- 7 Dec, 14:18 Vilnius time: first quarter.
- 15 Dec, 03:49 Vilnius time: full moon, traditionally the Cold Moon.
- 21 Dec, 20:53 Vilnius time: last quarter.
- 29 Dec, 06:38 Vilnius time: new moon.
- During December 1921 the Moon passes through all eight phases. One full cycle takes about 29.5 days.
- The next full moon after this month is on 13 January 1922 (January 1922).
Moon phase times, December 1921
The four principal phases are moments, not whole days. Times are given in UTC and in Europe/Vilnius time.
| Date | Phase | Europe/Vilnius | UTC |
|---|---|---|---|
| Wed 7 Dec | First quarter | 14:18 | 13:18 |
| Thu 15 Dec | Full moon · Cold Moon | 03:49 | 02:49 |
| Wed 21 Dec | Last quarter | 20:53 | 19:53 |
| Thu 29 Dec | New moon | 06:38 | 05:38 |
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 1921
| Date | Time (UTC) | Traditional name | |
|---|---|---|---|
| Mon 24 Jan | 23:06 | Wolf Moon | passed |
| Tue 22 Feb | 09:31 | Snow Moon | passed |
| Wed 23 Mar | 20:17 | Worm Moon | passed |
| Fri 22 Apr | 07:48 | Pink Moon | passed |
| Sat 21 May | 20:14 | Flower Moon | passed |
| Mon 20 Jun | 09:40 | Strawberry Moon | passed |
| Wed 20 Jul | 00:06 | Buck Moon | passed |
| Thu 18 Aug | 15:27 | Sturgeon Moon | passed |
| Sat 17 Sep | 07:18 | Harvest Moon | passed |
| Sun 16 Oct | 22:58 | Hunter’s Moon | passed |
| Tue 15 Nov | 13:37 | Beaver Moon | passed |
| Thu 15 Dec | 02:49 | Cold Moon | passed |
New moon dates 1921
| Date | Time (UTC) | |
|---|---|---|
| Sun 9 Jan | 05:25 | passed |
| Tue 8 Feb | 00:35 | passed |
| Wed 9 Mar | 18:08 | passed |
| Fri 8 Apr | 09:04 | passed |
| Sat 7 May | 21:00 | passed |
| Mon 6 Jun | 06:13 | passed |
| Tue 5 Jul | 13:35 | passed |
| Wed 3 Aug | 20:16 | passed |
| Fri 2 Sep | 03:31 | passed |
| Sat 1 Oct | 12:25 | passed |
| Mon 31 Oct | 23:37 | passed |
| Tue 29 Nov | 13:24 | passed |
| Thu 29 Dec | 05:38 | passed |
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 1921
No eclipse data for 1921.
The waning moon is traditionally a time for finishing
Questions people ask
When is the full moon in December 1921?
The full moon is on 15 December 1921. Its traditional name is the Cold Moon. The exact time is in the table on this page.
When is the new moon in December 1921?
The new moon is on 29 December 1921. 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.