September 2012 (Gregorian)

Twilight and Astronomy Information

Greenwich Observatory, UK: 51.4778°N, 0°E, elevation 46.9m, time zone UT (Standard Time)

Date	Start of Twilight			Sun Rise	Rise Az ° S-E+N	Mid Day	° Sun Long	EoT	Day Span	Day Hour	Set Az ° S-W+N	Sun Set	° Moon Phase	End of Twilight			Mid- Night	Night Span	Night Hour
	Astro	Sea	Civil											Civil	Sea	Astro
1 Sat	03:08	03:55	04:38	05:12	+13.12	12:00	159.4	+0.1	13:35	1:08	+12.79	18:47	-165.5	19:20	20:03	20:50	00:00	10:26	0:52
2 Sun	03:11	03:57	04:40	05:13	+12.53	12:00	160.4	+0.4	13:32	1:08	+12.19	18:45	-153.8	19:18	20:00	20:47	23:59	10:30	0:52
3 Mon	03:13	03:59	04:42	05:15	+11.93	11:59	161.4	+0.8	13:28	1:07	+11.60	18:43	-142.3	19:16	19:58	20:44	23:59	10:34	0:53
4 Tue	03:15	04:01	04:43	05:16	+11.33	11:59	162.4	+1.1	13:24	1:07	+11.00	18:40	-131.1	19:13	19:55	20:41	23:59	10:38	0:53
5 Wed	03:17	04:03	04:45	05:18	+10.73	11:59	163.3	+1.4	13:20	1:07	+10.39	18:38	-120.1	19:11	19:53	20:38	23:58	10:41	0:53
6 Thu	03:20	04:05	04:47	05:20	+10.12	11:58	164.3	+1.8	13:16	1:06	+9.79	18:36	-109.3	19:09	19:50	20:35	23:58	10:45	0:54
7 Fri	03:22	04:07	04:48	05:21	+9.52	11:58	165.3	+2.1	13:12	1:06	+9.18	18:34	-98.5	19:06	19:47	20:32	23:58	10:49	0:54
8 Sat	03:24	04:09	04:50	05:23	+8.91	11:58	166.2	+2.5	13:09	1:06	+8.58	18:31	-87.6	19:04	19:45	20:29	23:57	10:53	0:54
9 Sun	03:26	04:11	04:52	05:24	+8.30	11:57	167.2	+2.8	13:05	1:05	+7.97	18:29	-76.6	19:01	19:42	20:26	23:57	10:57	0:55
10 Mon	03:28	04:12	04:53	05:26	+7.68	11:57	168.2	+3.1	13:01	1:05	+7.35	18:27	-65.4	18:59	19:40	20:23	23:57	11:01	0:55
11 Tue	03:31	04:14	04:55	05:28	+7.07	11:56	169.1	+3.5	12:57	1:05	+6.74	18:24	-54.0	18:57	19:37	20:21	23:56	11:05	0:55
12 Wed	03:33	04:16	04:57	05:29	+6.45	11:56	170.1	+3.9	12:53	1:04	+6.13	18:22	-42.1	18:54	19:35	20:18	23:56	11:09	0:56
13 Thu	03:35	04:18	04:58	05:31	+5.84	11:56	171.1	+4.2	12:49	1:04	+5.51	18:20	-29.9	18:52	19:32	20:15	23:56	11:13	0:56
14 Fri	03:37	04:20	05:00	05:32	+5.22	11:55	172.1	+4.6	12:45	1:04	+4.89	18:18	-17.3	18:50	19:30	20:12	23:55	11:16	0:56
15 Sat	03:39	04:22	05:02	05:34	+4.60	11:55	173.0	+4.9	12:41	1:03	+4.27	18:15	-4.4	18:47	19:27	20:10	23:55	11:20	0:57
16 Sun	03:41	04:23	05:03	05:36	+3.98	11:55	174.0	+5.3	12:37	1:03	+3.65	18:13	+8.9	18:45	19:25	20:07	23:55	11:24	0:57
17 Mon	03:43	04:25	05:05	05:37	+3.36	11:54	175.0	+5.6	12:33	1:03	+3.03	18:11	+22.3	18:43	19:22	20:04	23:54	11:28	0:57
18 Tue	03:45	04:27	05:07	05:39	+2.73	11:54	176.0	+6.0	12:30	1:02	+2.41	18:08	+35.8	18:40	19:20	20:02	23:54	11:32	0:58
19 Wed	03:47	04:29	05:08	05:40	+2.11	11:54	176.9	+6.3	12:26	1:02	+1.79	18:06	+49.3	18:38	19:17	19:59	23:53	11:36	0:58
20 Thu	03:49	04:30	05:10	05:42	+1.49	11:53	177.9	+6.7	12:22	1:02	+1.17	18:04	+62.7	18:36	19:15	19:56	23:53	11:40	0:58
21 Fri	03:51	04:32	05:12	05:44	+0.86	11:53	178.9	+7.1	12:18	1:01	+0.54	18:01	+76.0	18:33	19:13	19:54	23:53	11:44	0:59
22 Sat	03:53	04:34	05:13	05:45	+0.24	11:53	179.9	+7.4	12:14	1:01	-0.08	17:59	+89.1	18:31	19:10	19:51	23:52	11:48	0:59
23 Sun	03:55	04:36	05:15	05:47	-0.39	11:52	180.9	+7.8	12:10	1:01	-0.71	17:57	+102.0	18:29	19:08	19:48	23:52	11:52	0:59
24 Mon	03:56	04:37	05:17	05:48	-1.02	11:52	181.8	+8.1	12:06	1:01	-1.33	17:54	+114.7	18:26	19:05	19:46	23:52	11:55	1:00
25 Tue	03:58	04:39	05:18	05:50	-1.64	11:52	182.8	+8.5	12:02	1:00	-1.95	17:52	+127.3	18:24	19:03	19:43	23:51	11:59	1:00
26 Wed	04:00	04:41	05:20	05:52	-2.27	11:51	183.8	+8.8	11:58	1:00	-2.58	17:50	+139.6	18:22	19:01	19:41	23:51	12:03	1:00
27 Thu	04:02	04:42	05:21	05:53	-2.89	11:51	184.8	+9.1	11:54	1:00	-3.20	17:48	+151.7	18:19	18:58	19:38	23:51	12:07	1:01
28 Fri	04:04	04:44	05:23	05:55	-3.52	11:51	185.8	+9.5	11:50	0:59	-3.83	17:45	+163.7	18:17	18:56	19:36	23:50	12:11	1:01
29 Sat	04:06	04:46	05:25	05:56	-4.15	11:50	186.7	+9.8	11:47	0:59	-4.45	17:43	+175.4	18:15	18:53	19:33	23:50	12:15	1:01
30 Sun	04:08	04:47	05:26	05:58	-4.77	11:50	187.7	+10.1	11:43	0:59	-5.07	17:41	-173.1	18:12	18:51	19:31	23:50	12:19	1:02

° Solar Longitude [Sun Long] and Equation of Time [EoT, in minutes] are as of Mid Day = Local Apparent Noon.
° Sunrise/Sunset Azimuth [Rise/Set Az] relative to true east/west with center of Sun at horizon. Moon Phase at Sunset.

Note Twilight Solar Depressions: Civil = 6° (see brightest stars, aviation end or start of night, then artificial lights for outdoor activities),
Nautical [Sea] = 12° (horizon no longer visible at sea), Astronomical [Astro] = 18° (minimal atmospheric scatter of sunlight).

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