Abhijit Patil created this long-exposure image at Rocky Gorge in New Hampshire's White Mountain National Forest on January 5, 2019. "It's a tricky spot to shoot during the night," he wrote, "but the night views are spectacular and worth the risk."
Because Earth's orbit isn't precisely circular, the size of the sun in our sky changes slightly throughout the year. This image shows that small variation in sun size.
The Quadrantid meteor shower - which peaked on the night of January 3-4, 2019 - has a very narrow peak. Still, the EarthSky community caught some photos.
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.