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 2024 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
Tuesday27/02/202406:2317:56
Wednesday28/02/202406:2017:58
Thursday29/02/202406:1818:00
Friday01/03/202406:1618:02
Saturday02/03/202406:1418:03
Sunday03/03/202406:1218:05
Monday04/03/202406:0918:07
Tuesday05/03/202406:0718:09
Wednesday06/03/202406:0518:10
Thursday07/03/202406:0318:12
Friday08/03/202406:0118:14
Saturday09/03/202405:5818:16
Sunday10/03/202405:5618:17
Monday11/03/202405:5418:19
Tuesday12/03/202405:5118:21
Wednesday13/03/202405:4918:23
Thursday14/03/202405:4718:25
Friday15/03/202405:4418:26
Saturday16/03/202405:4218:28
Sunday17/03/202405:4018:30
Monday18/03/202405:3718:32
Tuesday19/03/202405:3518:33
Wednesday20/03/202405:3318:35
Thursday21/03/202405:3018:37
Friday22/03/202405:2818:39
Saturday23/03/202405:2618:40
Sunday24/03/202405:2318:42
Monday25/03/202405:2118:44
Tuesday26/03/202405:1918:46
Wednesday27/03/202405:1618:47
Thursday28/03/202405:1418:49
Friday29/03/202405:1118:51
Saturday30/03/202405:0918:53
Sunday31/03/202406:0719:54
Monday01/04/202406:0419:56
Tuesday02/04/202406:0219:58
Wednesday03/04/202406:0020:00
Thursday04/04/202405:5720:02
Friday05/04/202405:5520:03
Saturday06/04/202405:5220:05
Sunday07/04/202405:5020:07
Monday08/04/202405:4820:09
Tuesday09/04/202405:4520:11
Wednesday10/04/202405:4320:12
Thursday11/04/202405:4120:14
Friday12/04/202405:3820:16
Saturday13/04/202405:3620:18
Sunday14/04/202405:3420:20
Monday15/04/202405:3120:21
Tuesday16/04/202405:2920:23
Wednesday17/04/202405:2720:25
Thursday18/04/202405:2420:27
Friday19/04/202405:2220:29
Saturday20/04/202405:2020:30
Sunday21/04/202405:1820:32
Monday22/04/202405:1520:34
Tuesday23/04/202405:1320:36
Wednesday24/04/202405:1120:38
Thursday25/04/202405:0920:40
Friday26/04/202405:0720:41
Saturday27/04/202405:0420:43
Sunday28/04/202405:0220:45
Monday29/04/202405:0020:47
Tuesday30/04/202404:5820:49
Wednesday01/05/202404:5620:50
Thursday02/05/202404:5420:52
Friday03/05/202404:5220:54
Saturday04/05/202404:5020:56
Sunday05/05/202404:4820:58
Monday06/05/202404:4620:59
Tuesday07/05/202404:4421:01
Wednesday08/05/202404:4221:03
Thursday09/05/202404:4021:05
Friday10/05/202404:3821:07
Saturday11/05/202404:3621:08
Sunday12/05/202404:3521:10
Monday13/05/202404:3321:12
Tuesday14/05/202404:3121:13
Wednesday15/05/202404:2921:15
Thursday16/05/202404:2821:17
Friday17/05/202404:2621:18
Saturday18/05/202404:2421:20
Sunday19/05/202404:2321:22
Monday20/05/202404:2121:23
Tuesday21/05/202404:2021:25
Wednesday22/05/202404:1821:26
Thursday23/05/202404:1721:28
Friday24/05/202404:1621:29
Saturday25/05/202404:1421:31
Sunday26/05/202404:1321:32
Monday27/05/202404:1221:34
Tuesday28/05/202404:1121:35
Wednesday29/05/202404:0921:36
Thursday30/05/202404:0821:38
Friday31/05/202404:0721:39
Saturday01/06/202404:0621:40
Sunday02/06/202404:0521:41
Monday03/06/202404:0421:42
Tuesday04/06/202404:0421:43
Wednesday05/06/202404:0321:44
Thursday06/06/202404:0221:45
Friday07/06/202404:0221:46
Saturday08/06/202404:0121:47
Sunday09/06/202404:0121:48
Monday10/06/202404:0021:49
Tuesday11/06/202404:0021:50
Wednesday12/06/202403:5921:50
Thursday13/06/202403:5921:51
Friday14/06/202403:5921:52
Saturday15/06/202403:5921:52
Sunday16/06/202403:5921:53
Monday17/06/202403:5921:53
Tuesday18/06/202403:5921:53
Wednesday19/06/202403:5921:54
Thursday20/06/202403:5921:54
Friday21/06/202403:5921:54
Saturday22/06/202403:5921:54
Sunday23/06/202404:0021:54
Monday24/06/202404:0021:54
Tuesday25/06/202404:0121:54
Wednesday26/06/202404:0121:54
Thursday27/06/202404:0221:54
Friday28/06/202404:0221:53
Saturday29/06/202404:0321:53
Sunday30/06/202404:0421:53
Monday01/07/202404:0521:52
Tuesday02/07/202404:0621:52
Wednesday03/07/202404:0721:51
Thursday04/07/202404:0821:50
Friday05/07/202404:0921:50
Saturday06/07/202404:1021:49
Sunday07/07/202404:1121:48
Monday08/07/202404:1221:47
Tuesday09/07/202404:1321:46
Wednesday10/07/202404:1421:45
Thursday11/07/202404:1621:44
Friday12/07/202404:1721:43
Saturday13/07/202404:1821:42
Sunday14/07/202404:2021:41
Monday15/07/202404:2121:40
Tuesday16/07/202404:2321:39
Wednesday17/07/202404:2421:37
Thursday18/07/202404:2621:36
Friday19/07/202404:2721:35
Saturday20/07/202404:2921:33
Sunday21/07/202404:3021:32
Monday22/07/202404:3221:30
Tuesday23/07/202404:3321:29
Wednesday24/07/202404:3521:27
Thursday25/07/202404:3721:26
Friday26/07/202404:3821:24
Saturday27/07/202404:4021:22
Sunday28/07/202404:4221:21
Monday29/07/202404:4421:19
Tuesday30/07/202404:4521:17
Wednesday31/07/202404:4721:15
Thursday01/08/202404:4921:13
Friday02/08/202404:5121:11
Saturday03/08/202404:5221:10
Sunday04/08/202404:5421:08
Monday05/08/202404:5621:06
Tuesday06/08/202404:5821:04
Wednesday07/08/202404:5921:02
Thursday08/08/202405:0121:00
Friday09/08/202405:0320:58
Saturday10/08/202405:0520:56
Sunday11/08/202405:0720:54
Monday12/08/202405:0820:51
Tuesday13/08/202405:1020:49
Wednesday14/08/202405:1220:47
Thursday15/08/202405:1420:45
Friday16/08/202405:1620:43
Saturday17/08/202405:1720:41
Sunday18/08/202405:1920:38
Monday19/08/202405:2120:36
Tuesday20/08/202405:2320:34
Wednesday21/08/202405:2520:32
Thursday22/08/202405:2620:29
Friday23/08/202405:2820:27
Saturday24/08/202405:3020:25
Sunday25/08/202405:3220:23
Monday26/08/202405:3320:20
Tuesday27/08/202405:3520:18
Wednesday28/08/202405:3720:16
Thursday29/08/202405:3920:13
Friday30/08/202405:4020:11
Saturday31/08/202405:4220:09
Sunday01/09/202405:4420:06
Monday02/09/202405:4620:04
Tuesday03/09/202405:4720:02
Wednesday04/09/202405:4919:59
Thursday05/09/202405:5119:57
Friday06/09/202405:5219:54
Saturday07/09/202405:5419:52
Sunday08/09/202405:5619:50
Monday09/09/202405:5819:47
Tuesday10/09/202405:5919:45
Wednesday11/09/202406:0119:43
Thursday12/09/202406:0319:40
Friday13/09/202406:0419:38
Saturday14/09/202406:0619:35
Sunday15/09/202406:0819:33
Monday16/09/202406:1019:31
Tuesday17/09/202406:1119:28
Wednesday18/09/202406:1319:26
Thursday19/09/202406:1519:24
Friday20/09/202406:1619:21
Saturday21/09/202406:1819:19
Sunday22/09/202406:2019:16
Monday23/09/202406:2119:14
Tuesday24/09/202406:2319:12
Wednesday25/09/202406:2519:09
Thursday26/09/202406:2619:07
Friday27/09/202406:2819:05
Saturday28/09/202406:3019:02
Sunday29/09/202406:3119:00
Monday30/09/202406:3318:58
Tuesday01/10/202406:3518:55
Wednesday02/10/202406:3618:53
Thursday03/10/202406:3818:51
Friday04/10/202406:4018:48
Saturday05/10/202406:4118:46
Sunday06/10/202406:4318:44
Monday07/10/202406:4518:42
Tuesday08/10/202406:4618:39
Wednesday09/10/202406:4818:37
Thursday10/10/202406:5018:35
Friday11/10/202406:5218:33
Saturday12/10/202406:5318:31
Sunday13/10/202406:5518:28
Monday14/10/202406:5718:26
Tuesday15/10/202406:5818:24
Wednesday16/10/202407:0018:22
Thursday17/10/202407:0218:20
Friday18/10/202407:0318:18
Saturday19/10/202407:0518:16
Sunday20/10/202407:0718:14
Monday21/10/202407:0918:12
Tuesday22/10/202407:1018:10
Wednesday23/10/202407:1218:08
Thursday24/10/202407:1418:06
Friday25/10/202407:1518:04
Saturday26/10/202407:1718:02
Sunday27/10/202406:1917:00
Monday28/10/202406:2116:58
Tuesday29/10/202406:2216:56
Wednesday30/10/202406:2416:55
Thursday31/10/202406:2616:53
Friday01/11/202406:2716:51
Saturday02/11/202406:2916:49
Sunday03/11/202406:3116:48
Monday04/11/202406:3316:46
Tuesday05/11/202406:3416:44
Wednesday06/11/202406:3616:43
Thursday07/11/202406:3816:41
Friday08/11/202406:3916:39
Saturday09/11/202406:4116:38
Sunday10/11/202406:4316:36
Monday11/11/202406:4416:35
Tuesday12/11/202406:4616:34
Wednesday13/11/202406:4816:32
Thursday14/11/202406:4916:31
Friday15/11/202406:5116:30
Saturday16/11/202406:5316:28
Sunday17/11/202406:5416:27
Monday18/11/202406:5616:26
Tuesday19/11/202406:5716:25
Wednesday20/11/202406:5916:24
Thursday21/11/202407:0116:23
Friday22/11/202407:0216:22
Saturday23/11/202407:0416:21
Sunday24/11/202407:0516:20
Monday25/11/202407:0716:19
Tuesday26/11/202407:0816:18
Wednesday27/11/202407:0916:17
Thursday28/11/202407:1116:17
Friday29/11/202407:1216:16
Saturday30/11/202407:1416:16
Sunday01/12/202407:1516:15
Monday02/12/202407:1616:14
Tuesday03/12/202407:1716:14
Wednesday04/12/202407:1916:14
Thursday05/12/202407:2016:13
Friday06/12/202407:2116:13
Saturday07/12/202407:2216:13
Sunday08/12/202407:2316:13
Monday09/12/202407:2416:12
Tuesday10/12/202407:2516:12
Wednesday11/12/202407:2616:12
Thursday12/12/202407:2716:12
Friday13/12/202407:2816:12
Saturday14/12/202407:2916:13
Sunday15/12/202407:3016:13
Monday16/12/202407:3016:13
Tuesday17/12/202407:3116:13
Wednesday18/12/202407:3216:14
Thursday19/12/202407:3216:14
Friday20/12/202407:3316:14
Saturday21/12/202407:3316:15
Sunday22/12/202407:3416:16
Monday23/12/202407:3416:16
Tuesday24/12/202407:3416:17
Wednesday25/12/202407:3516:18
Thursday26/12/202407:3516:18
Friday27/12/202407:3516:19
Saturday28/12/202407:3516:20
Sunday29/12/202407:3516:21
Monday30/12/202407:3516:22
Tuesday31/12/202407:3516:23

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 2024
» CSV Data for 2024

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