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 2020 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
Sunday26/01/202007:1916:59
Monday27/01/202007:1717:01
Tuesday28/01/202007:1617:02
Wednesday29/01/202007:1517:04
Thursday30/01/202007:1317:06
Friday31/01/202007:1217:08
Saturday01/02/202007:1017:09
Sunday02/02/202007:0917:11
Monday03/02/202007:0717:13
Tuesday04/02/202007:0617:15
Wednesday05/02/202007:0417:16
Thursday06/02/202007:0317:18
Friday07/02/202007:0117:20
Saturday08/02/202006:5917:22
Sunday09/02/202006:5817:24
Monday10/02/202006:5617:25
Tuesday11/02/202006:5417:27
Wednesday12/02/202006:5217:29
Thursday13/02/202006:5017:31
Friday14/02/202006:4917:33
Saturday15/02/202006:4717:35
Sunday16/02/202006:4517:36
Monday17/02/202006:4317:38
Tuesday18/02/202006:4117:40
Wednesday19/02/202006:3917:42
Thursday20/02/202006:3717:44
Friday21/02/202006:3517:45
Saturday22/02/202006:3317:47
Sunday23/02/202006:3117:49
Monday24/02/202006:2917:51
Tuesday25/02/202006:2717:53
Wednesday26/02/202006:2517:54
Thursday27/02/202006:2317:56
Friday28/02/202006:2017:58
Saturday29/02/202006:1818:00
Sunday01/03/202006:1618:01
Monday02/03/202006:1418:03
Tuesday03/03/202006:1218:05
Wednesday04/03/202006:1018:07
Thursday05/03/202006:0718:09
Friday06/03/202006:0518:10
Saturday07/03/202006:0318:12
Sunday08/03/202006:0118:14
Monday09/03/202005:5818:16
Tuesday10/03/202005:5618:17
Wednesday11/03/202005:5418:19
Thursday12/03/202005:5118:21
Friday13/03/202005:4918:23
Saturday14/03/202005:4718:24
Sunday15/03/202005:4518:26
Monday16/03/202005:4218:28
Tuesday17/03/202005:4018:30
Wednesday18/03/202005:3818:31
Thursday19/03/202005:3518:33
Friday20/03/202005:3318:35
Saturday21/03/202005:3018:37
Sunday22/03/202005:2818:39
Monday23/03/202005:2618:40
Tuesday24/03/202005:2318:42
Wednesday25/03/202005:2118:44
Thursday26/03/202005:1918:46
Friday27/03/202005:1618:47
Saturday28/03/202005:1418:49
Sunday29/03/202006:1219:51
Monday30/03/202006:0919:53
Tuesday31/03/202006:0719:54
Wednesday01/04/202006:0419:56
Thursday02/04/202006:0219:58
Friday03/04/202006:0020:00
Saturday04/04/202005:5720:02
Sunday05/04/202005:5520:03
Monday06/04/202005:5320:05
Tuesday07/04/202005:5020:07
Wednesday08/04/202005:4820:09
Thursday09/04/202005:4520:10
Friday10/04/202005:4320:12
Saturday11/04/202005:4120:14
Sunday12/04/202005:3820:16
Monday13/04/202005:3620:18
Tuesday14/04/202005:3420:19
Wednesday15/04/202005:3120:21
Thursday16/04/202005:2920:23
Friday17/04/202005:2720:25
Saturday18/04/202005:2520:27
Sunday19/04/202005:2220:29
Monday20/04/202005:2020:30
Tuesday21/04/202005:1820:32
Wednesday22/04/202005:1620:34
Thursday23/04/202005:1320:36
Friday24/04/202005:1120:38
Saturday25/04/202005:0920:39
Sunday26/04/202005:0720:41
Monday27/04/202005:0520:43
Tuesday28/04/202005:0220:45
Wednesday29/04/202005:0020:47
Thursday30/04/202004:5820:49
Friday01/05/202004:5620:50
Saturday02/05/202004:5420:52
Sunday03/05/202004:5220:54
Monday04/05/202004:5020:56
Tuesday05/05/202004:4820:58
Wednesday06/05/202004:4620:59
Thursday07/05/202004:4421:01
Friday08/05/202004:4221:03
Saturday09/05/202004:4021:05
Sunday10/05/202004:3821:06
Monday11/05/202004:3621:08
Tuesday12/05/202004:3521:10
Wednesday13/05/202004:3321:12
Thursday14/05/202004:3121:13
Friday15/05/202004:2921:15
Saturday16/05/202004:2821:17
Sunday17/05/202004:2621:18
Monday18/05/202004:2421:20
Tuesday19/05/202004:2321:22
Wednesday20/05/202004:2121:23
Thursday21/05/202004:2021:25
Friday22/05/202004:1821:26
Saturday23/05/202004:1721:28
Sunday24/05/202004:1621:29
Monday25/05/202004:1421:31
Tuesday26/05/202004:1321:32
Wednesday27/05/202004:1221:34
Thursday28/05/202004:1121:35
Friday29/05/202004:0921:36
Saturday30/05/202004:0821:38
Sunday31/05/202004:0721:39
Monday01/06/202004:0621:40
Tuesday02/06/202004:0521:41
Wednesday03/06/202004:0521:42
Thursday04/06/202004:0421:43
Friday05/06/202004:0321:44
Saturday06/06/202004:0221:45
Sunday07/06/202004:0221:46
Monday08/06/202004:0121:47
Tuesday09/06/202004:0121:48
Wednesday10/06/202004:0021:49
Thursday11/06/202004:0021:50
Friday12/06/202003:5921:50
Saturday13/06/202003:5921:51
Sunday14/06/202003:5921:52
Monday15/06/202003:5921:52
Tuesday16/06/202003:5921:52
Wednesday17/06/202003:5921:53
Thursday18/06/202003:5921:53
Friday19/06/202003:5921:54
Saturday20/06/202003:5921:54
Sunday21/06/202003:5921:54
Monday22/06/202003:5921:54
Tuesday23/06/202004:0021:54
Wednesday24/06/202004:0021:54
Thursday25/06/202004:0121:54
Friday26/06/202004:0121:54
Saturday27/06/202004:0221:54
Sunday28/06/202004:0221:53
Monday29/06/202004:0321:53
Tuesday30/06/202004:0421:53
Wednesday01/07/202004:0521:52
Thursday02/07/202004:0621:52
Friday03/07/202004:0721:51
Saturday04/07/202004:0821:50
Sunday05/07/202004:0921:50
Monday06/07/202004:1021:49
Tuesday07/07/202004:1121:48
Wednesday08/07/202004:1221:47
Thursday09/07/202004:1321:46
Friday10/07/202004:1421:46
Saturday11/07/202004:1621:45
Sunday12/07/202004:1721:43
Monday13/07/202004:1821:42
Tuesday14/07/202004:2021:41
Wednesday15/07/202004:2121:40
Thursday16/07/202004:2321:39
Friday17/07/202004:2421:37
Saturday18/07/202004:2621:36
Sunday19/07/202004:2721:35
Monday20/07/202004:2921:33
Tuesday21/07/202004:3021:32
Wednesday22/07/202004:3221:30
Thursday23/07/202004:3321:29
Friday24/07/202004:3521:27
Saturday25/07/202004:3721:26
Sunday26/07/202004:3821:24
Monday27/07/202004:4021:22
Tuesday28/07/202004:4221:21
Wednesday29/07/202004:4421:19
Thursday30/07/202004:4521:17
Friday31/07/202004:4721:15
Saturday01/08/202004:4921:13
Sunday02/08/202004:5021:12
Monday03/08/202004:5221:10
Tuesday04/08/202004:5421:08
Wednesday05/08/202004:5621:06
Thursday06/08/202004:5821:04
Friday07/08/202004:5921:02
Saturday08/08/202005:0121:00
Sunday09/08/202005:0320:58
Monday10/08/202005:0520:56
Tuesday11/08/202005:0720:54
Wednesday12/08/202005:0820:51
Thursday13/08/202005:1020:49
Friday14/08/202005:1220:47
Saturday15/08/202005:1420:45
Sunday16/08/202005:1620:43
Monday17/08/202005:1720:41
Tuesday18/08/202005:1920:38
Wednesday19/08/202005:2120:36
Thursday20/08/202005:2320:34
Friday21/08/202005:2420:32
Saturday22/08/202005:2620:30
Sunday23/08/202005:2820:27
Monday24/08/202005:3020:25
Tuesday25/08/202005:3220:23
Wednesday26/08/202005:3320:20
Thursday27/08/202005:3520:18
Friday28/08/202005:3720:16
Saturday29/08/202005:3920:13
Sunday30/08/202005:4020:11
Monday31/08/202005:4220:09
Tuesday01/09/202005:4420:06
Wednesday02/09/202005:4620:04
Thursday03/09/202005:4720:02
Friday04/09/202005:4919:59
Saturday05/09/202005:5119:57
Sunday06/09/202005:5219:55
Monday07/09/202005:5419:52
Tuesday08/09/202005:5619:50
Wednesday09/09/202005:5819:47
Thursday10/09/202005:5919:45
Friday11/09/202006:0119:43
Saturday12/09/202006:0319:40
Sunday13/09/202006:0419:38
Monday14/09/202006:0619:36
Tuesday15/09/202006:0819:33
Wednesday16/09/202006:0919:31
Thursday17/09/202006:1119:28
Friday18/09/202006:1319:26
Saturday19/09/202006:1519:24
Sunday20/09/202006:1619:21
Monday21/09/202006:1819:19
Tuesday22/09/202006:2019:16
Wednesday23/09/202006:2119:14
Thursday24/09/202006:2319:12
Friday25/09/202006:2519:09
Saturday26/09/202006:2619:07
Sunday27/09/202006:2819:05
Monday28/09/202006:3019:02
Tuesday29/09/202006:3119:00
Wednesday30/09/202006:3318:58
Thursday01/10/202006:3518:55
Friday02/10/202006:3618:53
Saturday03/10/202006:3818:51
Sunday04/10/202006:4018:49
Monday05/10/202006:4118:46
Tuesday06/10/202006:4318:44
Wednesday07/10/202006:4518:42
Thursday08/10/202006:4618:40
Friday09/10/202006:4818:37
Saturday10/10/202006:5018:35
Sunday11/10/202006:5218:33
Monday12/10/202006:5318:31
Tuesday13/10/202006:5518:29
Wednesday14/10/202006:5718:26
Thursday15/10/202006:5818:24
Friday16/10/202007:0018:22
Saturday17/10/202007:0218:20
Sunday18/10/202007:0318:18
Monday19/10/202007:0518:16
Tuesday20/10/202007:0718:14
Wednesday21/10/202007:0918:12
Thursday22/10/202007:1018:10
Friday23/10/202007:1218:08
Saturday24/10/202007:1418:06
Sunday25/10/202006:1517:04
Monday26/10/202006:1717:02
Tuesday27/10/202006:1917:00
Wednesday28/10/202006:2116:58
Thursday29/10/202006:2216:56
Friday30/10/202006:2416:55
Saturday31/10/202006:2616:53
Sunday01/11/202006:2716:51
Monday02/11/202006:2916:49
Tuesday03/11/202006:3116:48
Wednesday04/11/202006:3316:46
Thursday05/11/202006:3416:44
Friday06/11/202006:3616:43
Saturday07/11/202006:3816:41
Sunday08/11/202006:3916:39
Monday09/11/202006:4116:38
Tuesday10/11/202006:4316:37
Wednesday11/11/202006:4416:35
Thursday12/11/202006:4616:34
Friday13/11/202006:4816:32
Saturday14/11/202006:4916:31
Sunday15/11/202006:5116:30
Monday16/11/202006:5316:28
Tuesday17/11/202006:5416:27
Wednesday18/11/202006:5616:26
Thursday19/11/202006:5716:25
Friday20/11/202006:5916:24
Saturday21/11/202007:0116:23
Sunday22/11/202007:0216:22
Monday23/11/202007:0416:21
Tuesday24/11/202007:0516:20
Wednesday25/11/202007:0716:19
Thursday26/11/202007:0816:18
Friday27/11/202007:0916:18
Saturday28/11/202007:1116:17
Sunday29/11/202007:1216:16
Monday30/11/202007:1316:16
Tuesday01/12/202007:1516:15
Wednesday02/12/202007:1616:14
Thursday03/12/202007:1716:14
Friday04/12/202007:1916:14
Saturday05/12/202007:2016:13
Sunday06/12/202007:2116:13
Monday07/12/202007:2216:13
Tuesday08/12/202007:2316:13
Wednesday09/12/202007:2416:12
Thursday10/12/202007:2516:12
Friday11/12/202007:2616:12
Saturday12/12/202007:2716:12
Sunday13/12/202007:2816:12
Monday14/12/202007:2916:13
Tuesday15/12/202007:3016:13
Wednesday16/12/202007:3016:13
Thursday17/12/202007:3116:13
Friday18/12/202007:3216:14
Saturday19/12/202007:3216:14
Sunday20/12/202007:3316:14
Monday21/12/202007:3316:15
Tuesday22/12/202007:3416:16
Wednesday23/12/202007:3416:16
Thursday24/12/202007:3416:17
Friday25/12/202007:3516:18
Saturday26/12/202007:3516:18
Sunday27/12/202007:3516:19
Monday28/12/202007:3516:20
Tuesday29/12/202007:3516:21
Wednesday30/12/202007:3516:22
Thursday31/12/202007:3516:23

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 2020
» CSV Data for 2020

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