bild

Midwinter sun track. Composite time-lapse image of the sun from inside the Arctic Circle. The bright light trail above the horizon is obtained by continuous exposure of the photographic film. In extreme northern and southern latitudes the sun only rises a short distance above the horizon in winter, as seen. Other effects include perpetual night, day or twilight for many months of the year. Photographed in Finland. (KEYSTONE/SCIENCE PHOTO LIBRARY/PEKKA PARVIAINEN)