DIY PHOTOMETRY: JUPITER AND SATURN: 10 YEARS LATER: Deciphering Starlight Closest Encounter Since 1623 Diversity in Astronomy PAGE 60 PAGE 46 PAGE 84 THE ESSENTIAL GUIDE TO ASTRONOMY DECEMBER 2020 Geminids Get Ready for the Year's Best Meteor Shower Page 14 skyandtelescope.org Celebrating the Caldwell Catalog The Chemistry of Earth's Creation Solar Eclipse Botany Page 20 Page 34 Page 58http://www.skyandtelescope.org