Dämmerungszeiten Taipeh — Twilight Calculator · FastTool

Twilight Duration at Taipeh

At Taipeh'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 Taipeh's dark-sky window so different month to month.

Taipei liegt nahe des Wendekreises des Krebses auf 25°N — dem Breitengrad, an dem die Sonne zur Juni-Sonnenwende genau 90° Höhe erreicht und zur Mittagszeit keinen Schatten wirft. Das Nationalmuseum für Naturwissenschaften der Stadt betreibt ein spezielles Sonnenobservatorium, das den Zenitdurchgang der Sonne verfolgt, und das Wendekreis-Wahrzeichen in Chiayi zieht jedes Jahr im Juni Tausende Besucher an, um das 'No-Shadow-Day'-Phänomen zu beobachten.

When Does It Get Truly Dark in Taipeh?

At Taipeh, 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, Taipeh 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.

Taipei auf 25°N erlebt einen relativ bescheidenen saisonalen Tageslichtunterschied von 3,5 Stunden zwischen Sommer und Winter — der geringste unter den ostasiatischen Hauptstädten. Diese Äquatornähe bedeutet, dass die Goldenen Stunden der Stadt das ganze Jahr über konstanter sind als in höheren Breiten, wobei die Sonne in steileren Winkeln auf- und untergeht und klare, dramatische Schatten in Taipeis enger Gassenkultur erzeugt.

Civil, Nautical & Astronomical Twilight Explained

Three twilight phases occur each evening and morning at Taipeh, 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 Taipeh's latitude, these phases progress at different speeds depending on the season — faster near the equinoxes and slower near the solstices.

Jean Meeus Algorithm & Accuracy

The Twilight Calculator for Taipeh 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 Taipeh's coordinates.