Looking for a sky event this week? Check out our full Sky This Week column. December 17: The Moon meets Mercury The Moon passes 6° south of Mercury at 7 A.M. EST, then passes 0.4° south of Antares at 8 A.

The world witnessed the December full moon at its peak around 6:14 p.m. ET. This month's full moon was a supermoon, according to NASA, making it appear 30% brighter and up to 14% larger than usual.