Bruce McClure has served as lead writer for EarthSky's popular Tonight pages since 2004. He's a sundial aficionado, whose love for the heavens has taken him to Lake Titicaca in Bolivia and sailing in the North Atlantic, where he earned his celestial navigation certificate through the School of Ocean Sailing and Navigation. He also writes and hosts public astronomy programs and planetarium programs in and around his home in upstate New York.
Of the 5 bright planets, Mars and Jupiter appear in the December 2017 predawn sky all month. Mercury joins them around the December solstice. Venus and Saturn will become lost in the sun’s glare this month.