Moon phases in September 2021
All 30 days, computed from the ephemeris rather than copied from another calendar: the Moon’s sign, the exact instant it changes sign, and the lit fraction of the disc. Shown in your own timezone.
- New MoonSeptember 714.6° Virgo
- Harvest MoonSeptember 2028.2° Pisces
Day by day
The four quarter instants are marked on the day they fall; every other day carries the interval it is in. Four of the eight phases are moments and four are stretches, which is the one thing most calendars leave out.
| Date | Phase | Sign | Illumination | Notes | |
|---|---|---|---|---|---|
| Wed 1 | Waning Crescent | Gemini→Cancer | 30% | ||
| Thu 2 | Waning Crescent | Cancer | 21% | ||
| Fri 3 | Waning Crescent | Cancer→Leo | 14% | ||
| Sat 4 | Waning Crescent | Leo | 7% | ||
| Sun 5 | Waning Crescent | Leo→Virgo | 3% | ||
| Mon 6 | Waning Crescent | Virgo | 0% | ||
| Tue 7 | New Moon | Virgo | 0% | ||
| Wed 8 | Waxing Crescent | Virgo→Libra | 3% | ||
| Thu 9 | Waxing Crescent | Libra | 8% | ||
| Fri 10 | Waxing Crescent | Libra→Scorpio | 15% | ||
| Sat 11 | Waxing Crescent | Scorpio | 24% | ||
| Sun 12 | Waxing Crescent | Scorpio→Sagittarius | 35% | ||
| Mon 13 | First Quarter | Sagittarius | 46% | ||
| Tue 14 | Waxing Gibbous | Sagittarius→Capricorn | 57% | ||
| Wed 15 | Waxing Gibbous | Capricorn | 68% | ||
| Thu 16 | Waxing Gibbous | Capricorn→Aquarius | 78% | ||
| Fri 17 | Waxing Gibbous | Aquarius | 87% | ||
| Sat 18 | Waxing Gibbous | Aquarius→Pisces | 93% | ||
| Sun 19 | Waxing Gibbous | Pisces | 98% | ||
| Mon 20 | Full Moon | Pisces | 100% | ||
| Tue 21 | Waning Gibbous | Pisces→Aries | 100% | ||
| Wed 22 | Waning Gibbous | Aries | 98% | ||
| Thu 23 | Waning Gibbous | Aries→Taurus | 94% | ||
| Fri 24 | Waning Gibbous | Taurus | 88% | ||
| Sat 25 | Waning Gibbous | Taurus | 81% | ||
| Sun 26 | Waning Gibbous | Taurus→Gemini | 73% | ||
| Mon 27 | Waning Gibbous | Gemini | 65% | ||
| Tue 28 | Waning Gibbous | Gemini→Cancer | 56% | ||
| Wed 29 | Last Quarter | Cancer | 46% | ||
| Thu 30 | Waning Crescent | Cancer | 36% | ||
Rows are UTC calendar days. The exact times follow the timezone setting above, so a time close to midnight can belong to the neighbouring day in your own zone.
- 1
- Full moons
- 1
- New moons
- 13
- Sign changes
- 100%
- Brightest night
The Moon passes through 13 signs this month, in order: Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces, Aries, Taurus, Gemini, Cancer. It changes sign 13 times — roughly every two and a third days, though not evenly, because the Moon’s speed varies about twelve per cent over an orbit.
This month’s full moon is the Harvest Moon
The Harvest Moon is the full moon falling nearest the September equinox — a rule about the sky, not a slot in a month table. That is why it moves between September and October from year to year, and why a calendar that reads the name off a fixed twelve-row list gets it wrong in the years it lands in October.
Frequently asked questions
When is the full moon in September 2021?
There are 1 in September 2021. The exact instants are in the table above, shown in your own timezone, with the degree and sign each one falls on.
When is the new moon in September 2021?
There are 1 in September 2021, listed to the minute in the table above along with every other phase of the month.
What timezone are these times in?
Your own, resolved in your browser. The rows are UTC calendar days, so an instant close to midnight can belong to the neighbouring day once converted — the table marks those with a small +1 or −1. You can switch the whole page to UTC if you want to compare it against a site that publishes UTC.
What sign is the Moon in during September 2021?
It moves through 13 of them, changing sign 13 times. The exact instant of each change is in the sign column above. The Moon spends about two and a third days in a sign, which is why it covers the whole zodiac in a month while the Sun takes a year.