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 2019 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
Friday18/01/201907:2716:46
Saturday19/01/201907:2616:48
Sunday20/01/201907:2516:49
Monday21/01/201907:2416:51
Tuesday22/01/201907:2316:53
Wednesday23/01/201907:2216:54
Thursday24/01/201907:2116:56
Friday25/01/201907:1916:58
Saturday26/01/201907:1816:59
Sunday27/01/201907:1717:01
Monday28/01/201907:1617:03
Tuesday29/01/201907:1417:05
Wednesday30/01/201907:1317:06
Thursday31/01/201907:1117:08
Friday01/02/201907:1017:10
Saturday02/02/201907:0917:12
Sunday03/02/201907:0717:13
Monday04/02/201907:0517:15
Tuesday05/02/201907:0417:17
Wednesday06/02/201907:0217:19
Thursday07/02/201907:0117:21
Friday08/02/201906:5917:22
Saturday09/02/201906:5717:24
Sunday10/02/201906:5517:26
Monday11/02/201906:5417:28
Tuesday12/02/201906:5217:30
Wednesday13/02/201906:5017:31
Thursday14/02/201906:4817:33
Friday15/02/201906:4617:35
Saturday16/02/201906:4417:37
Sunday17/02/201906:4217:39
Monday18/02/201906:4017:40
Tuesday19/02/201906:3917:42
Wednesday20/02/201906:3717:44
Thursday21/02/201906:3517:46
Friday22/02/201906:3217:48
Saturday23/02/201906:3017:49
Sunday24/02/201906:2817:51
Monday25/02/201906:2617:53
Tuesday26/02/201906:2417:55
Wednesday27/02/201906:2217:57
Thursday28/02/201906:2017:58
Friday01/03/201906:1818:00
Saturday02/03/201906:1618:02
Sunday03/03/201906:1318:04
Monday04/03/201906:1118:05
Tuesday05/03/201906:0918:07
Wednesday06/03/201906:0718:09
Thursday07/03/201906:0518:11
Friday08/03/201906:0218:13
Saturday09/03/201906:0018:14
Sunday10/03/201905:5818:16
Monday11/03/201905:5618:18
Tuesday12/03/201905:5318:20
Wednesday13/03/201905:5118:21
Thursday14/03/201905:4918:23
Friday15/03/201905:4618:25
Saturday16/03/201905:4418:27
Sunday17/03/201905:4218:28
Monday18/03/201905:3918:30
Tuesday19/03/201905:3718:32
Wednesday20/03/201905:3518:34
Thursday21/03/201905:3218:35
Friday22/03/201905:3018:37
Saturday23/03/201905:2818:39
Sunday24/03/201905:2518:41
Monday25/03/201905:2318:42
Tuesday26/03/201905:2018:44
Wednesday27/03/201905:1818:46
Thursday28/03/201905:1618:48
Friday29/03/201905:1318:50
Saturday30/03/201905:1118:51
Sunday31/03/201906:0919:53
Monday01/04/201906:0619:55
Tuesday02/04/201906:0419:57
Wednesday03/04/201906:0119:58
Thursday04/04/201905:5920:00
Friday05/04/201905:5720:02
Saturday06/04/201905:5420:04
Sunday07/04/201905:5220:06
Monday08/04/201905:5020:07
Tuesday09/04/201905:4720:09
Wednesday10/04/201905:4520:11
Thursday11/04/201905:4320:13
Friday12/04/201905:4020:15
Saturday13/04/201905:3820:16
Sunday14/04/201905:3620:18
Monday15/04/201905:3320:20
Tuesday16/04/201905:3120:22
Wednesday17/04/201905:2920:24
Thursday18/04/201905:2620:25
Friday19/04/201905:2420:27
Saturday20/04/201905:2220:29
Sunday21/04/201905:1920:31
Monday22/04/201905:1720:33
Tuesday23/04/201905:1520:34
Wednesday24/04/201905:1320:36
Thursday25/04/201905:1120:38
Friday26/04/201905:0820:40
Saturday27/04/201905:0620:42
Sunday28/04/201905:0420:44
Monday29/04/201905:0220:45
Tuesday30/04/201905:0020:47
Wednesday01/05/201904:5820:49
Thursday02/05/201904:5620:51
Friday03/05/201904:5320:53
Saturday04/05/201904:5120:54
Sunday05/05/201904:4920:56
Monday06/05/201904:4720:58
Tuesday07/05/201904:4521:00
Wednesday08/05/201904:4421:02
Thursday09/05/201904:4221:03
Friday10/05/201904:4021:05
Saturday11/05/201904:3821:07
Sunday12/05/201904:3621:09
Monday13/05/201904:3421:10
Tuesday14/05/201904:3221:12
Wednesday15/05/201904:3121:14
Thursday16/05/201904:2921:15
Friday17/05/201904:2721:17
Saturday18/05/201904:2621:19
Sunday19/05/201904:2421:20
Monday20/05/201904:2221:22
Tuesday21/05/201904:2121:24
Wednesday22/05/201904:1921:25
Thursday23/05/201904:1821:27
Friday24/05/201904:1721:28
Saturday25/05/201904:1521:30
Sunday26/05/201904:1421:31
Monday27/05/201904:1321:33
Tuesday28/05/201904:1121:34
Wednesday29/05/201904:1021:35
Thursday30/05/201904:0921:37
Friday31/05/201904:0821:38
Saturday01/06/201904:0721:39
Sunday02/06/201904:0621:40
Monday03/06/201904:0521:41
Tuesday04/06/201904:0421:43
Wednesday05/06/201904:0421:44
Thursday06/06/201904:0321:45
Friday07/06/201904:0221:46
Saturday08/06/201904:0121:47
Sunday09/06/201904:0121:47
Monday10/06/201904:0021:48
Tuesday11/06/201904:0021:49
Wednesday12/06/201904:0021:50
Thursday13/06/201903:5921:50
Friday14/06/201903:5921:51
Saturday15/06/201903:5921:52
Sunday16/06/201903:5921:52
Monday17/06/201903:5921:53
Tuesday18/06/201903:5921:53
Wednesday19/06/201903:5921:53
Thursday20/06/201903:5921:54
Friday21/06/201903:5921:54
Saturday22/06/201903:5921:54
Sunday23/06/201903:5921:54
Monday24/06/201904:0021:54
Tuesday25/06/201904:0021:54
Wednesday26/06/201904:0121:54
Thursday27/06/201904:0121:54
Friday28/06/201904:0221:53
Saturday29/06/201904:0321:53
Sunday30/06/201904:0321:53
Monday01/07/201904:0421:52
Tuesday02/07/201904:0521:52
Wednesday03/07/201904:0621:51
Thursday04/07/201904:0721:51
Friday05/07/201904:0821:50
Saturday06/07/201904:0921:50
Sunday07/07/201904:1021:49
Monday08/07/201904:1121:48
Tuesday09/07/201904:1221:47
Wednesday10/07/201904:1321:46
Thursday11/07/201904:1521:45
Friday12/07/201904:1621:44
Saturday13/07/201904:1721:43
Sunday14/07/201904:1921:42
Monday15/07/201904:2021:41
Tuesday16/07/201904:2121:40
Wednesday17/07/201904:2321:38
Thursday18/07/201904:2421:37
Friday19/07/201904:2621:36
Saturday20/07/201904:2721:34
Sunday21/07/201904:2921:33
Monday22/07/201904:3121:32
Tuesday23/07/201904:3221:30
Wednesday24/07/201904:3421:28
Thursday25/07/201904:3521:27
Friday26/07/201904:3721:25
Saturday27/07/201904:3921:24
Sunday28/07/201904:4021:22
Monday29/07/201904:4221:20
Tuesday30/07/201904:4421:18
Wednesday31/07/201904:4621:17
Thursday01/08/201904:4721:15
Friday02/08/201904:4921:13
Saturday03/08/201904:5121:11
Sunday04/08/201904:5321:09
Monday05/08/201904:5421:07
Tuesday06/08/201904:5621:05
Wednesday07/08/201904:5821:03
Thursday08/08/201905:0021:01
Friday09/08/201905:0220:59
Saturday10/08/201905:0320:57
Sunday11/08/201905:0520:55
Monday12/08/201905:0720:53
Tuesday13/08/201905:0920:51
Wednesday14/08/201905:1120:49
Thursday15/08/201905:1220:47
Friday16/08/201905:1420:45
Saturday17/08/201905:1620:42
Sunday18/08/201905:1820:40
Monday19/08/201905:2020:38
Tuesday20/08/201905:2120:36
Wednesday21/08/201905:2320:33
Thursday22/08/201905:2520:31
Friday23/08/201905:2720:29
Saturday24/08/201905:2820:27
Sunday25/08/201905:3020:24
Monday26/08/201905:3220:22
Tuesday27/08/201905:3420:20
Wednesday28/08/201905:3520:18
Thursday29/08/201905:3720:15
Friday30/08/201905:3920:13
Saturday31/08/201905:4120:11
Sunday01/09/201905:4220:08
Monday02/09/201905:4420:06
Tuesday03/09/201905:4620:03
Wednesday04/09/201905:4820:01
Thursday05/09/201905:4919:59
Friday06/09/201905:5119:56
Saturday07/09/201905:5319:54
Sunday08/09/201905:5519:52
Monday09/09/201905:5619:49
Tuesday10/09/201905:5819:47
Wednesday11/09/201906:0019:44
Thursday12/09/201906:0119:42
Friday13/09/201906:0319:40
Saturday14/09/201906:0519:37
Sunday15/09/201906:0619:35
Monday16/09/201906:0819:33
Tuesday17/09/201906:1019:30
Wednesday18/09/201906:1219:28
Thursday19/09/201906:1319:25
Friday20/09/201906:1519:23
Saturday21/09/201906:1719:21
Sunday22/09/201906:1819:18
Monday23/09/201906:2019:16
Tuesday24/09/201906:2219:14
Wednesday25/09/201906:2319:11
Thursday26/09/201906:2519:09
Friday27/09/201906:2719:06
Saturday28/09/201906:2819:04
Sunday29/09/201906:3019:02
Monday30/09/201906:3218:59
Tuesday01/10/201906:3318:57
Wednesday02/10/201906:3518:55
Thursday03/10/201906:3718:53
Friday04/10/201906:3818:50
Saturday05/10/201906:4018:48
Sunday06/10/201906:4218:46
Monday07/10/201906:4318:43
Tuesday08/10/201906:4518:41
Wednesday09/10/201906:4718:39
Thursday10/10/201906:4918:37
Friday11/10/201906:5018:35
Saturday12/10/201906:5218:32
Sunday13/10/201906:5418:30
Monday14/10/201906:5518:28
Tuesday15/10/201906:5718:26
Wednesday16/10/201906:5918:24
Thursday17/10/201907:0018:22
Friday18/10/201907:0218:20
Saturday19/10/201907:0418:17
Sunday20/10/201907:0618:15
Monday21/10/201907:0718:13
Tuesday22/10/201907:0918:11
Wednesday23/10/201907:1118:09
Thursday24/10/201907:1218:07
Friday25/10/201907:1418:05
Saturday26/10/201907:1618:03
Sunday27/10/201906:1817:02
Monday28/10/201906:1917:00
Tuesday29/10/201906:2116:58
Wednesday30/10/201906:2316:56
Thursday31/10/201906:2416:54
Friday01/11/201906:2616:52
Saturday02/11/201906:2816:51
Sunday03/11/201906:3016:49
Monday04/11/201906:3116:47
Tuesday05/11/201906:3316:45
Wednesday06/11/201906:3516:44
Thursday07/11/201906:3616:42
Friday08/11/201906:3816:41
Saturday09/11/201906:4016:39
Sunday10/11/201906:4116:38
Monday11/11/201906:4316:36
Tuesday12/11/201906:4516:35
Wednesday13/11/201906:4616:33
Thursday14/11/201906:4816:32
Friday15/11/201906:5016:31
Saturday16/11/201906:5116:29
Sunday17/11/201906:5316:28
Monday18/11/201906:5516:27
Tuesday19/11/201906:5616:26
Wednesday20/11/201906:5816:25
Thursday21/11/201906:5916:24
Friday22/11/201907:0116:23
Saturday23/11/201907:0216:22
Sunday24/11/201907:0416:21
Monday25/11/201907:0516:20
Tuesday26/11/201907:0716:19
Wednesday27/11/201907:0816:18
Thursday28/11/201907:1016:17
Friday29/11/201907:1116:17
Saturday30/11/201907:1216:16
Sunday01/12/201907:1416:15
Monday02/12/201907:1516:15
Tuesday03/12/201907:1616:14
Wednesday04/12/201907:1816:14
Thursday05/12/201907:1916:14
Friday06/12/201907:2016:13
Saturday07/12/201907:2116:13
Sunday08/12/201907:2216:13
Monday09/12/201907:2316:12
Tuesday10/12/201907:2416:12
Wednesday11/12/201907:2516:12
Thursday12/12/201907:2616:12
Friday13/12/201907:2716:12
Saturday14/12/201907:2816:12
Sunday15/12/201907:2916:13
Monday16/12/201907:3016:13
Tuesday17/12/201907:3016:13
Wednesday18/12/201907:3116:13
Thursday19/12/201907:3216:14
Friday20/12/201907:3216:14
Saturday21/12/201907:3316:15
Sunday22/12/201907:3316:15
Monday23/12/201907:3416:16
Tuesday24/12/201907:3416:16
Wednesday25/12/201907:3516:17
Thursday26/12/201907:3516:18
Friday27/12/201907:3516:18
Saturday28/12/201907:3516:19
Sunday29/12/201907:3516:20
Monday30/12/201907:3516:21
Tuesday31/12/201907:3516:22

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 2019
» CSV Data for 2019

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