This time, we're celebrating the 'blue hour', a period shortly before sunrise or after sunset when the sun is below the horizon but still provides enough light to make the sky appear deep blue in ...

After sunset is the blue hour. The sun is just below the horizon, and on a clear day, the remaining light scatters through the air, turning everything blue. At some point, you must have pushed out of ...

But it comes at the expense of evening light, as the sun will set an hour earlier. On Sunday, most of the United States will see sunrise before 7 a.m. again. But sunset will return to the 5 o ...