- 4 Dec, 00:57 Vilnius time: last quarter.
- 10 Dec, 15:55 Vilnius time: new moon.
- 17 Dec, 19:30 Vilnius time: first quarter.
- 26 Dec, 00:01 Vilnius time: full moon, traditionally the Cold Moon.
- During December 2091 the Moon passes through all eight phases. One full cycle takes about 29.5 days.
- The next full moon after this month is on 24 January 2092 (January 2092).
Moon phase times, December 2091
The four principal phases are moments, not whole days. Times are given in UTC and in Europe/Vilnius time.
| Date | Phase | Europe/Vilnius | UTC |
|---|---|---|---|
| Tue 4 Dec | Last quarter | 00:57 | 22:57 |
| Mon 10 Dec | New moon | 15:55 | 13:55 |
| Mon 17 Dec | First quarter | 19:30 | 17:30 |
| Wed 26 Dec | Full moon · Cold Moon | 00:01 | 22:01 |
The sky: December 2091
Planets and sky events this month, as seen in London. The Moon's phases are in the calendar above.
Planets visible (mid-month)
Events
| Sat 1 Dec | Venus and Mars together | Only 0.7° apart: both fit in a binocular field. |
| Tue 4 Dec | Mercury farthest from the Sun | 20° in the morning sky. Look low in the east before sunrise. |
| Sun 9 Dec | The Moon near Mercury | About 3.1° apart. Look for Mercury next to the Moon. |
| Tue 11 Dec | Venus and Jupiter together | Only 1.6° apart: both fit in a binocular field. |
| Wed 12 Dec | The Moon near Mars | About 4.1° apart. Look for Mars next to the Moon. |
| Thu 13 Dec | The Moon near Jupiter | About 3.0° apart. Look for Jupiter next to the Moon. |
| Thu 13 Dec | The Moon near Venus | About 4.4° apart. Look for Venus next to the Moon. |
| Thu 13 Dec | Geminids meteor shower peak | Up to 150 meteors an hour in a perfect sky. The Moon is 15% lit and will not interfere. |
| Thu 20 Dec | Mars and Jupiter together | Only 0.8° apart: both fit in a binocular field. |
| Fri 21 Dec | Ursids meteor shower peak | Up to 10 meteors an hour in a perfect sky. The Moon is 88% lit: only the brightest meteors will show. |
| Wed 26 Dec | The Moon near Saturn | About 2.9° apart. Look for Saturn next to the Moon. |
| Thu 27 Dec | Saturn at opposition | The planet is opposite the Sun: it rises at sunset, is up all night and at its brightest of the year. |
How to read the moon calendar
Each day shows its date, the share of the Moon’s disc that is lit at noon, and the Moon’s shape that day. When a full moon, new moon or quarter falls on a day, it is named at the bottom of the cell.
Illumination is the part of the disc lit by the Sun. It grows from new moon to full moon (waxing) and shrinks from full moon to new moon (waning). Each day opens its own page with every signal for that date.
Full moon dates 2091
| Date | Time (UTC) | Traditional name | |
|---|---|---|---|
| Fri 5 Jan | 15:52 | Wolf Moon | next |
| Sun 4 Feb | 04:47 | Snow Moon | |
| Mon 5 Mar | 16:00 | Worm Moon | |
| Wed 4 Apr | 01:32 | Pink Moon | |
| Thu 3 May | 09:47 | Flower Moon | |
| Fri 1 Jun | 17:32 | Strawberry Moon | |
| Sun 1 Jul | 01:55 | Buck Moon | |
| Mon 30 Jul | 12:02 | Blue Moon | |
| Wed 29 Aug | 00:41 | Sturgeon Moon | |
| Thu 27 Sep | 15:57 | Harvest Moon | |
| Sat 27 Oct | 09:19 | Hunter’s Moon | |
| Mon 26 Nov | 03:44 | Beaver Moon | |
| Wed 26 Dec | 22:01 | Cold Moon |
New moon dates 2091
| Date | Time (UTC) | |
|---|---|---|
| Fri 19 Jan | 16:32 | next |
| Sun 18 Feb | 09:39 | |
| Tue 20 Mar | 03:47 | |
| Thu 19 Apr | 21:21 | |
| Fri 18 May | 13:08 | |
| Sun 17 Jun | 02:42 | |
| Mon 16 Jul | 14:17 | |
| Wed 15 Aug | 00:23 | |
| Thu 13 Sep | 09:36 | |
| Fri 12 Oct | 18:30 | |
| Sun 11 Nov | 03:43 | |
| Mon 10 Dec | 13:55 |
The eight moon phases explained
Four principal phases are exact instants; the four in between are the days that connect them.
Solar and lunar eclipses in 2091
No eclipse data for 2091.
The waning moon is traditionally a time for finishing
Questions people ask
When is the full moon in December 2091?
The full moon is on 26 December 2091. Its traditional name is the Cold Moon. The exact time is in the table on this page.
When is the new moon in December 2091?
The new moon is on 10 December 2091. The Moon can’t be seen that night: it sits between Earth and the Sun with its lit side turned away.
What do the percentages mean?
They show how much of the Moon’s disc is lit at noon. 0% is new moon, 100% is full moon and 50% is a quarter.
Why does another calendar give a different date?
A phase is a moment. When it falls near midnight, the date can differ by one day between time zones. This calendar uses Europe/Vilnius time for the days.
How often is there a full moon?
About every 29.5 days. Some months have two; the second is called a Blue Moon.
- Jean Meeus, Astronomical Algorithms, 2nd ed., Willmann-Bell, 1998, chapters 48 and 49.
- NASA Eclipse Web Site (eclipse dates and visibility).
Numbers update through the day from public sources. The text for each day is written from that day’s data and checked by the editor. Every past day keeps its own page in the archive.