Winter light in Iceland is not a long sunset; it is daylight forced to skim the rim of the sky. The Sun barely climbs. Because Earth's axial tilt leaves the Northern Hemisphere inclined away from it during winter, solar declination is low, and the daily solar arc meets the horizon at a shallow angle rather than dropping steeply.
That shallow arc is the whole trick. It looks stalled. At high latitude, the Sun travels sideways across an observer's sky, so it can linger near the horizon for hours even while its actual rise and set remain ordinary astronomical events. Civil twilight stretches the effect, since the Sun sits just below the horizon while scattered light still reaches the ground. A low solar elevation also makes shadows lengthy and colors conspicuous, turning noon into something closer to late afternoon.
The romance is real, but physics still wins. Atmospheric refraction bends incoming sunlight slightly, allowing the Sun to be seen when geometry alone would place it below the horizon; clouds can prolong the warm display or erase it outright. The effect depends on weather too. Near the shortest days, usable light may outlast direct sunshine by a wide margin, because dawn and dusk overlap in a long band of twilight. Iceland's latitude makes this slow-motion passage common in winter, especially away from the brief middle of the day. Thus the eye receives a drawn-out fade, not a sunset that forgot to end.