As December unfolds, winter’s official arrival comes at 9:03 a.m. on Sunday, December 21. At that precise moment, the sun halts over the Tropic of Capricorn and begins its journey north, signaling the start of a new season.

December concludes the year with holiday festivities and the winter solstice. Though often clouded, it still offers a captivating look at the sky and the season’s defining moments. Despite fewer clear nights, there remains much to see above.