For how long does the twilight last?

Civil twilight is the time of day when the whole of the Sun is below the horizon, but the centre of the Sun is no more than 6° below the horizon
Nautical twilight is the time of day when the centre of the Sun is between 6° and 12° below the horizon
Astronomical twilight is the time of day when the centre of the Sun is between 12° and 18° below the horizon
These charts show the durations of twilights at various latitudes and times of the year

Civil twilight

Nautical twilight

Astronomical twilight

Entire twilight

Entire twilight (civil, nautical and astronomical)

Guidance to the tables

The tables show for how many minutes the civil twilight lasts. Civil twilight is the time when the entire Sun is below the horizon, but the centre of the Sun is less than 6° below the horizon.

Italicized numbers refer to polar night. At those times, there is no daytime between the two periods of twilight. As morning twilight ends, evening twilight begins. In these cases, the entire duration of the civil twilight is twice as much as the table shows.

Numbers in bold type mean that the twilight lasts all night. In these cases, the table shows the duration from sunset to solar midnight. The entire twilight, from sunset to sunrise, lasts twice as long as the table shows.

Northern hemisphere – duration of twilight in 2021

Date	0°	N 10°	N 20°	N 30°	N 35°	N 40°	N 45°	N 50°	N 52°	N 54°	N 56°	N 58°	N 60°	N 62°	N 64°	N 66°	N 68°	N 70°	N 72°
Jan. 1	22	23	24	26	28	30	34	38	41	43	47	51	57	64	75	94	167	135	82
11	22	23	24	26	28	30	33	37	40	42	45	49	54	60	69	83	110	160	122
21	22	22	23	26	27	29	32	36	38	41	43	47	51	56	63	72	87	116	166
31	22	22	23	25	27	29	31	35	37	39	41	44	48	52	57	64	73	87	112
Feb. 10	21	22	23	25	26	28	31	34	35	37	40	42	45	48	53	58	64	73	86
20	21	21	22	24	26	28	30	33	34	36	38	40	43	46	50	54	59	66	74
Mar. 2	21	21	22	24	25	27	29	32	34	35	37	39	42	45	48	52	56	62	69
12	21	21	22	24	25	27	29	32	34	35	37	39	41	44	47	51	55	61	67
22	21	21	22	24	25	27	29	32	34	35	37	39	42	45	48	52	56	62	69
Apr. 1	21	21	22	24	25	27	30	33	34	36	38	40	43	46	50	54	60	66	76
11	21	21	22	24	26	28	30	34	35	37	40	42	45	49	53	59	66	76	91
21	21	22	23	25	26	29	31	35	37	39	42	45	49	53	59	67	79	100	181
May 1	21	22	23	25	27	29	32	37	39	42	45	49	54	60	69	84	115	150	110
11	22	22	23	26	28	30	34	39	41	44	48	54	60	71	88	159	129	81	0
21	22	23	24	27	29	31	35	41	44	48	53	60	70	88	150	119	68	0	0
31	22	23	24	27	29	32	36	43	46	51	57	67	83	142	121	76	0	0	0
Jun. 10	22	23	24	27	30	33	37	44	48	54	61	73	98	134	99	24	0	0	0
20	23	23	25	27	30	33	37	45	49	55	63	76	107	128	89	0	0	0	0
30	22	23	25	27	30	33	37	44	48	54	61	74	99	133	97	12	0	0	0
Jul. 10	22	23	24	27	29	32	36	43	47	51	58	68	85	148	118	70	0	0	0
20	22	23	24	27	29	31	35	41	44	48	53	61	72	92	146	113	56	0	0
30	22	22	24	26	28	30	34	39	42	45	49	54	62	73	92	153	121	67	0
Aug. 9	21	22	23	25	27	30	33	37	39	42	45	49	54	61	71	88	132	141	96
19	21	22	23	25	27	29	31	35	37	40	42	45	49	54	61	69	83	108	170
29	21	21	22	24	26	28	31	34	36	38	40	43	46	50	54	60	68	79	96
Sep. 8	21	21	22	24	26	27	30	33	35	36	38	41	43	46	50	55	61	68	78
18	21	21	22	24	25	27	29	32	34	35	37	39	42	45	48	52	57	63	70
28	21	21	22	24	25	27	29	32	34	35	37	39	41	44	47	51	55	61	67
Oct. 8	21	21	22	24	25	27	29	32	34	35	37	39	42	44	48	51	56	61	68
18	21	21	22	24	26	27	30	33	34	36	38	40	43	46	49	53	58	64	72
28	21	22	23	25	26	28	30	34	35	37	39	42	44	48	52	57	63	71	82
Nov. 7	22	22	23	25	26	28	31	35	36	38	41	43	47	51	56	62	70	82	102
17	22	22	23	25	27	29	32	36	38	40	43	46	50	55	61	69	82	104	180
27	22	22	24	26	28	30	33	37	39	42	45	48	53	59	67	79	102	170	135
Dec. 7	22	23	24	26	28	30	33	38	40	43	46	51	56	63	74	91	142	141	93
17	23	23	24	26	28	31	34	38	41	44	47	52	58	66	78	100	160	125	64
27	23	23	24	26	28	31	34	38	41	44	47	52	57	65	77	99	161	127	67
37	22	23	24	26	28	30	33	38	40	43	46	50	55	62	73	89	131	145	100

Southern hemisphere – duration of twilight in 2021

Date	S 60°	S 58°	S 56°	S 54°	S 52°	S 50°	S 45°	S 40°	S 35°	S 30°	S 20°	S 10°	0°
Jan. 1	96	72	61	53	48	44	37	33	30	27	24	23	22
11	80	65	57	50	46	42	36	32	29	27	24	23	22
21	67	58	52	47	43	40	35	31	28	26	24	22	22
31	58	52	47	44	41	38	33	30	28	26	23	22	22
Feb. 10	52	47	44	41	38	36	32	29	27	25	23	22	21
20	47	44	41	38	36	35	31	28	26	25	23	21	21
Mar. 2	44	41	39	37	35	33	30	28	26	24	22	21	21
12	42	40	38	36	34	33	30	27	25	24	22	21	21
22	41	39	37	35	34	32	29	27	25	24	22	21	21
Apr. 1	41	39	37	35	34	32	29	27	25	24	22	21	21
11	42	40	38	36	34	33	30	27	25	24	22	21	21
21	44	41	39	37	35	33	30	28	26	24	22	21	21
May 1	46	43	40	38	36	34	31	28	26	25	23	22	21
11	48	45	42	39	37	35	32	29	27	25	23	22	22
21	51	47	44	41	39	36	32	29	27	26	23	22	22
31	54	50	46	42	40	37	33	30	28	26	24	23	22
Jun. 10	57	51	47	43	41	38	34	30	28	26	24	23	22
20	58	52	47	44	41	39	34	31	28	26	24	23	23
30	57	51	47	44	41	38	34	30	28	26	24	23	22
Jul. 10	55	50	46	43	40	38	33	30	28	26	24	23	22
20	52	48	44	41	39	37	33	30	27	26	24	22	22
30	49	45	42	40	37	35	32	29	27	25	23	22	22
Aug. 9	46	43	40	38	36	34	31	28	26	25	23	22	21
19	44	41	39	37	35	33	30	28	26	24	23	21	21
29	42	40	38	36	34	33	30	27	26	24	22	21	21
Sep. 8	42	39	37	35	34	32	29	27	25	24	22	21	21
18	41	39	37	35	34	32	29	27	25	24	22	21	21
28	42	40	37	36	34	32	29	27	25	24	22	21	21
Oct. 8	44	41	39	36	35	33	30	27	26	24	22	21	21
18	46	43	40	38	36	34	31	28	26	25	22	21	21
28	50	46	43	40	38	36	32	29	27	25	23	22	21
Nov. 7	56	50	46	43	40	37	33	30	27	26	23	22	22
17	64	56	50	46	42	40	34	31	28	26	24	22	22
27	76	63	55	49	45	42	36	32	29	27	24	23	22
Dec. 7	91	70	60	53	47	44	37	32	29	27	24	23	22
17	105	75	62	54	49	45	37	33	30	27	25	23	23
27	103	75	62	54	49	44	37	33	30	27	25	23	23
37	88	69	59	52	47	43	37	32	29	27	24	23	22

Sources

Jean Meeus: Astronomical Algorithms (1998), pages 101–104

In other languages

Hvor lenge varer tussmørket? (Norwegian)
Kor lenge varer tussmørkret? (New Norwegian)
Hvor længe varer tusmørket? (Danish)
Hur länge varar skymningen? (Swedish)