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 2017 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.

DayDateLighting DownLighting Up
Sunday22/01/201707:2216:53
Monday23/01/201707:2116:55
Tuesday24/01/201707:2016:57
Wednesday25/01/201707:1916:58
Thursday26/01/201707:1817:00
Friday27/01/201707:1617:02
Saturday28/01/201707:1517:04
Sunday29/01/201707:1417:05
Monday30/01/201707:1217:07
Tuesday31/01/201707:1117:09
Wednesday01/02/201707:0917:11
Thursday02/02/201707:0817:12
Friday03/02/201707:0617:14
Saturday04/02/201707:0517:16
Sunday05/02/201707:0317:18
Monday06/02/201707:0117:20
Tuesday07/02/201707:0017:21
Wednesday08/02/201706:5817:23
Thursday09/02/201706:5617:25
Friday10/02/201706:5517:27
Saturday11/02/201706:5317:29
Sunday12/02/201706:5117:30
Monday13/02/201706:4917:32
Tuesday14/02/201706:4717:34
Wednesday15/02/201706:4517:36
Thursday16/02/201706:4317:38
Friday17/02/201706:4217:39
Saturday18/02/201706:4017:41
Sunday19/02/201706:3817:43
Monday20/02/201706:3617:45
Tuesday21/02/201706:3417:47
Wednesday22/02/201706:3217:48
Thursday23/02/201706:2917:50
Friday24/02/201706:2717:52
Saturday25/02/201706:2517:54
Sunday26/02/201706:2317:56
Monday27/02/201706:2117:57
Tuesday28/02/201706:1917:59
Wednesday01/03/201706:1718:01
Thursday02/03/201706:1518:03
Friday03/03/201706:1218:05
Saturday04/03/201706:1018:06
Sunday05/03/201706:0818:08
Monday06/03/201706:0618:10
Tuesday07/03/201706:0318:12
Wednesday08/03/201706:0118:13
Thursday09/03/201705:5918:15
Friday10/03/201705:5718:17
Saturday11/03/201705:5418:19
Sunday12/03/201705:5218:20
Monday13/03/201705:5018:22
Tuesday14/03/201705:4718:24
Wednesday15/03/201705:4518:26
Thursday16/03/201705:4318:28
Friday17/03/201705:4118:29
Saturday18/03/201705:3818:31
Sunday19/03/201705:3618:33
Monday20/03/201705:3318:35
Tuesday21/03/201705:3118:36
Wednesday22/03/201705:2918:38
Thursday23/03/201705:2618:40
Friday24/03/201705:2418:42
Saturday25/03/201705:2218:43
Sunday26/03/201706:1919:45
Monday27/03/201706:1719:47
Tuesday28/03/201706:1519:49
Wednesday29/03/201706:1219:50
Thursday30/03/201706:1019:52
Friday31/03/201706:0719:54
Saturday01/04/201706:0519:56
Sunday02/04/201706:0319:57
Monday03/04/201706:0019:59
Tuesday04/04/201705:5820:01
Wednesday05/04/201705:5620:03
Thursday06/04/201705:5320:05
Friday07/04/201705:5120:06
Saturday08/04/201705:4820:08
Sunday09/04/201705:4620:10
Monday10/04/201705:4420:12
Tuesday11/04/201705:4120:14
Wednesday12/04/201705:3920:15
Thursday13/04/201705:3720:17
Friday14/04/201705:3420:19
Saturday15/04/201705:3220:21
Sunday16/04/201705:3020:23
Monday17/04/201705:2720:24
Tuesday18/04/201705:2520:26
Wednesday19/04/201705:2320:28
Thursday20/04/201705:2120:30
Friday21/04/201705:1820:32
Saturday22/04/201705:1620:34
Sunday23/04/201705:1420:35
Monday24/04/201705:1220:37
Tuesday25/04/201705:0920:39
Wednesday26/04/201705:0720:41
Thursday27/04/201705:0520:43
Friday28/04/201705:0320:44
Saturday29/04/201705:0120:46
Sunday30/04/201704:5920:48
Monday01/05/201704:5720:50
Tuesday02/05/201704:5520:52
Wednesday03/05/201704:5220:54
Thursday04/05/201704:5020:55
Friday05/05/201704:4820:57
Saturday06/05/201704:4620:59
Sunday07/05/201704:4521:01
Monday08/05/201704:4321:02
Tuesday09/05/201704:4121:04
Wednesday10/05/201704:3921:06
Thursday11/05/201704:3721:08
Friday12/05/201704:3521:09
Saturday13/05/201704:3321:11
Sunday14/05/201704:3221:13
Monday15/05/201704:3021:15
Tuesday16/05/201704:2821:16
Wednesday17/05/201704:2621:18
Thursday18/05/201704:2521:20
Friday19/05/201704:2321:21
Saturday20/05/201704:2221:23
Sunday21/05/201704:2021:24
Monday22/05/201704:1921:26
Tuesday23/05/201704:1721:27
Wednesday24/05/201704:1621:29
Thursday25/05/201704:1521:30
Friday26/05/201704:1321:32
Saturday27/05/201704:1221:33
Sunday28/05/201704:1121:35
Monday29/05/201704:1021:36
Tuesday30/05/201704:0921:37
Wednesday31/05/201704:0821:38
Thursday01/06/201704:0721:40
Friday02/06/201704:0621:41
Saturday03/06/201704:0521:42
Sunday04/06/201704:0421:43
Monday05/06/201704:0321:44
Tuesday06/06/201704:0221:45
Wednesday07/06/201704:0221:46
Thursday08/06/201704:0121:47
Friday09/06/201704:0121:48
Saturday10/06/201704:0021:49
Sunday11/06/201704:0021:49
Monday12/06/201703:5921:50
Tuesday13/06/201703:5921:51
Wednesday14/06/201703:5921:51
Thursday15/06/201703:5921:52
Friday16/06/201703:5921:52
Saturday17/06/201703:5921:53
Sunday18/06/201703:5921:53
Monday19/06/201703:5921:53
Tuesday20/06/201703:5921:54
Wednesday21/06/201703:5921:54
Thursday22/06/201703:5921:54
Friday23/06/201704:0021:54
Saturday24/06/201704:0021:54
Sunday25/06/201704:0121:54
Monday26/06/201704:0121:54
Tuesday27/06/201704:0221:54
Wednesday28/06/201704:0221:53
Thursday29/06/201704:0321:53
Friday30/06/201704:0421:53
Saturday01/07/201704:0421:52
Sunday02/07/201704:0521:52
Monday03/07/201704:0621:51
Tuesday04/07/201704:0721:51
Wednesday05/07/201704:0821:50
Thursday06/07/201704:0921:49
Friday07/07/201704:1021:48
Saturday08/07/201704:1221:48
Sunday09/07/201704:1321:47
Monday10/07/201704:1421:46
Tuesday11/07/201704:1521:45
Wednesday12/07/201704:1721:44
Thursday13/07/201704:1821:43
Friday14/07/201704:1921:42
Saturday15/07/201704:2121:40
Sunday16/07/201704:2221:39
Monday17/07/201704:2421:38
Tuesday18/07/201704:2521:37
Wednesday19/07/201704:2721:35
Thursday20/07/201704:2821:34
Friday21/07/201704:3021:32
Saturday22/07/201704:3121:31
Sunday23/07/201704:3321:29
Monday24/07/201704:3521:28
Tuesday25/07/201704:3621:26
Wednesday26/07/201704:3821:24
Thursday27/07/201704:4021:23
Friday28/07/201704:4121:21
Saturday29/07/201704:4321:19
Sunday30/07/201704:4521:18
Monday31/07/201704:4621:16
Tuesday01/08/201704:4821:14
Wednesday02/08/201704:5021:12
Thursday03/08/201704:5221:10
Friday04/08/201704:5421:08
Saturday05/08/201704:5521:06
Sunday06/08/201704:5721:04
Monday07/08/201704:5921:02
Tuesday08/08/201705:0121:00
Wednesday09/08/201705:0220:58
Thursday10/08/201705:0420:56
Friday11/08/201705:0620:54
Saturday12/08/201705:0820:52
Sunday13/08/201705:1020:50
Monday14/08/201705:1120:48
Tuesday15/08/201705:1320:46
Wednesday16/08/201705:1520:43
Thursday17/08/201705:1720:41
Friday18/08/201705:1920:39
Saturday19/08/201705:2020:37
Sunday20/08/201705:2220:35
Monday21/08/201705:2420:32
Tuesday22/08/201705:2620:30
Wednesday23/08/201705:2820:28
Thursday24/08/201705:2920:26
Friday25/08/201705:3120:23
Saturday26/08/201705:3320:21
Sunday27/08/201705:3520:19
Monday28/08/201705:3620:16
Tuesday29/08/201705:3820:14
Wednesday30/08/201705:4020:12
Thursday31/08/201705:4220:09
Friday01/09/201705:4320:07
Saturday02/09/201705:4520:05
Sunday03/09/201705:4720:02
Monday04/09/201705:4920:00
Tuesday05/09/201705:5019:58
Wednesday06/09/201705:5219:55
Thursday07/09/201705:5419:53
Friday08/09/201705:5519:50
Saturday09/09/201705:5719:48
Sunday10/09/201705:5919:46
Monday11/09/201706:0119:43
Tuesday12/09/201706:0219:41
Wednesday13/09/201706:0419:39
Thursday14/09/201706:0619:36
Friday15/09/201706:0719:34
Saturday16/09/201706:0919:31
Sunday17/09/201706:1119:29
Monday18/09/201706:1219:27
Tuesday19/09/201706:1419:24
Wednesday20/09/201706:1619:22
Thursday21/09/201706:1719:19
Friday22/09/201706:1919:17
Saturday23/09/201706:2119:15
Sunday24/09/201706:2219:12
Monday25/09/201706:2419:10
Tuesday26/09/201706:2619:08
Wednesday27/09/201706:2719:05
Thursday28/09/201706:2919:03
Friday29/09/201706:3119:01
Saturday30/09/201706:3318:58
Sunday01/10/201706:3418:56
Monday02/10/201706:3618:54
Tuesday03/10/201706:3818:51
Wednesday04/10/201706:3918:49
Thursday05/10/201706:4118:47
Friday06/10/201706:4318:45
Saturday07/10/201706:4418:42
Sunday08/10/201706:4618:40
Monday09/10/201706:4818:38
Tuesday10/10/201706:4918:36
Wednesday11/10/201706:5118:34
Thursday12/10/201706:5318:31
Friday13/10/201706:5418:29
Saturday14/10/201706:5618:27
Sunday15/10/201706:5818:25
Monday16/10/201707:0018:23
Tuesday17/10/201707:0118:21
Wednesday18/10/201707:0318:19
Thursday19/10/201707:0518:16
Friday20/10/201707:0618:14
Saturday21/10/201707:0818:12
Sunday22/10/201707:1018:10
Monday23/10/201707:1118:08
Tuesday24/10/201707:1318:06
Wednesday25/10/201707:1518:04
Thursday26/10/201707:1718:03
Friday27/10/201707:1818:01
Saturday28/10/201707:2017:59
Sunday29/10/201706:2216:57
Monday30/10/201706:2416:55
Tuesday31/10/201706:2516:53
Wednesday01/11/201706:2716:51
Thursday02/11/201706:2916:50
Friday03/11/201706:3016:48
Saturday04/11/201706:3216:46
Sunday05/11/201706:3416:45
Monday06/11/201706:3516:43
Tuesday07/11/201706:3716:41
Wednesday08/11/201706:3916:40
Thursday09/11/201706:4116:38
Friday10/11/201706:4216:37
Saturday11/11/201706:4416:35
Sunday12/11/201706:4616:34
Monday13/11/201706:4716:33
Tuesday14/11/201706:4916:31
Wednesday15/11/201706:5116:30
Thursday16/11/201706:5216:29
Friday17/11/201706:5416:28
Saturday18/11/201706:5516:26
Sunday19/11/201706:5716:25
Monday20/11/201706:5916:24
Tuesday21/11/201707:0016:23
Wednesday22/11/201707:0216:22
Thursday23/11/201707:0316:21
Friday24/11/201707:0516:20
Saturday25/11/201707:0616:19
Sunday26/11/201707:0816:18
Monday27/11/201707:0916:18
Tuesday28/11/201707:1016:17
Wednesday29/11/201707:1216:16
Thursday30/11/201707:1316:16
Friday01/12/201707:1416:15
Saturday02/12/201707:1616:15
Sunday03/12/201707:1716:14
Monday04/12/201707:1816:14
Tuesday05/12/201707:1916:13
Wednesday06/12/201707:2116:13
Thursday07/12/201707:2216:13
Friday08/12/201707:2316:13
Saturday09/12/201707:2416:12
Sunday10/12/201707:2516:12
Monday11/12/201707:2616:12
Tuesday12/12/201707:2716:12
Wednesday13/12/201707:2816:12
Thursday14/12/201707:2916:12
Friday15/12/201707:2916:13
Saturday16/12/201707:3016:13
Sunday17/12/201707:3116:13
Monday18/12/201707:3116:14
Tuesday19/12/201707:3216:14
Wednesday20/12/201707:3316:14
Thursday21/12/201707:3316:15
Friday22/12/201707:3416:15
Saturday23/12/201707:3416:16
Sunday24/12/201707:3416:17
Monday25/12/201707:3516:17
Tuesday26/12/201707:3516:18
Wednesday27/12/201707:3516:19
Thursday28/12/201707:3516:20
Friday29/12/201707:3516:21
Saturday30/12/201707:3516:22
Sunday31/12/201707:3516:23

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 2017
» CSV Data for 2017

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