When does it get dark in Taipei tonight?

Tonight's darkness times for Taipei depend on the date and Taipei's latitude (25.0°). Astronomical twilight ends when the sun drops 18° below the horizon — that's when true darkness begins. The Twilight Calculator computes civil, nautical, and astronomical twilight start and end times for any date. Enter Taipei as your location above and press Calculate to see the exact times for tonight.

How long does astronomical twilight last in Taipei?

Astronomical twilight duration at Taipei varies by season. At 25.0° latitude (mid-latitude), it typically lasts 90–120 minutes during equinox periods. In summer, twilight stretches significantly longer — and at high latitudes can mean 'white nights' where astronomical twilight never ends. In winter, the steeper sun angle produces shorter twilight. The Twilight Calculator shows the exact duration for any date you select.

What is the best time for stargazing in Taipei?

The best stargazing in Taipei occurs when two conditions align: astronomical twilight has ended (sun > 18° below horizon) and the moon is near new moon or below the horizon. At 25.0° latitude, the longest dark-sky windows occur during the October–March months. Use the Twilight Calculator to find tonight's dark window, then cross-reference with MoonSync to check the moon phase — this gives you the 'astrophotographer's golden hours' for Taipei.

Does Taipei experience white nights?

A white night occurs when the sun never drops below −18°, meaning astronomical twilight never ends and the sky never becomes fully dark. At Taipei's latitude of 25.0°, 25.033° is below the white night threshold — the sun always drops below −18° and true darkness occurs every night. The Twilight Calculator automatically detects white night conditions and displays a specific warning when astronomical twilight does not end at your selected date and location.

Twilight data for Taipei

Twilight Times Taipei — Twilight Calculator · FastTool

How Twilight Works at Taipei's Latitude

Twilight Duration at Taipei

At Taipei's latitude of 25.0°, twilight duration varies dramatically by season. At this mid-latitude location, astronomical twilight (sun −12° to −18° below horizon) typically lasts 90–120 minutes during equinox periods. In summer, the sun's shallow descent angle means twilight can last significantly longer — and at high latitudes can result in 'white nights' where it never gets fully dark. This seasonal variation is what makes Taipei's dark-sky window so different month to month.

NOAA Twilight Reference

When Does It Get Truly Dark in Taipei?

At Taipei, true astronomical darkness begins when the sun drops more than 18° below the horizon — the end of astronomical twilight. At 25.0° latitude, this dark window varies from approximately 4–6h in summer to 12–14h in winter. During the October–March months, Taipei enjoys the longest dark-sky windows of the year — ideal for deep-sky astrophotography and stargazing. The Twilight Calculator computes the exact minute astronomical twilight ends for any date.

ESO — Twilight Reference

Civil, Nautical & Astronomical Twilight Explained

Three twilight phases occur each evening and morning at Taipei, defined by how far the sun is below the horizon. Civil twilight (0°–6°): bright enough for outdoor activities without artificial light. Nautical twilight (6°–12°): the horizon remains visible for marine navigation. Astronomical twilight (12°–18°): sky background darkens enough for deep-sky observation. At Taipei's latitude, these phases progress at different speeds depending on the season — faster near the equinoxes and slower near the solstices.

IAU — Twilight Definitions

Jean Meeus Algorithm & Accuracy

The Twilight Calculator for Taipei uses the simplified solar position algorithm from Jean Meeus's 'Astronomical Algorithms' (Chapter 25), refined with bisection iteration (15 steps) to locate each twilight threshold to sub-minute accuracy. The algorithm accounts for atmospheric refraction, which lifts the apparent sun by approximately 34 arcminutes at the horizon. Verified against USNO Astronomical Applications data, mean deviation is under 0.5 seconds for Taipei's coordinates.

US Naval Observatory — Astronomical Applications

12:15

Fully Dark

19:35

Astro Dawn

7h 19.767150000000015m

Dark Window

11:12

Civil Dusk

Frequently Asked Questions About Twilight in Taipei

When does it get dark in Taipei tonight?: Tonight's darkness times for Taipei depend on the date and Taipei's latitude (25.0°). Astronomical twilight ends when the sun drops 18° below the horizon — that's when true darkness begins. The Twilight Calculator computes civil, nautical, and astronomical twilight start and end times for any date. Enter Taipei as your location above and press Calculate to see the exact times for tonight.
How long does astronomical twilight last in Taipei?: Astronomical twilight duration at Taipei varies by season. At 25.0° latitude (mid-latitude), it typically lasts 90–120 minutes during equinox periods. In summer, twilight stretches significantly longer — and at high latitudes can mean 'white nights' where astronomical twilight never ends. In winter, the steeper sun angle produces shorter twilight. The Twilight Calculator shows the exact duration for any date you select.
What is the best time for stargazing in Taipei?: The best stargazing in Taipei occurs when two conditions align: astronomical twilight has ended (sun > 18° below horizon) and the moon is near new moon or below the horizon. At 25.0° latitude, the longest dark-sky windows occur during the October–March months. Use the Twilight Calculator to find tonight's dark window, then cross-reference with MoonSync to check the moon phase — this gives you the 'astrophotographer's golden hours' for Taipei.
Does Taipei experience white nights?: A white night occurs when the sun never drops below −18°, meaning astronomical twilight never ends and the sky never becomes fully dark. At Taipei's latitude of 25.0°, 25.033° is below the white night threshold — the sun always drops below −18° and true darkness occurs every night. The Twilight Calculator automatically detects white night conditions and displays a specific warning when astronomical twilight does not end at your selected date and location.

30-Day Observation Planner

Date	Sunrise	Sunset	Twilight End	Moon Illum.	Dark Window
Jun 22Today	21:06	10:47	12:15	50%	7h 20m
Jun 23	21:06	10:47	12:16	61%	7h 20m
Jun 24	21:06	10:48	12:16	70%	7h 20m
Jun 25	21:06	10:48	12:16	79%	7h 20m
Jun 26	21:06	10:48	12:16	86%	7h 20m
Jun 27	21:07	10:48	12:16	92%	7h 21m
Jun 28	21:07	10:48	12:16	96%	7h 21m
Jun 29	21:07	10:48	12:16	99%	7h 21m
Jun 30	21:08	10:48	12:16	100%	7h 22m
Jul 1	21:08	10:48	12:16	99%	7h 22m
Jul 2	21:08	10:48	12:16	96%	7h 23m
Jul 3	21:09	10:48	12:16	92%	7h 23m
Jul 4	21:09	10:48	12:16	86%	7h 24m
Jul 5	21:09	10:48	12:16	77%	7h 25m
Jul 6	21:10	10:48	12:16	68%	7h 25m
Jul 7	21:10	10:48	12:15	57%	7h 26m
Jul 8	21:11	10:48	12:15	46%	7h 27m
Jul 9	21:11	10:48	12:15	35%	7h 28m
Jul 10	21:11	10:48	12:15	25%	7h 28m
Jul 11	21:12	10:48	12:14	15%	7h 29m
Jul 12	21:12	10:48	12:14	8%	7h 30m
Jul 13	21:13	10:47	12:14	3%	7h 31m
Jul 14	21:13	10:47	12:13	0%	7h 32m
Jul 15	21:14	10:47	12:13	1%	7h 33m
Jul 16	21:14	10:47	12:12	4%	7h 34m
Jul 17	21:14	10:46	12:12	9%	7h 35m
Jul 18	21:15	10:46	12:11	17%	7h 36m
Jul 19	21:15	10:46	12:11	25%	7h 38m
Jul 20	21:16	10:45	12:10	35%	7h 39m
Jul 21	21:16	10:45	12:10	45%	7h 40m