Readers’ photos celebrate sunrises and sunsets, when the light is the most pleasing. Fifty-one photos were sent in; here are ...

What does a sunset on the moon look like? Abrupt, brief, dramatic. Since the moon has no atmosphere, day turns to night as soon as the sun dips below the horizon. It goes from hot to cold in seconds.

There’s nothing quite like a sunset hike–hiking up through a forest aglow with light as the sun dips closer to the horizon, ...