It doesn't just occur in clouds; it can appear in clear air, in the ocean, and even in the atmosphere ... fluctus clouds are more likely to appear around sunrise or sunset, which is when lower ...

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

also referred to by some as pancake or UFO clouds. At their most spectacular around sunrise or sunset when illuminated by the low sun, they need the right weather patterns to make an appearance ...