Продолжительность сумерек в Берлин
На широте Берлин 52.5° продолжительность сумерек dramatically varies by season. At this high-latitude location, astronomical twilight (sun −12° to −18° below horizon) typically lasts 2–4 hours 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 Берлин's dark-sky window so different month to month.
The Berlin Observatory, founded in 1700 by Gottfried Leibniz, made history when Johann Gottfried Galle first observed Neptune through its telescope on September 23, 1846 — exactly where Urbain Le Verrier's mathematical calculations predicted. The observatory's Einstein Tower in Potsdam, a striking expressionist building, continues studying solar magnetic fields today.
Справочник сумерек NOAA