Arizona has some of the prettiest sunsets, but why? There's a science behind it. Here's what to know, including sunset times ...

People in Norfolk were treated to a spectacular sunset as the sky turned shades of purple, pink and orange. BBC Weather Watches sent in vivid images taken from across the county on Sunday afternoon.

Purple reign: The weather conditions created ... "more vibrant pink and purple colours during sunrise and sunset". The colour of the sky is determined by the scattering of the sun's light rays ...