Moon calendar, September 2031
Tropical zodiac · geocentric, apparent positions · Swiss Ephemeris, checked against NASA JPL DE440 · void of course: last exact conjunction, sextile, square, trine or opposition to the Sun and Mercury to Pluto · times in UTC
Full Moon on 1 September at 09:20, in Pisces. New Moon on 16 September at 18:46, in Virgo. Full Moon on 30 September at 18:57, in Aries.
The Moon changes sign 13 times this month and is void of course before each change.
| Date | Moon sign | Phase | Void of course |
|---|---|---|---|
| Mon 1 | Pisces | Full Moon at 09:20 | |
| Tue 2 | Pisces, enters Aries at 20:28 | 15:12 to 20:28 | |
| Wed 3 | Aries | ||
| Thu 4 | Aries | from 19:13 | |
| Fri 5 | Aries, enters Taurus at 00:46 | until 00:46 | |
| Sat 6 | Taurus | ||
| Sun 7 | Taurus, enters Gemini at 09:05 | 08:56 to 09:05 | |
| Mon 8 | Gemini | Last quarter at 16:14 | |
| Tue 9 | Gemini, enters Cancer at 20:42 | 14:42 to 20:42 | |
| Wed 10 | Cancer | ||
| Thu 11 | Cancer | from 10:11 | |
| Fri 12 | Cancer, enters Leo at 09:27 | until 09:27 | |
| Sat 13 | Leo | ||
| Sun 14 | Leo, enters Virgo at 21:06 | 15:27 to 21:06 | |
| Mon 15 | Virgo | ||
| Tue 16 | Virgo | New Moon at 18:46 | |
| Wed 17 | Virgo, enters Libra at 06:40 | 01:17 to 06:40 | |
| Thu 18 | Libra | ||
| Fri 19 | Libra, enters Scorpio at 14:10 | 09:02 to 14:10 | |
| Sat 20 | Scorpio | ||
| Sun 21 | Scorpio, enters Sagittarius at 19:53 | 17:18 to 19:53 | |
| Mon 22 | Sagittarius | ||
| Tue 23 | Sagittarius, enters Capricorn at 23:55 | 19:11 to 23:55 | |
| Wed 24 | Capricorn | First quarter at 01:19 | |
| Thu 25 | Capricorn | from 00:36 | |
| Fri 26 | Capricorn, enters Aquarius at 02:27 | until 02:27 | |
| Sat 27 | Aquarius | from 23:36 | |
| Sun 28 | Aquarius, enters Pisces at 04:09 | until 04:09 | |
| Mon 29 | Pisces | ||
| Tue 30 | Pisces, enters Aries at 06:18 | Full Moon at 18:57 | 01:40 to 06:18 |
Go deeper: phases, signs and void of course
Phases. New Moon is the moment the Moon passes the Sun in longitude; first quarter, full and last quarter are 90°, 180° and 270° past it. Each happens at one instant worldwide; only the clock time differs by place.
Signs. The Moon crosses a sign in about two and a half days. These are tropical signs; in a sidereal (Vedic) zodiac the Moon reaches each sign about 24° later, nearly two days after the times shown.
Void of course. From the Moon’s last exact major aspect in a sign until it enters the next sign. William Lilly, in the 17th century, counted only the Sun and the five visible planets; most modern calendars add Uranus, Neptune and Pluto, so their void periods are often shorter. Switch between the two above.