New moon dates 1931
- 1931: 12 × new moon — 18 January 1931, 17 February 1931, 19 March 1931, 18 April 1931, 17 May 1931, 16 June 1931, 15 July 1931, 13 August 1931, 12 September 1931, 11 October 1931, 9 November 1931, 9 December 1931.
New moon dates 1931
| Date | Time (UTC) | |
|---|---|---|
| Sun 18 Jan | 18:34 | passed |
| Tue 17 Feb | 13:09 | passed |
| Thu 19 Mar | 07:49 | passed |
| Sat 18 Apr | 00:58 | passed |
| Sun 17 May | 15:26 | passed |
| Tue 16 Jun | 03:00 | passed |
| Wed 15 Jul | 12:19 | passed |
| Thu 13 Aug | 20:26 | passed |
| Sat 12 Sep | 04:25 | passed |
| Sun 11 Oct | 13:05 | passed |
| Mon 9 Nov | 22:54 | passed |
| Wed 9 Dec | 10:15 | passed |
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.