Boulder, CO: Sunrise, Sunset, Moonrise, Moonset, Twilight

Calculated for September 2023

Tabular summary: Time of Sunrise, sunset, moonrise, moonset, daylight hours, twilight for Boulder, CO - all times are local times no DST is calculated
	Sun				Moon		Twilight
Day	Rise	Set	Transit	Daylight	Rise	Set	Morning	Evening
Fri Sep 1	05:28	18:36	12:01	13:07 hrs.	19:45	07:17	04:27	19:35
Sat Sep 2	05:29	18:34	12:01	13:05 hrs.	20:10	08:33	04:28	19:34
Sun Sep 3	05:30	18:33	12:00	13:02 hrs.	20:37	09:47	04:29	19:32
Mon Sep 4	05:31	18:31	12:00	13:00 hrs.	21:07	11:00	04:31	19:30
Tue Sep 5	05:32	18:29	12:00	12:57 hrs.	21:41	12:11	04:32	19:28
Wed Sep 6	05:33	18:28	11:59	12:55 hrs.	22:21	13:19	04:33	19:27
Thu Sep 7	05:34	18:26	11:59	12:52 hrs.	23:09	14:22	04:34	19:25
Fri Sep 8	05:35	18:25	11:59	12:50 hrs.	--	15:17	04:35	19:23
Sat Sep 9	05:36	18:23	11:58	12:47 hrs.	00:03	16:03	04:36	19:21
Sun Sep 10	05:37	18:21	11:58	12:44 hrs.	01:02	16:41	04:37	19:20
Mon Sep 11	05:38	18:20	11:57	12:42 hrs.	02:04	17:12	04:38	19:18
Tue Sep 12	05:39	18:18	11:57	12:39 hrs.	03:06	17:38	04:39	19:16
Wed Sep 13	05:40	18:16	11:57	12:37 hrs.	04:08	17:59	04:40	19:14
Thu Sep 14	05:41	18:15	11:56	12:34 hrs.	05:09	18:20	04:41	19:13
Fri Sep 15	05:42	18:13	11:56	12:31 hrs.	06:09	18:40	04:42	19:11
Sat Sep 16	05:43	18:11	11:56	12:29 hrs.	07:10	19:00	04:43	19:09
Sun Sep 17	05:44	18:10	11:55	12:26 hrs.	08:11	19:21	04:44	19:07
Mon Sep 18	05:45	18:08	11:55	12:24 hrs.	09:15	19:46	04:45	19:06
Tue Sep 19	05:46	18:07	11:55	12:21 hrs.	10:21	20:14	04:46	19:04
Wed Sep 20	05:46	18:05	11:54	12:18 hrs.	11:29	20:50	04:47	19:02
Thu Sep 21	05:47	18:03	11:54	12:16 hrs.	12:39	--	04:49	19:00
Fri Sep 22	05:48	17:58	11:54	12:10 hrs.	13:45	22:25	04:50	18:57
Sat Sep 23	05:49	17:57	11:53	12:07 hrs.	14:44	23:32	04:51	18:55
Sun Sep 24	05:50	17:55	11:53	12:05 hrs.	15:35	00:48	04:52	18:54
Mon Sep 25	05:51	17:53	11:53	12:02 hrs.	16:15	00:52	04:53	18:52
Tue Sep 26	05:52	17:52	11:52	11:59 hrs.	16:49	02:11	04:54	18:50
Wed Sep 27	05:53	17:50	11:52	11:57 hrs.	17:17	03:30	04:55	18:48
Thu Sep 28	05:54	17:48	11:52	11:54 hrs.	17:43	04:48	04:56	18:47
Fri Sep 29	05:55	17:47	11:51	11:51 hrs.	18:08	06:05	04:57	18:45
Sat Sep 30	05:56	17:45	11:51	11:49 hrs.	18:34	07:21	04:58	18:43
Sun Oct 1	05:57	17:43	11:51	11:46 hrs.	19:02	08:37	04:59	18:42

Annotation:

The calculated time for sunrise, sunset, moonrise, is accurate to + - 1 minute. The actual times depend on unpredictable atmospheric conditions that affect the amount of refraction at the horizon. Local topography (e.g., mountains on the horizon) and the height of the observer can affect the times of rise or set even more.

The times of dawn and dusk relate to the beginning of the so-called "nautical twilight" (ie when the sun is 12 degrees below the horizon). All calculations are for sea level.

Calculation of sunset and sunrise times for cities apart of the list of predefined cities are dependent on the exact latitude and longitude coordinates and the time zone you entered.

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