Longyearbyen, originally a coal mining town named for the American who founded it a century ago, is in total darkness from mid-November through January. During the first part of November and in February, when the sun is well below the horizon, daytime is only indirect light, a brief period of bluish twilight.

But now, with the sun climbing closer to the horizon, each day is 20 minutes longer than the day before, and noticeably brighter. On Saturday, direct sunlight, with shadows and warmth, will arrive, starting with an actual sunrise. continued...