTC. Around this phase, the Moon appeared dark or was difficult to see because its sunlit side faced mostly away from Earth.
What the Moon looked like on September 21, 2025
At New Moon, the Moon is near the Sun in the sky, and the side illuminated by sunlight faces away from Earth. The near side is therefore dark to us; the Moon has not disappeared. NASA explains that a new Moon generally rises and sets with the Sun and is usually not visible in the daytime sky. NASA’s Moon phases guide
The exact appearance depended on the observer’s location and the time relative to the phase event. The date alone does not establish a universal viewing time, and a visible crescent should not be assumed for September 21 itself.
When the New Moon occurred
The U.S. Naval Observatory’s 2025 phase data lists the New Moon for September 21 at 19:54 UTC. That is the event time in Universal Time, not a local clock time shared by every observer. Depending on time zone, the event could fall at a different local hour or even on a different local calendar date. USNO Moon phases for 2025
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Why the phase changes
The Moon does not make its own light: sunlight illuminates half of it, and the phase we see depends on how much of that sunlit half is visible from Earth. The phases progress continuously through eight commonly named stages:
- New Moon
- Waxing crescent
- First quarter
- Waxing gibbous
- Full Moon
- Waning gibbous
- Third quarter, also called last quarter
- Waning crescent
After New Moon, the waxing crescent develops as a thin sliver that grows from day to day. NASA gives the interval from one New Moon to the next as about 29.5 days. NASA’s Moon phases guide
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How to check local Moon times
Moonrise and moonset are specific to a date and location, so there is no single worldwide timetable for September 21, 2025. The USNO’s one-day service calculates phase and illuminated fraction for noon in the requested time zone, while rise and set calculations require a location. USNO Complete Sun and Moon Data for One Day
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