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 2018 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
Friday19/01/201807:2616:48
Saturday20/01/201807:2516:50
Sunday21/01/201807:2416:51
Monday22/01/201807:2316:53
Tuesday23/01/201807:2216:55
Wednesday24/01/201807:2016:56
Thursday25/01/201807:1916:58
Friday26/01/201807:1817:00
Saturday27/01/201807:1717:01
Sunday28/01/201807:1517:03
Monday29/01/201807:1417:05
Tuesday30/01/201807:1317:07
Wednesday31/01/201807:1117:08
Thursday01/02/201807:1017:10
Friday02/02/201807:0817:12
Saturday03/02/201807:0717:14
Sunday04/02/201807:0517:16
Monday05/02/201807:0317:17
Tuesday06/02/201807:0217:19
Wednesday07/02/201807:0017:21
Thursday08/02/201806:5817:23
Friday09/02/201806:5717:25
Saturday10/02/201806:5517:26
Sunday11/02/201806:5317:28
Monday12/02/201806:5117:30
Tuesday13/02/201806:5017:32
Wednesday14/02/201806:4817:34
Thursday15/02/201806:4617:35
Friday16/02/201806:4417:37
Saturday17/02/201806:4217:39
Sunday18/02/201806:4017:41
Monday19/02/201806:3817:43
Tuesday20/02/201806:3617:44
Wednesday21/02/201806:3417:46
Thursday22/02/201806:3217:48
Friday23/02/201806:3017:50
Saturday24/02/201806:2817:52
Sunday25/02/201806:2617:53
Monday26/02/201806:2417:55
Tuesday27/02/201806:2217:57
Wednesday28/02/201806:1917:59
Thursday01/03/201806:1718:01
Friday02/03/201806:1518:02
Saturday03/03/201806:1318:04
Sunday04/03/201806:1118:06
Monday05/03/201806:0818:08
Tuesday06/03/201806:0618:09
Wednesday07/03/201806:0418:11
Thursday08/03/201806:0218:13
Friday09/03/201806:0018:15
Saturday10/03/201805:5718:17
Sunday11/03/201805:5518:18
Monday12/03/201805:5318:20
Tuesday13/03/201805:5018:22
Wednesday14/03/201805:4818:24
Thursday15/03/201805:4618:25
Friday16/03/201805:4318:27
Saturday17/03/201805:4118:29
Sunday18/03/201805:3918:31
Monday19/03/201805:3618:32
Tuesday20/03/201805:3418:34
Wednesday21/03/201805:3218:36
Thursday22/03/201805:2918:38
Friday23/03/201805:2718:39
Saturday24/03/201805:2518:41
Sunday25/03/201806:2219:43
Monday26/03/201806:2019:45
Tuesday27/03/201806:1719:46
Wednesday28/03/201806:1519:48
Thursday29/03/201806:1319:50
Friday30/03/201806:1019:52
Saturday31/03/201806:0819:54
Sunday01/04/201806:0619:55
Monday02/04/201806:0319:57
Tuesday03/04/201806:0119:59
Wednesday04/04/201805:5820:01
Thursday05/04/201805:5620:02
Friday06/04/201805:5420:04
Saturday07/04/201805:5120:06
Sunday08/04/201805:4920:08
Monday09/04/201805:4720:10
Tuesday10/04/201805:4420:11
Wednesday11/04/201805:4220:13
Thursday12/04/201805:4020:15
Friday13/04/201805:3720:17
Saturday14/04/201805:3520:19
Sunday15/04/201805:3320:20
Monday16/04/201805:3020:22
Tuesday17/04/201805:2820:24
Wednesday18/04/201805:2620:26
Thursday19/04/201805:2320:28
Friday20/04/201805:2120:29
Saturday21/04/201805:1920:31
Sunday22/04/201805:1720:33
Monday23/04/201805:1420:35
Tuesday24/04/201805:1220:37
Wednesday25/04/201805:1020:39
Thursday26/04/201805:0820:40
Friday27/04/201805:0620:42
Saturday28/04/201805:0420:44
Sunday29/04/201805:0120:46
Monday30/04/201804:5920:48
Tuesday01/05/201804:5720:49
Wednesday02/05/201804:5520:51
Thursday03/05/201804:5320:53
Friday04/05/201804:5120:55
Saturday05/05/201804:4920:57
Sunday06/05/201804:4720:58
Monday07/05/201804:4521:00
Tuesday08/05/201804:4321:02
Wednesday09/05/201804:4121:04
Thursday10/05/201804:3921:06
Friday11/05/201804:3721:07
Saturday12/05/201804:3621:09
Sunday13/05/201804:3421:11
Monday14/05/201804:3221:12
Tuesday15/05/201804:3021:14
Wednesday16/05/201804:2921:16
Thursday17/05/201804:2721:17
Friday18/05/201804:2521:19
Saturday19/05/201804:2421:21
Sunday20/05/201804:2221:22
Monday21/05/201804:2121:24
Tuesday22/05/201804:1921:25
Wednesday23/05/201804:1821:27
Thursday24/05/201804:1621:29
Friday25/05/201804:1521:30
Saturday26/05/201804:1421:31
Sunday27/05/201804:1221:33
Monday28/05/201804:1121:34
Tuesday29/05/201804:1021:36
Wednesday30/05/201804:0921:37
Thursday31/05/201804:0821:38
Friday01/06/201804:0721:39
Saturday02/06/201804:0621:41
Sunday03/06/201804:0521:42
Monday04/06/201804:0421:43
Tuesday05/06/201804:0321:44
Wednesday06/06/201804:0321:45
Thursday07/06/201804:0221:46
Friday08/06/201804:0121:47
Saturday09/06/201804:0121:48
Sunday10/06/201804:0021:48
Monday11/06/201804:0021:49
Tuesday12/06/201803:5921:50
Wednesday13/06/201803:5921:51
Thursday14/06/201803:5921:51
Friday15/06/201803:5921:52
Saturday16/06/201803:5921:52
Sunday17/06/201803:5921:53
Monday18/06/201803:5921:53
Tuesday19/06/201803:5921:53
Wednesday20/06/201803:5921:54
Thursday21/06/201803:5921:54
Friday22/06/201803:5921:54
Saturday23/06/201804:0021:54
Sunday24/06/201804:0021:54
Monday25/06/201804:0021:54
Tuesday26/06/201804:0121:54
Wednesday27/06/201804:0121:54
Thursday28/06/201804:0221:53
Friday29/06/201804:0321:53
Saturday30/06/201804:0421:53
Sunday01/07/201804:0421:52
Monday02/07/201804:0521:52
Tuesday03/07/201804:0621:51
Wednesday04/07/201804:0721:51
Thursday05/07/201804:0821:50
Friday06/07/201804:0921:49
Saturday07/07/201804:1021:49
Sunday08/07/201804:1121:48
Monday09/07/201804:1221:47
Tuesday10/07/201804:1421:46
Wednesday11/07/201804:1521:45
Thursday12/07/201804:1621:44
Friday13/07/201804:1821:43
Saturday14/07/201804:1921:42
Sunday15/07/201804:2021:41
Monday16/07/201804:2221:39
Tuesday17/07/201804:2321:38
Wednesday18/07/201804:2521:37
Thursday19/07/201804:2621:35
Friday20/07/201804:2821:34
Saturday21/07/201804:2921:33
Sunday22/07/201804:3121:31
Monday23/07/201804:3321:30
Tuesday24/07/201804:3421:28
Wednesday25/07/201804:3621:26
Thursday26/07/201804:3821:25
Friday27/07/201804:3921:23
Saturday28/07/201804:4121:21
Sunday29/07/201804:4321:20
Monday30/07/201804:4421:18
Tuesday31/07/201804:4621:16
Wednesday01/08/201804:4821:14
Thursday02/08/201804:5021:12
Friday03/08/201804:5121:11
Saturday04/08/201804:5321:09
Sunday05/08/201804:5521:07
Monday06/08/201804:5721:05
Tuesday07/08/201804:5821:03
Wednesday08/08/201805:0021:01
Thursday09/08/201805:0220:59
Friday10/08/201805:0420:57
Saturday11/08/201805:0620:55
Sunday12/08/201805:0720:53
Monday13/08/201805:0920:50
Tuesday14/08/201805:1120:48
Wednesday15/08/201805:1320:46
Thursday16/08/201805:1520:44
Friday17/08/201805:1620:42
Saturday18/08/201805:1820:40
Sunday19/08/201805:2020:37
Monday20/08/201805:2220:35
Tuesday21/08/201805:2420:33
Wednesday22/08/201805:2520:31
Thursday23/08/201805:2720:28
Friday24/08/201805:2920:26
Saturday25/08/201805:3120:24
Sunday26/08/201805:3220:22
Monday27/08/201805:3420:19
Tuesday28/08/201805:3620:17
Wednesday29/08/201805:3820:15
Thursday30/08/201805:3920:12
Friday31/08/201805:4120:10
Saturday01/09/201805:4320:08
Sunday02/09/201805:4520:05
Monday03/09/201805:4620:03
Tuesday04/09/201805:4820:01
Wednesday05/09/201805:5019:58
Thursday06/09/201805:5219:56
Friday07/09/201805:5319:53
Saturday08/09/201805:5519:51
Sunday09/09/201805:5719:49
Monday10/09/201805:5819:46
Tuesday11/09/201806:0019:44
Wednesday12/09/201806:0219:42
Thursday13/09/201806:0419:39
Friday14/09/201806:0519:37
Saturday15/09/201806:0719:34
Sunday16/09/201806:0919:32
Monday17/09/201806:1019:30
Tuesday18/09/201806:1219:27
Wednesday19/09/201806:1419:25
Thursday20/09/201806:1519:22
Friday21/09/201806:1719:20
Saturday22/09/201806:1919:18
Sunday23/09/201806:2019:15
Monday24/09/201806:2219:13
Tuesday25/09/201806:2419:11
Wednesday26/09/201806:2519:08
Thursday27/09/201806:2719:06
Friday28/09/201806:2919:04
Saturday29/09/201806:3019:01
Sunday30/09/201806:3218:59
Monday01/10/201806:3418:57
Tuesday02/10/201806:3518:54
Wednesday03/10/201806:3718:52
Thursday04/10/201806:3918:50
Friday05/10/201806:4118:47
Saturday06/10/201806:4218:45
Sunday07/10/201806:4418:43
Monday08/10/201806:4618:41
Tuesday09/10/201806:4718:38
Wednesday10/10/201806:4918:36
Thursday11/10/201806:5118:34
Friday12/10/201806:5218:32
Saturday13/10/201806:5418:30
Sunday14/10/201806:5618:28
Monday15/10/201806:5718:25
Tuesday16/10/201806:5918:23
Wednesday17/10/201807:0118:21
Thursday18/10/201807:0318:19
Friday19/10/201807:0418:17
Saturday20/10/201807:0618:15
Sunday21/10/201807:0818:13
Monday22/10/201807:0918:11
Tuesday23/10/201807:1118:09
Wednesday24/10/201807:1318:07
Thursday25/10/201807:1518:05
Friday26/10/201807:1618:03
Saturday27/10/201807:1818:01
Sunday28/10/201806:2016:59
Monday29/10/201806:2116:57
Tuesday30/10/201806:2316:55
Wednesday31/10/201806:2516:54
Thursday01/11/201806:2716:52
Friday02/11/201806:2816:50
Saturday03/11/201806:3016:48
Sunday04/11/201806:3216:47
Monday05/11/201806:3316:45
Tuesday06/11/201806:3516:43
Wednesday07/11/201806:3716:42
Thursday08/11/201806:3816:40
Friday09/11/201806:4016:39
Saturday10/11/201806:4216:37
Sunday11/11/201806:4416:36
Monday12/11/201806:4516:34
Tuesday13/11/201806:4716:33
Wednesday14/11/201806:4916:32
Thursday15/11/201806:5016:30
Friday16/11/201806:5216:29
Saturday17/11/201806:5316:28
Sunday18/11/201806:5516:27
Monday19/11/201806:5716:25
Tuesday20/11/201806:5816:24
Wednesday21/11/201807:0016:23
Thursday22/11/201807:0116:22
Friday23/11/201807:0316:21
Saturday24/11/201807:0416:20
Sunday25/11/201807:0616:20
Monday26/11/201807:0716:19
Tuesday27/11/201807:0916:18
Wednesday28/11/201807:1016:17
Thursday29/11/201807:1116:16
Friday30/11/201807:1316:16
Saturday01/12/201807:1416:15
Sunday02/12/201807:1516:15
Monday03/12/201807:1716:14
Tuesday04/12/201807:1816:14
Wednesday05/12/201807:1916:13
Thursday06/12/201807:2016:13
Friday07/12/201807:2116:13
Saturday08/12/201807:2316:13
Sunday09/12/201807:2416:12
Monday10/12/201807:2516:12
Tuesday11/12/201807:2616:12
Wednesday12/12/201807:2716:12
Thursday13/12/201807:2716:12
Friday14/12/201807:2816:12
Saturday15/12/201807:2916:13
Sunday16/12/201807:3016:13
Monday17/12/201807:3116:13
Tuesday18/12/201807:3116:13
Wednesday19/12/201807:3216:14
Thursday20/12/201807:3216:14
Friday21/12/201807:3316:15
Saturday22/12/201807:3316:15
Sunday23/12/201807:3416:16
Monday24/12/201807:3416:16
Tuesday25/12/201807:3516:17
Wednesday26/12/201807:3516:18
Thursday27/12/201807:3516:19
Friday28/12/201807:3516:20
Saturday29/12/201807:3516:20
Sunday30/12/201807:3516:21
Monday31/12/201807:3516:22

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 2018
» CSV Data for 2018

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