New York City's new High Line Park repurposes an old elevated railroad track along the west side of lower Manhattan for strolling and people-watching high above the bustle of downtown streets. Trees and flowers grow out of the old track bed, blooming between the ties, while in the distance is the river, the skyscrapers, the restaurants and nightclubs, and, along this stretch of the route, the warehouses of the old meatpacking district.
On June 30, 2011, rhe cloud at the righthand side of the sky in this picture cast a big shadow over the West Arm of Grand Traverse Bay, near Traverse City, Michigan. That's because the sun had already set, and its last rays were hitting the cloud from a very low angle, well below the horizon.
The top of the shadow looks curved, I'm told, because of the extremely wide angle of vision here. It's a perspective thing–we think of the horizon line off in the distance as a straight line, but in a wide-angled scene like this we can see that it's actually a curved arc. For a few minutes, the shadow darkens a wedge of the celestial sphere; then this part of the world turns away and the scene is in serious earth shadow, not just cloud shadow, till morning.
On Mars, the sun just isn't that big a deal. NASA's Mars rover Opportunity schedules regular photoshoots of the sunset, however, to calibrate the level and distribution of atmospheric dust. The series of sunset pictures taken in November has been gussied up and turned into a video, complete with a soundtrack of Christmas music: "I'm dreaming of a blue sunset."
On December 29, 2010, sunrise in Reykjavik, Iceland, will be at 11:23 a.m., and sunset will come just a little over four hours later, at 3:36 p.m. So if this road into the mountains outside of town is the route recommended by the GPS . . . well, maybe try again in a few months, when the daylight last a little longer?
The Icelandic word on the warning sign translates into English as unable, more or less.