CUCBC

Cambridge University Combined Boat Clubs

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 2023 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.

Day	Date	Lighting Down	Lighting Up
Thursday	07/12/2023	07:21	16:13
Friday	08/12/2023	07:22	16:13
Saturday	09/12/2023	07:23	16:12
Sunday	10/12/2023	07:24	16:12
Monday	11/12/2023	07:25	16:12
Tuesday	12/12/2023	07:26	16:12
Wednesday	13/12/2023	07:27	16:12
Thursday	14/12/2023	07:28	16:12
Friday	15/12/2023	07:29	16:13
Saturday	16/12/2023	07:30	16:13
Sunday	17/12/2023	07:30	16:13
Monday	18/12/2023	07:31	16:13
Tuesday	19/12/2023	07:32	16:14
Wednesday	20/12/2023	07:32	16:14
Thursday	21/12/2023	07:33	16:15
Friday	22/12/2023	07:33	16:15
Saturday	23/12/2023	07:34	16:16
Sunday	24/12/2023	07:34	16:16
Monday	25/12/2023	07:35	16:17
Tuesday	26/12/2023	07:35	16:18
Wednesday	27/12/2023	07:35	16:19
Thursday	28/12/2023	07:35	16:19
Friday	29/12/2023	07:35	16:20
Saturday	30/12/2023	07:35	16:21
Sunday	31/12/2023	07:35	16:22

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 2023
» CSV Data for 2023