OBSERVING December 2015 In This Section 38 Sky at a Glance 38 Northern Hemisphere Sky Chart 39 Binocular Highlight: Betwixt & Between 40 Planetary Almanac 41 Northern Hemisphere's Sky: The Zero Hour 42 Sun, Moon & Planets: The Before Breakfast Club 44 Celestial Calendar 44 A Moonless Geminid Shower 45 Comet Catalina Glows at Dawn 46 Moon Occults Venus in a Sunny Blue Sky 46 Morning Action at Jupiter 48 Exploring the Moon: Humorum in the Eyepiece 50 Deep-Sky Wonders: Night's Serenity Additional Observing Article: 32 Binocular Holiday ESO / DIGITIZED SK Y SURVEY 2 / MARTINE DE MARTIN This wide-field image of Puppis includes several open star clusters, the brightest amongst them being Messier 47 (center); approximately a half degree east of M47 is the denser but more distant open cluster Messier 46 (left); see page 32. SkyandTelescope.com December 2015 37http://www.SkyandTelescope.com