Moon Calendar — September 2021
The Moon's zodiac sign for every day of September 2021, with sign-change times and all four phases — computed from real planetary positions. Times are UTC.
The Moon in September 2021
In September 2021 the Moon changes zodiac sign 13 times and passes through all 12 signs. It starts the month in Cancer on September 1 and ends it in Cancer on September 30. Counting the sign it occupies at noon UTC each day, it spends the most days in Cancer (5 days), Capricorn (3 days) and Aries (3 days).
The main lunar phases this month are: New Moon on September 7 in Virgo, First Quarter on September 13 in Sagittarius, Full Moon on September 20 in Pisces and Last Quarter on September 29 in Cancer.
For context: the Moon circles the zodiac in about 27.3 days, so it usually stays in one sign for roughly 2 to 2.5 days before moving on. Its phases follow the longer synodic month of about 29.5 days — the time from one new moon to the next — which is why each phase lands on a different date every month. All times here are UTC, so a sign change or phase near midnight may fall on the neighboring date in your time zone.
Phases in September 2021
Moon sign by day
| Date | Moon in | Sign change (UTC) |
|---|---|---|
| Wed, Sep 1 | Cancer | Gemini → Cancer ~6:00 |
| Thu, Sep 2 | Cancer | — |
| Fri, Sep 3 | Cancer | Cancer → Leo ~16:00 |
| Sat, Sep 4 | Leo | — |
| Sun, Sep 5 | Leo | Leo → Virgo ~23:00 |
| Mon, Sep 6 | Virgo | — |
| Tue, Sep 7 | Virgo | — |
| Wed, Sep 8 | Libra | Virgo → Libra ~4:00 |
| Thu, Sep 9 | Libra | — |
| Fri, Sep 10 | Scorpio | Libra → Scorpio ~7:00 |
| Sat, Sep 11 | Scorpio | — |
| Sun, Sep 12 | Sagittarius | Scorpio → Sagittarius ~9:00 |
| Mon, Sep 13 | Sagittarius | — |
| Tue, Sep 14 | Capricorn | Sagittarius → Capricorn ~12:00 |
| Wed, Sep 15 | Capricorn | — |
| Thu, Sep 16 | Capricorn | Capricorn → Aquarius ~16:00 |
| Fri, Sep 17 | Aquarius | — |
| Sat, Sep 18 | Aquarius | Aquarius → Pisces ~21:00 |
| Sun, Sep 19 | Pisces | — |
| Mon, Sep 20 | Pisces | — |
| Tue, Sep 21 | Aries | Pisces → Aries ~4:00 |
| Wed, Sep 22 | Aries | — |
| Thu, Sep 23 | Aries | Aries → Taurus ~13:00 |
| Fri, Sep 24 | Taurus | — |
| Sat, Sep 25 | Taurus | — |
| Sun, Sep 26 | Gemini | Taurus → Gemini ~1:00 |
| Mon, Sep 27 | Gemini | — |
| Tue, Sep 28 | Gemini | Gemini → Cancer ~14:00 |
| Wed, Sep 29 | Cancer | — |
| Thu, Sep 30 | Cancer | — |