CUCBC

Cambridge University Combined Boat Clubs

Hours of Darkness

No College crew is permitted to be on the water before Lighting Down or after Lighting Up. Crews on the water within 15 minutes of lighting up or lighting down must have static white lights (clearly visible) attached to both the bow and stern of the boat.

Lighting Up and Down times for 2012 are listed in the table below. All of the times are adjusted to BST where applicable. The lighting times for today and tomorrow are available on a WAP phone (http://m.cucbc.org/lighting).

Lighting down is defined as the time when the sun rises to 95° below the zenith, whilst lighting up is the time at which the sun sets to 94° below the zenith.

Day	Date	Lighting Down	Lighting Up
Saturday	04/02/2012	07:06	17:15
Sunday	05/02/2012	07:04	17:16
Monday	06/02/2012	07:03	17:18
Tuesday	07/02/2012	07:01	17:20
Wednesday	08/02/2012	06:59	17:22
Thursday	09/02/2012	06:58	17:24
Friday	10/02/2012	06:56	17:25
Saturday	11/02/2012	06:54	17:27
Sunday	12/02/2012	06:52	17:29
Monday	13/02/2012	06:51	17:31
Tuesday	14/02/2012	06:49	17:33
Wednesday	15/02/2012	06:47	17:34
Thursday	16/02/2012	06:45	17:36
Friday	17/02/2012	06:43	17:38
Saturday	18/02/2012	06:41	17:40
Sunday	19/02/2012	06:39	17:42
Monday	20/02/2012	06:37	17:43
Tuesday	21/02/2012	06:35	17:45
Wednesday	22/02/2012	06:33	17:47
Thursday	23/02/2012	06:31	17:49
Friday	24/02/2012	06:29	17:51
Saturday	25/02/2012	06:27	17:52
Sunday	26/02/2012	06:25	17:54
Monday	27/02/2012	06:23	17:56
Tuesday	28/02/2012	06:21	17:58
Wednesday	29/02/2012	06:18	18:00
Thursday	01/03/2012	06:16	18:01
Friday	02/03/2012	06:14	18:03
Saturday	03/03/2012	06:12	18:05
Sunday	04/03/2012	06:10	18:07
Monday	05/03/2012	06:07	18:08
Tuesday	06/03/2012	06:05	18:10
Wednesday	07/03/2012	06:03	18:12
Thursday	08/03/2012	06:01	18:14
Friday	09/03/2012	05:58	18:16
Saturday	10/03/2012	05:56	18:17
Sunday	11/03/2012	05:54	18:19
Monday	12/03/2012	05:52	18:21
Tuesday	13/03/2012	05:49	18:23
Wednesday	14/03/2012	05:47	18:24
Thursday	15/03/2012	05:45	18:26
Friday	16/03/2012	05:42	18:28
Saturday	17/03/2012	05:40	18:30
Sunday	18/03/2012	05:38	18:31
Monday	19/03/2012	05:35	18:33
Tuesday	20/03/2012	05:33	18:35
Wednesday	21/03/2012	05:31	18:37
Thursday	22/03/2012	05:28	18:38
Friday	23/03/2012	05:26	18:40
Saturday	24/03/2012	05:24	18:42
Sunday	25/03/2012	06:21	19:44
Monday	26/03/2012	06:19	19:45
Tuesday	27/03/2012	06:16	19:47
Wednesday	28/03/2012	06:14	19:49
Thursday	29/03/2012	06:12	19:51
Friday	30/03/2012	06:09	19:53
Saturday	31/03/2012	06:07	19:54
Sunday	01/04/2012	06:05	19:56
Monday	02/04/2012	06:02	19:58
Tuesday	03/04/2012	06:00	20:00
Wednesday	04/04/2012	05:57	20:01
Thursday	05/04/2012	05:55	20:03
Friday	06/04/2012	05:53	20:05
Saturday	07/04/2012	05:50	20:07
Sunday	08/04/2012	05:48	20:09
Monday	09/04/2012	05:46	20:10
Tuesday	10/04/2012	05:43	20:12
Wednesday	11/04/2012	05:41	20:14
Thursday	12/04/2012	05:39	20:16
Friday	13/04/2012	05:36	20:18
Saturday	14/04/2012	05:34	20:19
Sunday	15/04/2012	05:32	20:21
Monday	16/04/2012	05:29	20:23
Tuesday	17/04/2012	05:27	20:25
Wednesday	18/04/2012	05:25	20:27
Thursday	19/04/2012	05:22	20:28
Friday	20/04/2012	05:20	20:30
Saturday	21/04/2012	05:18	20:32
Sunday	22/04/2012	05:16	20:34
Monday	23/04/2012	05:13	20:36
Tuesday	24/04/2012	05:11	20:38
Wednesday	25/04/2012	05:09	20:39
Thursday	26/04/2012	05:07	20:41
Friday	27/04/2012	05:05	20:43
Saturday	28/04/2012	05:03	20:45
Sunday	29/04/2012	05:00	20:47
Monday	30/04/2012	04:58	20:48
Tuesday	01/05/2012	04:56	20:50
Wednesday	02/05/2012	04:54	20:52
Thursday	03/05/2012	04:52	20:54
Friday	04/05/2012	04:50	20:56
Saturday	05/05/2012	04:48	20:57
Sunday	06/05/2012	04:46	20:59
Monday	07/05/2012	04:44	21:01
Tuesday	08/05/2012	04:42	21:03
Wednesday	09/05/2012	04:40	21:05
Thursday	10/05/2012	04:38	21:06
Friday	11/05/2012	04:37	21:08
Saturday	12/05/2012	04:35	21:10
Sunday	13/05/2012	04:33	21:12
Monday	14/05/2012	04:31	21:13
Tuesday	15/05/2012	04:29	21:15
Wednesday	16/05/2012	04:28	21:17
Thursday	17/05/2012	04:26	21:18
Friday	18/05/2012	04:24	21:20
Saturday	19/05/2012	04:23	21:21
Sunday	20/05/2012	04:21	21:23
Monday	21/05/2012	04:20	21:25
Tuesday	22/05/2012	04:18	21:26
Wednesday	23/05/2012	04:17	21:28
Thursday	24/05/2012	04:16	21:29
Friday	25/05/2012	04:14	21:31
Saturday	26/05/2012	04:13	21:32
Sunday	27/05/2012	04:12	21:33
Monday	28/05/2012	04:11	21:35
Tuesday	29/05/2012	04:09	21:36
Wednesday	30/05/2012	04:08	21:37
Thursday	31/05/2012	04:07	21:39
Friday	01/06/2012	04:06	21:40
Saturday	02/06/2012	04:05	21:41
Sunday	03/06/2012	04:05	21:42
Monday	04/06/2012	04:04	21:43
Tuesday	05/06/2012	04:03	21:44
Wednesday	06/06/2012	04:02	21:45
Thursday	07/06/2012	04:02	21:46
Friday	08/06/2012	04:01	21:47
Saturday	09/06/2012	04:01	21:48
Sunday	10/06/2012	04:00	21:49
Monday	11/06/2012	04:00	21:50
Tuesday	12/06/2012	03:59	21:50
Wednesday	13/06/2012	03:59	21:51
Thursday	14/06/2012	03:59	21:51
Friday	15/06/2012	03:59	21:52
Saturday	16/06/2012	03:59	21:52
Sunday	17/06/2012	03:59	21:53
Monday	18/06/2012	03:59	21:53
Tuesday	19/06/2012	03:59	21:53
Wednesday	20/06/2012	03:59	21:54
Thursday	21/06/2012	03:59	21:54
Friday	22/06/2012	03:59	21:54
Saturday	23/06/2012	04:00	21:54
Sunday	24/06/2012	04:00	21:54
Monday	25/06/2012	04:01	21:54
Tuesday	26/06/2012	04:01	21:54
Wednesday	27/06/2012	04:02	21:54
Thursday	28/06/2012	04:02	21:53
Friday	29/06/2012	04:03	21:53
Saturday	30/06/2012	04:04	21:53
Sunday	01/07/2012	04:05	21:52
Monday	02/07/2012	04:06	21:52
Tuesday	03/07/2012	04:06	21:51
Wednesday	04/07/2012	04:07	21:50
Thursday	05/07/2012	04:08	21:50
Friday	06/07/2012	04:09	21:49
Saturday	07/07/2012	04:11	21:48
Sunday	08/07/2012	04:12	21:47
Monday	09/07/2012	04:13	21:47
Tuesday	10/07/2012	04:14	21:46
Wednesday	11/07/2012	04:15	21:45
Thursday	12/07/2012	04:17	21:44
Friday	13/07/2012	04:18	21:42
Saturday	14/07/2012	04:20	21:41
Sunday	15/07/2012	04:21	21:40
Monday	16/07/2012	04:22	21:39
Tuesday	17/07/2012	04:24	21:38
Wednesday	18/07/2012	04:25	21:36
Thursday	19/07/2012	04:27	21:35
Friday	20/07/2012	04:28	21:33
Saturday	21/07/2012	04:30	21:32
Sunday	22/07/2012	04:32	21:30
Monday	23/07/2012	04:33	21:29
Tuesday	24/07/2012	04:35	21:27
Wednesday	25/07/2012	04:37	21:26
Thursday	26/07/2012	04:38	21:24
Friday	27/07/2012	04:40	21:22
Saturday	28/07/2012	04:42	21:21
Sunday	29/07/2012	04:43	21:19
Monday	30/07/2012	04:45	21:17
Tuesday	31/07/2012	04:47	21:15
Wednesday	01/08/2012	04:49	21:14
Thursday	02/08/2012	04:50	21:12
Friday	03/08/2012	04:52	21:10
Saturday	04/08/2012	04:54	21:08
Sunday	05/08/2012	04:56	21:06
Monday	06/08/2012	04:57	21:04
Tuesday	07/08/2012	04:59	21:02
Wednesday	08/08/2012	05:01	21:00
Thursday	09/08/2012	05:03	20:58
Friday	10/08/2012	05:05	20:56
Saturday	11/08/2012	05:06	20:54
Sunday	12/08/2012	05:08	20:52
Monday	13/08/2012	05:10	20:49
Tuesday	14/08/2012	05:12	20:47
Wednesday	15/08/2012	05:14	20:45
Thursday	16/08/2012	05:15	20:43
Friday	17/08/2012	05:17	20:41
Saturday	18/08/2012	05:19	20:39
Sunday	19/08/2012	05:21	20:36
Monday	20/08/2012	05:23	20:34
Tuesday	21/08/2012	05:24	20:32
Wednesday	22/08/2012	05:26	20:30
Thursday	23/08/2012	05:28	20:27
Friday	24/08/2012	05:30	20:25
Saturday	25/08/2012	05:31	20:23
Sunday	26/08/2012	05:33	20:21
Monday	27/08/2012	05:35	20:18
Tuesday	28/08/2012	05:37	20:16
Wednesday	29/08/2012	05:38	20:14
Thursday	30/08/2012	05:40	20:11
Friday	31/08/2012	05:42	20:09
Saturday	01/09/2012	05:44	20:07
Sunday	02/09/2012	05:45	20:04
Monday	03/09/2012	05:47	20:02
Tuesday	04/09/2012	05:49	19:59
Wednesday	05/09/2012	05:51	19:57
Thursday	06/09/2012	05:52	19:55
Friday	07/09/2012	05:54	19:52
Saturday	08/09/2012	05:56	19:50
Sunday	09/09/2012	05:57	19:48
Monday	10/09/2012	05:59	19:45
Tuesday	11/09/2012	06:01	19:43
Wednesday	12/09/2012	06:03	19:40
Thursday	13/09/2012	06:04	19:38
Friday	14/09/2012	06:06	19:36
Saturday	15/09/2012	06:08	19:33
Sunday	16/09/2012	06:09	19:31
Monday	17/09/2012	06:11	19:28
Tuesday	18/09/2012	06:13	19:26
Wednesday	19/09/2012	06:14	19:24
Thursday	20/09/2012	06:16	19:21
Friday	21/09/2012	06:18	19:19
Saturday	22/09/2012	06:19	19:17
Sunday	23/09/2012	06:21	19:14
Monday	24/09/2012	06:23	19:12
Tuesday	25/09/2012	06:24	19:10
Wednesday	26/09/2012	06:26	19:07
Thursday	27/09/2012	06:28	19:05
Friday	28/09/2012	06:30	19:03
Saturday	29/09/2012	06:31	19:00
Sunday	30/09/2012	06:33	18:58
Monday	01/10/2012	06:35	18:56
Tuesday	02/10/2012	06:36	18:53
Wednesday	03/10/2012	06:38	18:51
Thursday	04/10/2012	06:40	18:49
Friday	05/10/2012	06:41	18:46
Saturday	06/10/2012	06:43	18:44
Sunday	07/10/2012	06:45	18:42
Monday	08/10/2012	06:46	18:40
Tuesday	09/10/2012	06:48	18:37
Wednesday	10/10/2012	06:50	18:35
Thursday	11/10/2012	06:51	18:33
Friday	12/10/2012	06:53	18:31
Saturday	13/10/2012	06:55	18:29
Sunday	14/10/2012	06:56	18:27
Monday	15/10/2012	06:58	18:24
Tuesday	16/10/2012	07:00	18:22
Wednesday	17/10/2012	07:02	18:20
Thursday	18/10/2012	07:03	18:18
Friday	19/10/2012	07:05	18:16
Saturday	20/10/2012	07:07	18:14
Sunday	21/10/2012	07:08	18:12
Monday	22/10/2012	07:10	18:10
Tuesday	23/10/2012	07:12	18:08
Wednesday	24/10/2012	07:14	18:06
Thursday	25/10/2012	07:15	18:04
Friday	26/10/2012	07:17	18:02
Saturday	27/10/2012	07:19	18:00
Sunday	28/10/2012	06:20	16:58
Monday	29/10/2012	06:22	16:56
Tuesday	30/10/2012	06:24	16:55
Wednesday	31/10/2012	06:26	16:53
Thursday	01/11/2012	06:27	16:51
Friday	02/11/2012	06:29	16:49
Saturday	03/11/2012	06:31	16:48
Sunday	04/11/2012	06:32	16:46
Monday	05/11/2012	06:34	16:44
Tuesday	06/11/2012	06:36	16:43
Wednesday	07/11/2012	06:38	16:41
Thursday	08/11/2012	06:39	16:40
Friday	09/11/2012	06:41	16:38
Saturday	10/11/2012	06:43	16:37
Sunday	11/11/2012	06:44	16:35
Monday	12/11/2012	06:46	16:34
Tuesday	13/11/2012	06:48	16:32
Wednesday	14/11/2012	06:49	16:31
Thursday	15/11/2012	06:51	16:30
Friday	16/11/2012	06:53	16:28
Saturday	17/11/2012	06:54	16:27
Sunday	18/11/2012	06:56	16:26
Monday	19/11/2012	06:57	16:25
Tuesday	20/11/2012	06:59	16:24
Wednesday	21/11/2012	07:00	16:23
Thursday	22/11/2012	07:02	16:22
Friday	23/11/2012	07:03	16:21
Saturday	24/11/2012	07:05	16:20
Sunday	25/11/2012	07:06	16:19
Monday	26/11/2012	07:08	16:18
Tuesday	27/11/2012	07:09	16:18
Wednesday	28/11/2012	07:11	16:17
Thursday	29/11/2012	07:12	16:16
Friday	30/11/2012	07:13	16:16
Saturday	01/12/2012	07:15	16:15
Sunday	02/12/2012	07:16	16:14
Monday	03/12/2012	07:17	16:14
Tuesday	04/12/2012	07:19	16:14
Wednesday	05/12/2012	07:20	16:13
Thursday	06/12/2012	07:21	16:13
Friday	07/12/2012	07:22	16:13
Saturday	08/12/2012	07:23	16:13
Sunday	09/12/2012	07:24	16:12
Monday	10/12/2012	07:25	16:12
Tuesday	11/12/2012	07:26	16:12
Wednesday	12/12/2012	07:27	16:12
Thursday	13/12/2012	07:28	16:12
Friday	14/12/2012	07:29	16:13
Saturday	15/12/2012	07:30	16:13
Sunday	16/12/2012	07:30	16:13
Monday	17/12/2012	07:31	16:13
Tuesday	18/12/2012	07:32	16:14
Wednesday	19/12/2012	07:32	16:14
Thursday	20/12/2012	07:33	16:14
Friday	21/12/2012	07:33	16:15
Saturday	22/12/2012	07:34	16:16
Sunday	23/12/2012	07:34	16:16
Monday	24/12/2012	07:34	16:17
Tuesday	25/12/2012	07:35	16:17
Wednesday	26/12/2012	07:35	16:18
Thursday	27/12/2012	07:35	16:19
Friday	28/12/2012	07:35	16:20
Saturday	29/12/2012	07:35	16:21
Sunday	30/12/2012	07:36	16:22
Monday	31/12/2012	07:35	16:23

XML and CSV files of the hours of darkness for the current year are available. Other webmasters may wish to use these to display the lighting up and down times on their own websites.

» XML Data for 2012
» CSV Data for 2012