The typical answer is 29 and a half days. However it can range between 29.8 days and 29.3 days.
More intrestingly the variation between the max and min number of days varies from year to year. In some years the variation can be more than half a day, in other years the diferance might be only a quater of a day.
For the real maths heads amongst you a spectral analysis gives two dominant frequencies of 1/413 days and 1/362 days. I.E. with dominant frequency of once every 413 days and beat frequency once every 7.92 years.
| abs of Fourier coeff | Frequency, cycles per 5787.87 days | Wave Length (years:days) |
|---|---|---|
| 17.2752 | 14 | 1 y 48 days |
| 8.3210 | 16 | 361 days |
| 2.9044 | 15 | |
| 1.8641 | 13 | |
| 1.1522 | 28 |
The above graph has been based on data from U.S. Naval Observatory Astronomical Applications Department
NEW MOON FIRST QUARTER FULL MOON LAST QUARTER Days between full moons
04/01/90 10:40 11/01/90 04:57 18/01/90 21:17
26/01/90 19:20 02/02/90 18:32 09/02/90 19:16 17/02/90 18:48 29.60
25/02/90 08:54 04/03/90 02:05 11/03/90 10:58 19/03/90 14:30 29.65
26/03/90 19:48 02/04/90 10:24 10/04/90 03:18 18/04/90 07:02 29.68
25/04/90 04:27 01/05/90 20:18 09/05/90 19:31 17/05/90 19:45 29.68
24/05/90 11:47 31/05/90 08:11 08/06/90 11:01 16/06/90 04:48 29.65
22/06/90 18:55 29/06/90 22:07 08/07/90 01:23 15/07/90 11:04 29.60
22/07/90 02:54 29/07/90 14:01 06/08/90 14:19 13/08/90 15:54 29.54
20/08/90 12:39 28/08/90 07:34 05/09/90 01:46 11/09/90 20:53 29.48
19/09/90 00:46 27/09/90 02:06 04/10/90 12:02 11/10/90 03:31 29.43
18/10/90 15:37 26/10/90 20:26 02/11/90 21:48 09/11/90 13:02 29.41
17/11/90 09:05 25/11/90 13:11 02/12/90 07:50 09/12/90 02:04 29.42
17/12/90 04:22 25/12/90 03:16 31/12/90 18:35 07/01/91 18:35 29.45
15/01/91 23:50 23/01/91 14:21 30/01/91 06:10 06/02/91 13:52 29.48
14/02/91 17:32 21/02/91 22:58 28/02/91 18:25 08/03/91 10:32 29.51
16/03/91 08:10 23/03/91 06:03 30/03/91 07:17 07/04/91 06:45 29.54
14/04/91 19:38 21/04/91 12:39 28/04/91 20:58 07/05/91 00:46 29.57
14/05/91 04:36 20/05/91 19:46 28/05/91 11:37 05/06/03 15:30 29.61
12/06/91 12:06 19/06/91 04:19 27/06/91 02:58 05/07/91 02:50 29.64
11/07/91 19:06 18/07/91 15:11 26/07/91 18:24 03/08/91 11:25 29.64
10/08/91 02:28 17/08/91 05:01 25/08/91 09:07 01/09/91 18:16 29.61
08/09/91 11:01 15/09/91 22:01 23/09/91 22:40 01/10/91 00:30 29.56
07/10/91 21:39 15/10/91 17:33 23/10/91 11:08 30/10/91 07:10 29.52
06/11/91 11:11 14/11/91 14:02 21/11/91 22:56 28/11/91 15:21 29.49
06/12/91 03:56 14/12/91 09:32 21/12/91 10:23 28/12/91 01:55 29.48
04/01/92 23:10 13/01/92 02:32 19/01/92 21:28 26/01/92 15:27 29.46
03/02/92 19:00 11/02/92 16:15 18/02/92 08:04 25/02/92 07:56 29.44
04/03/92 13:22 12/03/92 02:36 18/03/92 18:18 26/03/92 02:30 29.43
03/04/92 05:01 10/04/92 10:06 17/04/92 04:42 24/04/92 21:40 29.43
02/05/92 17:44 09/05/92 15:43 16/05/92 16:03 24/05/92 15:53 29.47
01/06/92 03:57 07/06/92 20:47 15/06/92 04:50 23/06/92 08:11 29.53
30/06/92 12:18 07/07/92 02:43 14/07/92 19:06 22/07/92 22:12 29.59
29/07/92 19:35 05/08/92 10:58 13/08/92 10:27 21/08/92 10:01 29.64
28/08/92 02:42 03/09/92 22:39 12/09/92 02:17 19/09/92 19:53 29.66
26/09/92 10:40 03/10/92 14:12 11/10/92 18:03 19/10/92 04:12 29.66
25/10/92 20:34 02/11/92 09:11 10/11/92 09:20 17/11/92 11:39 29.64
24/11/92 09:11 02/12/92 06:17 09/12/92 23:41 16/12/92 19:13 29.60
24/12/92 00:43 01/01/93 03:38 08/01/93 12:37 15/01/93 04:01 29.54
22/01/93 18:27 30/01/93 23:20 06/02/93 23:55 13/02/93 14:57 29.47
21/02/93 13:05 01/03/93 15:46 08/03/93 09:46 15/03/93 04:16 29.41
23/03/93 07:14 31/03/93 04:10 06/04/93 18:43 13/04/93 19:39 29.37
21/04/93 23:49 29/04/93 12:40 06/05/93 03:34 13/05/93 12:20 29.37
21/05/93 14:06 28/05/93 18:21 04/06/93 13:02 12/06/93 05:36 29.39
20/06/93 01:52 26/06/93 22:43 03/07/93 23:45 11/07/93 22:49 29.45
19/07/93 11:24 26/07/93 03:25 02/08/93 12:10 10/08/93 15:19 29.52
17/08/93 19:28 24/08/93 09:57 01/09/93 02:33 09/09/93 06:26 29.60
16/09/93 03:10 22/09/93 19:32 30/09/93 18:54 08/10/93 19:35 29.68
15/10/93 11:36 22/10/93 08:52 30/10/93 12:38 07/11/93 06:36 29.74
13/11/93 21:34 21/11/93 02:03 29/11/93 06:31 06/12/93 15:49 29.75
13/12/93 09:27 20/12/93 22:26 28/12/93 23:05 05/01/94 00:00 29.69
11/01/94 23:10 19/01/94 20:27 27/01/94 13:23 03/02/94 08:06 29.60
10/02/94 14:30 18/02/94 17:47 26/02/94 01:15 04/03/94 16:53 29.49
12/03/94 07:05 20/03/94 12:14 27/03/94 11:09 03/04/94 02:55 29.41
11/04/94 00:17 19/04/94 02:34 25/04/94 19:45 02/05/94 14:32 29.36
10/05/94 17:07 18/05/94 12:50 25/05/94 03:39 01/06/94 04:02 29.33
09/06/94 08:26 16/06/94 19:56 23/06/94 11:33 30/06/94 19:31 29.33
08/07/94 21:37 16/07/94 01:12 22/07/94 20:16 30/07/94 12:40 29.36
07/08/94 08:45 14/08/94 05:57 21/08/94 06:47 29/08/94 06:41 29.44
05/09/94 18:33 12/09/94 11:34 19/09/94 20:00 28/09/94 00:23 29.55
05/10/94 03:55 11/10/94 19:17 19/10/94 12:18 27/10/94 16:44 29.68
03/11/94 13:35 10/11/94 06:14 18/11/94 06:57 26/11/94 07:04 29.78
02/12/94 23:54 09/12/94 21:06 18/12/94 02:17 25/12/94 19:06 29.81
01/01/95 01:56 08/01/95 15:46 16/01/95 20:26 24/01/95 04:58 29.76
30/01/95 22:48 07/02/95 12:54 15/02/95 12:15 22/02/95 13:04 29.66
01/03/95 11:48 09/03/95 10:14 17/03/95 01:26 23/03/95 20:10 29.55
31/03/95 02:09 08/04/95 05:35 15/04/95 12:08 22/04/95 03:18 29.45
29/04/95 17:36 07/05/95 21:44 14/05/95 20:48 21/05/95 11:36 29.36
29/05/95 09:27 06/06/95 10:26 13/06/95 04:03 19/06/95 22:01 29.30
28/06/95 00:50 05/07/95 20:02 12/07/95 10:49 19/07/95 11:10 29.28
27/07/95 15:13 04/08/95 03:16 10/08/95 18:15 18/08/95 03:04 29.31
26/08/95 04:31 02/09/95 09:03 09/09/95 03:37 16/09/95 21:09 29.39
24/09/95 16:55 01/10/95 14:36 08/10/95 15:52 16/10/95 16:26 29.51
24/10/95 04:36 30/10/95 21:17 07/11/95 07:20 15/11/95 11:40 29.64
22/11/95 15:43 29/11/95 06:28 07/12/95 01:27 15/12/95 05:31 29.75
22/12/95 02:22 28/12/95 19:06 05/01/96 20:51 13/01/96 20:45 29.81
20/01/96 12:50 27/01/96 11:14 04/02/96 15:58 12/02/96 08:37 29.80
18/02/96 23:30 26/02/96 05:52 05/03/96 09:23 12/03/96 17:15 29.73
19/03/96 10:45 27/03/96 01:31 04/04/96 00:07 10/04/96 23:36 29.61
17/04/96 22:49 25/04/96 20:40 03/05/96 11:48 10/05/96 05:04 29.49
17/05/96 11:46 25/05/96 14:13 01/06/96 20:47 08/06/96 11:05 29.37
16/06/96 01:36 24/06/96 05:23 01/07/96 03:58 07/07/96 18:55 29.30
15/07/96 16:15 23/07/96 17:49 30/07/96 10:35 06/08/96 05:25 29.28
14/08/96 07:34 22/08/96 03:36 28/08/96 17:52 04/09/96 19:06 29.30
12/09/96 23:07 20/09/96 11:23 27/09/96 02:51 04/10/96 12:04 29.37
12/10/96 14:14 19/10/96 18:09 26/10/96 14:11 03/11/96 07:50 29.47
11/11/96 04:16 18/11/96 01:09 25/11/96 04:10 03/12/96 05:06 29.58
10/12/96 16:56 17/12/96 09:31 24/12/96 20:41 02/01/97 01:45 29.69
09/01/97 04:26 15/01/97 20:02 23/01/97 15:11 31/01/97 19:40 29.77
07/02/97 15:06 14/02/97 08:57 22/02/97 10:27 02/03/97 09:37 29.80
09/03/97 01:15 16/03/97 00:06 24/03/97 04:45 31/03/97 19:38 29.76
07/04/97 11:02 14/04/97 17:00 22/04/97 20:33 30/04/97 02:37 29.66
06/05/97 20:46 14/05/97 10:55 22/05/97 09:13 29/05/97 07:51 29.53
05/06/97 07:03 13/06/97 04:51 20/06/97 19:09 27/06/97 12:42 29.41
04/07/97 18:40 12/07/97 21:44 20/07/97 03:20 26/07/97 18:28 29.34
03/08/97 08:14 11/08/97 12:42 18/08/97 10:55 25/08/97 02:23 29.32
01/09/97 23:52 10/09/97 01:31 16/09/97 18:50 23/09/97 13:35 29.33
01/10/97 16:51 09/10/97 12:22 16/10/97 03:46 23/10/97 04:48 29.37
31/10/97 10:01 07/11/97 21:43 14/11/97 14:12 21/11/97 23:58 29.43
30/11/97 02:14 07/12/97 06:09 14/12/97 02:37 21/12/97 21:43 29.52
29/12/97 16:56 05/01/98 14:18 12/01/98 17:24 20/01/98 19:40 29.62
28/01/98 06:01 03/02/98 22:53 11/02/98 10:23 19/02/98 15:27 29.71
26/02/98 17:26 05/03/98 08:41 13/03/98 04:34 21/03/98 07:38 29.76
28/03/98 03:14 03/04/98 20:18 11/04/98 22:23 19/04/98 19:53 29.74
26/04/98 11:41 03/05/98 10:04 11/05/98 14:29 19/05/98 04:35 29.67
25/05/98 19:32 02/06/98 01:45 10/06/98 04:18 17/06/98 10:38 29.58
24/06/98 03:50 01/07/98 18:43 09/07/98 16:01 16/07/98 15:13 29.49
23/07/98 13:44 31/07/98 12:05 08/08/98 02:10 14/08/98 19:48 29.42
22/08/98 02:03 30/08/98 05:06 06/09/98 11:21 13/09/98 01:58 29.38
20/09/98 17:01 28/09/98 21:11 05/10/98 20:12 12/10/98 11:11 29.37
20/10/98 10:09 28/10/98 11:46 04/11/98 05:18 11/11/98 00:28 29.38
19/11/98 04:27 27/11/98 00:23 03/12/98 15:19 10/12/98 17:53 29.42
18/12/98 22:42 26/12/98 10:46 02/01/99 02:49 09/01/99 14:22 29.48
17/01/99 15:46 24/01/99 19:15 31/01/99 16:06 08/02/99 11:58 29.55
16/02/99 06:39 23/02/99 02:43 02/03/99 06:58 10/03/99 08:40 29.62
17/03/99 18:48 24/03/99 10:18 31/03/99 22:49 09/04/99 02:51 29.66
16/04/99 04:22 22/04/99 19:01 30/04/99 14:55 08/05/99 17:28 29.67
15/05/99 12:05 22/05/99 05:34 30/05/99 06:40 07/06/99 04:20 29.66
13/06/99 19:03 20/06/99 18:13 28/06/99 21:37 06/07/99 11:57 29.62
13/07/99 02:24 20/07/99 09:00 28/07/99 11:25 04/08/99 17:27 29.58
11/08/99 11:08 19/08/99 01:47 26/08/99 23:48 02/09/99 22:17 29.52
09/09/99 22:02 17/09/99 20:06 25/09/99 10:51 02/10/99 04:02 29.46
09/10/99 11:34 17/10/99 15:00 24/10/99 21:02 31/10/99 12:04 29.42
08/11/99 03:53 16/11/99 09:03 23/11/99 07:04 29/11/99 23:18 29.42
07/12/99 22:32 16/12/99 00:50 22/12/99 17:31 29/12/99 14:04 29.44
06/01/00 01:14 14/01/00 13:34 21/01/00 04:40 28/01/00 07:57 29.46
05/02/00 13:03 12/02/00 23:21 19/02/00 16:27 27/02/00 03:53 29.49
06/03/00 05:17 13/03/00 06:59 20/03/00 04:44 28/03/00 00:21 29.51
04/04/00 18:12 11/04/00 13:30 18/04/00 17:41 26/04/00 19:30 29.54
04/05/00 04:12 10/05/00 20:00 18/05/00 07:34 26/05/00 11:55 29.58
02/06/00 12:14 09/06/00 03:29 16/06/00 22:27 25/06/00 01:00 29.62
01/07/00 19:20 08/07/00 12:53 16/07/00 13:55 24/07/00 11:02 29.64
31/07/00 02:25 07/08/00 01:02 15/08/00 05:13 22/08/00 18:51 29.64
29/08/00 10:19 05/09/00 16:27 13/09/00 19:37 21/09/00 01:28 29.60
27/09/00 19:53 05/10/00 10:59 13/10/00 08:53 20/10/00 07:59 29.55
27/10/00 07:58 04/11/00 07:27 11/11/00 21:15 18/11/00 15:24 29.52
25/11/00 23:11 04/12/00 03:55 11/12/00 09:03 18/12/00 00:41 29.49
25/12/00 17:22 02/01/01 22:31 09/01/01 20:24 16/01/01 12:35 29.47
24/01/01 13:07 01/02/01 14:02 08/02/01 07:12 15/02/01 03:23 29.45
23/02/01 08:21 03/03/01 02:03 09/03/01 17:23 16/03/01 20:45 29.42
25/03/01 01:21 01/04/01 10:49 08/04/01 03:22 15/04/01 15:31 29.42
23/04/01 15:26 30/04/01 17:08 07/05/01 13:52 15/05/01 10:11 29.44
23/05/01 02:46 29/05/01 22:09 06/06/01 01:39 14/06/01 03:28 29.49
21/06/01 11:58 28/06/01 03:19 05/07/01 15:04 13/07/01 18:45 29.56
20/07/01 19:44 27/07/01 10:08 04/08/01 05:56 12/08/01 07:53 29.62
19/08/01 02:55 25/08/01 19:55 02/09/01 21:43 10/09/01 18:59 29.66
17/09/01 10:27 24/09/01 09:31 02/10/01 13:49 10/10/01 04:20 29.67
16/10/01 19:23 24/10/01 02:58 01/11/01 05:41 08/11/01 12:21 29.66
15/11/01 06:40 22/11/01 23:21 30/11/01 20:49 07/12/01 19:52 29.63
14/12/01 20:47 22/12/01 20:56 30/12/01 10:40 06/01/02 03:55 29.58
13/01/02 13:29 21/01/02 17:46 28/01/02 22:50 04/02/02 13:33 29.51
12/02/02 07:41 20/02/02 12:02 27/02/02 09:17 06/03/02 01:24 29.44
14/03/02 02:02 22/03/02 02:28 28/03/02 18:25 04/04/02 15:29 29.38
12/04/02 19:21 20/04/02 12:48 27/04/02 03:00 04/05/02 07:16 29.36
12/05/02 10:45 19/05/02 19:42 26/05/02 11:51 03/06/02 00:05 29.37
10/06/02 23:46 18/06/02 00:29 24/06/02 21:42 02/07/02 17:19 29.41
10/07/02 10:26 17/07/02 04:47 24/07/02 09:07 01/08/02 10:22 29.48
08/08/02 19:15 15/08/02 10:12 22/08/02 22:29 31/08/02 02:31 29.56
07/09/02 03:10 13/09/02 18:08 21/09/02 13:59 29/09/02 17:03 29.65
06/10/02 11:18 13/10/02 05:33 21/10/02 07:20 29/10/02 05:28 29.72
04/11/02 20:34 11/11/02 20:52 20/11/02 01:34 27/11/02 15:46 29.76
04/12/02 07:34 11/12/02 15:49 19/12/02 19:10 27/12/02 00:31 29.73
02/01/03 20:23 10/01/03 13:15 18/01/03 10:48 25/01/03 08:33 29.65
01/02/03 10:48 09/02/03 11:11 16/02/03 23:51 23/02/03 16:46 29.54
03/03/03 02:35 11/03/03 07:15 18/03/03 10:34 25/03/03 01:51 29.45
01/04/03 19:19 09/04/03 23:40 16/04/03 19:36 23/04/03 12:18 29.38
01/05/03 12:15 09/05/03 11:53 16/05/03 03:36 23/05/03 00:31 29.33
31/05/03 04:20 07/06/03 20:28 14/06/03 11:16 21/06/03 14:45 29.32
29/06/03 18:39 07/07/03 02:32 13/07/03 19:21 21/07/03 07:01 29.34
29/07/03 06:53 05/08/03 07:28 12/08/03 04:48 20/08/03 00:48 29.39
27/08/03 17:26 03/09/03 12:34 10/09/03 16:36 18/09/03 19:03 29.49
26/09/03 03:09 02/10/03 19:09 10/10/03 07:27 18/10/03 12:31 29.62
25/10/03 12:50 01/11/03 04:25 09/11/03 01:13 17/11/03 04:15 29.74
23/11/03 22:59 30/11/03 17:16 08/12/03 20:37 16/12/03 17:42 29.81
23/12/03 09:43 30/12/03 10:03 07/01/04 15:40 15/01/04 04:46 29.79
21/01/04 21:05 29/01/04 06:03 06/02/04 08:47 13/02/04 13:40 29.71
20/02/04 09:18 28/02/04 03:24 06/03/04 23:14 13/03/04 21:01 29.60
20/03/04 22:41 28/03/04 23:48 05/04/04 11:03 12/04/04 03:46 29.49
19/04/04 13:21 27/04/04 17:32 04/05/04 20:33 11/05/04 11:04 29.40
19/05/04 04:52 27/05/04 07:57 03/06/04 04:20 09/06/04 20:02 29.32
17/06/04 20:27 25/06/04 19:08 02/07/04 11:09 09/07/04 07:34 29.28
17/07/04 11:24 25/07/04 03:37 31/07/04 18:05 07/08/04 22:01 29.29
16/08/04 01:24 23/08/04 10:12 30/08/04 02:22 06/09/04 15:11 29.35
14/09/04 14:29 21/09/04 15:54 28/09/04 13:09 06/10/04 10:12 29.45
14/10/04 02:48 20/10/04 21:59 28/10/04 03:07 05/11/04 05:53 29.58
12/11/04 14:27 19/11/04 05:50 26/11/04 20:07 05/12/04 00:53 29.71
12/12/04 01:29 18/12/04 16:40 26/12/04 15:06 03/01/05 17:46 29.79
10/01/05 12:03 17/01/05 06:57 25/01/05 10:32 02/02/05 07:27 29.81
08/02/05 22:28 16/02/05 00:16 24/02/05 04:54 03/03/05 17:36 29.77
10/03/05 09:10 17/03/05 19:19 25/03/05 20:58 02/04/05 00:50 29.67
08/04/05 20:32 16/04/05 14:37 24/04/05 10:06 01/05/05 06:24 29.55
08/05/05 08:45 16/05/05 08:56 23/05/05 20:18 30/05/05 11:47 29.43
06/06/05 21:55 15/06/05 01:22 22/06/05 04:14 28/06/05 18:23 29.33
06/07/05 12:02 14/07/05 15:20 21/07/05 11:00 28/07/05 03:19 29.28
05/08/05 03:05 13/08/05 02:38 19/08/05 17:53 26/08/05 15:18 29.29
03/09/05 18:45 11/09/05 11:37 18/09/05 02:01 25/09/05 06:41 29.34
03/10/05 10:28 10/10/05 19:01 17/10/05 12:14 25/10/05 01:17 29.43
02/11/05 01:24 09/11/05 01:57 16/11/05 00:57 23/11/05 22:11 29.53
01/12/05 15:01 08/12/05 09:36 15/12/05 16:15 23/12/05 19:36 29.64
31/12/05 03:12