New moon dates 2031
- 2031: 12 × new moon — 23 January 2031, 21 February 2031, 23 March 2031, 21 April 2031, 21 May 2031, 20 June 2031, 19 July 2031, 18 August 2031, 16 September 2031, 16 October 2031, 14 November 2031, 14 December 2031.
- Next: 23 January 2031.
New moon dates 2031
| Date | Time (UTC) | |
|---|---|---|
| Thu 23 Jan | 04:31 | next |
| Fri 21 Feb | 15:48 | |
| Sun 23 Mar | 03:49 | |
| Mon 21 Apr | 16:57 | |
| Wed 21 May | 07:17 | |
| Fri 20 Jun | 22:24 | |
| Sat 19 Jul | 13:40 | |
| Mon 18 Aug | 04:32 | |
| Tue 16 Sep | 18:47 | |
| Thu 16 Oct | 08:20 | |
| Fri 14 Nov | 21:09 | |
| Sun 14 Dec | 09:05 |
Questions people ask
What is a moon day?
A moon day counts the days since the last new moon: the first moon day starts at the new moon, the fifteenth around the full moon. The count on this page is the whole number of days since the last new moon plus one.
Is the moon waxing or waning?
Waxing means the lit part is growing (from new moon to full moon); waning means it is shrinking (from full moon to new moon). In the northern hemisphere a waxing moon is lit on the right.
How are the phase times calculated?
With the algorithms published by Jean Meeus in Astronomical Algorithms (1998), including the periodic terms, which give the phase instants to about one minute.