Dämmerungszeiten A Coruña — Twilight Calculator · FastTool

Twilight Duration at A Coruña

At A Coruña's latitude of 43.4°, 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 A Coruña's dark-sky window so different month to month.

A Coruña liegt direkt auf der Zentrallinie der totalen Sonnenfinsternis vom 12. August 2026 — mit 1 Minute 58 Sekunden die längste Totalität aller größeren Städte im Pfad. Der Herkulesturm der Stadt, ein römischer Leuchtturm aus dem 1. Jahrhundert und UNESCO-Weltkulturerbe, wacht seit fast 2.000 Jahren über diese Atlantikküste und wird Zeuge, wie der Mondschatten über die Biskaya zieht.

When Does It Get Truly Dark in A Coruña?

At A Coruña, true astronomical darkness begins when the sun drops more than 18° below the horizon — the end of astronomical twilight. At 43.4° latitude, this dark window varies from approximately 4–6h in summer to 12–14h in winter. During the October–March months, A Coruña 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.

Auf 43,4°N an Spaniens nordwestlicher Atlantikküste wird A Coruñas Sonnenbahn von der Kantabrischen See geprägt: Die Sommer-Sonnenuntergänge verweilen bis nach 22 Uhr über dem Wasser und erzeugen ausgedehnte Goldene Stunden, die Fotografen an die gläserne Paseo Marítimo locken — mit über 13 km die längste Uferpromenade Europas.

Civil, Nautical & Astronomical Twilight Explained

Three twilight phases occur each evening and morning at A Coruña, 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 A Coruña'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 A Coruña 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 A Coruña's coordinates.