Moon calendar · calculated, not copied
Moon Calendar for December 2025
Every phase of December 2025 day by day, with the exact moment of each new and full moon, the sign the Moon is travelling through, and the void-of-course windows in between.
🕓 Times shown in UTC. We calculate in UTC; your browser converts.
New moon and full moon in December 2025
- Full Moon in Gemini
- New Moon in Sagittarius
Moon phases day by day
Each row is read at 12:00 UTC on that date — a calendar day has one icon, but the Moon moves through it, so a day near a phase change can read either way by a few hours. 16 of 31 days carry a void-of-course window; they are marked in the last column and listed in full below.
| Day | Phase | Lit | Moon in | Void |
|---|---|---|---|---|
| 1 Mon | Waxing Gibbous | 83% | Aries | void |
| 2 Tue | Waxing Gibbous | 91% | Taurus | void |
| 3 Wed | Full Moon | 97% | Taurus | — |
| 4 Thu | Full Moon | 99% | Gemini | void |
| 5 Fri | Full Moon | 99% | Gemini | — |
| 6 Sat | Full Moon | 96% | Cancer | void |
| 7 Sun | Waning Gibbous | 91% | Cancer | — |
| 8 Mon | Waning Gibbous | 83% | Leo | void |
| 9 Tue | Waning Gibbous | 74% | Leo | — |
| 10 Wed | Last Quarter | 64% | Virgo | void |
| 11 Thu | Last Quarter | 54% | Virgo | — |
| 12 Fri | Last Quarter | 44% | Virgo | void |
| 13 Sat | Last Quarter | 34% | Libra | — |
| 14 Sun | Waning Crescent | 26% | Libra | — |
| 15 Mon | Waning Crescent | 18% | Scorpio | void |
| 16 Tue | Waning Crescent | 11% | Scorpio | — |
| 17 Wed | Waning Crescent | 6% | Scorpio | void |
| 18 Thu | New Moon | 2% | Sagittarius | — |
| 19 Fri | New Moon | 0% | Sagittarius | — |
| 20 Sat | New Moon | 0% | Capricorn | void |
| 21 Sun | New Moon | 2% | Capricorn | — |
| 22 Mon | Waxing Crescent | 6% | Capricorn | void |
| 23 Tue | Waxing Crescent | 11% | Aquarius | — |
| 24 Wed | Waxing Crescent | 18% | Aquarius | void |
| 25 Thu | Waxing Crescent | 27% | Pisces | void |
| 26 Fri | First Quarter | 36% | Pisces | — |
| 27 Sat | First Quarter | 47% | Aries | void |
| 28 Sun | First Quarter | 58% | Aries | — |
| 29 Mon | First Quarter | 69% | Taurus | void |
| 30 Tue | Waxing Gibbous | 79% | Taurus | — |
| 31 Wed | Waxing Gibbous | 88% | Taurus | void |
Void of course Moon in December 2025
Each window runs from the Moon's last exact aspect to a planet until it crosses into the next sign. Check the Moon right now if that is the question you actually came with.
| From | Until | Moon in | Last aspect |
|---|---|---|---|
| Aries | Moon square Jupiter | ||
| Taurus | Moon sextile Neptune | ||
| Gemini | Moon square Neptune | ||
| Cancer | Moon sextile Neptune | ||
| Leo | Moon square Uranus | ||
| Virgo | Moon conjunction Neptune | ||
| Libra | Moon sextile Mars | ||
| Scorpio | Moon sextile Neptune | ||
| Sagittarius | Moon square Neptune | ||
| Capricorn | Moon sextile Neptune | ||
| Aquarius | Moon square Uranus | ||
| Pisces | Moon conjunction Neptune | ||
| Aries | Moon sextile Mercury | ||
| Taurus | Moon sextile Neptune |
How to read this month
A lunar month is about 29.5 days, so it never lines up with a calendar month. That is why December 2025 can hold two new moons or none at all, and why the same phase name covers several days in a row: the eight names — new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter, waning crescent — are 45-degree slices of the Sun–Moon angle, not instants. The two moments that are instants, the new moon and the full moon, are listed at the top of the page to the minute.
The Moon in column is the zodiac sign the Moon is crossing, which it changes roughly every two and a half days — a different thing from your own Moon sign, which is fixed at birth. The void column marks the stretch between the Moon's last exact aspect and its next sign change. In traditional practice that is a window for finishing and resting rather than launching; it describes timing, not outcomes, and nothing on this page predicts events.
Where the numbers come from
Positions are computed with astronomy-engine, the same engine behind our birth chart calculator, checked against Swiss Ephemeris to within a fraction of an arc minute. The new and full moon moments were verified against AstroPixels (Fred Espenak, NASA/GSFC) and agree to better than two minutes. If you want a month to the second, cross-check a dedicated astronomy source such as timeanddate.com.
Take it further
This calendar is the sky. The tools below put it against your own chart — all free, no sign-up.
- Moon Phase by Birthday The phase the Moon was in on the day you were born, and what it says about your timing.
- Void of Course Moon Checker Is the Moon void right now? Check today before you sign, launch or decide.
- Moon Sign Calculator The sign your natal Moon sits in — the one behind how you actually feel things.
- Eclipse Tracker Every solar and lunar eclipse through 2028, with the exact moment of maximum.
Lunar guide collection
Moon Rituals & Lunar Living
The lunar cycle explained, plus simple rituals for the new moon, the full moon and eclipse season.
Frequently asked questions
When is the full moon in December 2025?
4 Dec 2025 at 23:14 UTC, with the Moon in Gemini. The table above converts that moment to your own time zone, which can move it to the day before or after.
When is the new moon in December 2025?
20 Dec 2025 at 01:44 UTC, with the Moon in Sagittarius. Times on this page are shown in your browser's time zone once the page loads.
Which time zone are these times in?
They are calculated in UTC and then converted by your browser to whichever time zone your device is set to — the page names it under the heading. A lunation is a single moment for the whole planet, so only the clock reading changes, never the event.
What does "void of course" mean in this table?
The Moon is void of course between its last exact aspect to a planet and the moment it enters the next sign. Traditional practice treats it as a poor window for starting something you want to stick, and a fine one for rest, tidying and finishing off. It is a timing convention, not a forecast of events.
How accurate are these dates?
They come from the same ephemeris engine as our birth chart calculator (astronomy-engine), not from a copied table. New and full moon moments were checked against AstroPixels (Fred Espenak, NASA/GSFC) and agree to well under two minutes.
Esotorium reports and tools are for self-reflection and entertainment. They are not medical, psychological, financial or legal advice, and they do not predict events.