Продолжительность сумерек в Мадрид
На широте Мадрид 40.4° продолжительность сумерек dramatically varies 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 Мадрид's dark-sky window so different month to month.
Perched at 667 meters above sea level on Europe's highest capital plateau, Madrid's altitude gives its amateur astronomers a distinct advantage: thinner air means less atmospheric turbulence and sharper planetary views through modest telescopes. Madrid's status as a UNWTO hub has also made it a gathering point for international astrotourism conferences.
Справочник сумерек NOAA