It's the start of Winter in the Northern Hemisphere (Summer on the other side of the equator). Rendered in Catfood Earth.
This is the first time I've been late with a solstice or equinox post. On the 21st of December at 10:44 UTC it was the start of Winter for the Northern hemisphere, Summer down south. Rendered in Catfood Earth (back dated to the right date and time... Windows, Android).