The January 5-6, 2019, partial solar eclipse was visible from China, Korea, Japan, Russia, the North Pacific Ocean and the Aleutian Islands. Photo here from the EarthSky community.
These are called lenticular clouds. They usually - but not always - form where stable moist air flows over a mountain or range of mountains. They can form rapidly and then disappear again just as fast.
Giuseppe Pappa in Sicily, Italy, wrote on December 27, 2018: "The dust and the gas from Mount Etna gave us today this fantastic view during sunset time. The sun became very red due to volcanic ash in the sky."
A beautiful drama is taking place low in the east before sunup this week. Giant planet Jupiter and innermost planet Mercury have swept close, with dazzling Venus above. Photos here from the EarthSky community.