Advertisers in This Issue Astronomy equipment manufacturers and dealers are a valuable resource for amateur and professional astronomers alike. Patronize our advertisers in this issue and enjoy all the benefits of their expertise. Product Locator Astro-Physics »page 81 mounts / telescopes astro-physics.com Celestron »back cover accessories / binoculars / mounts / telescopes celestron.com Firefly Books »page 3 publisher fireflybooks.com iOptron »page 79 mounts / telescopes ioptron.com QHYCCD Light Speed Vision »page 1 cameras qhyccd.com Sky-Watcher »inside front cover binoculars / mounts / telescopes skywatcherusa.com Stellarvue »inside back cover eyepieces / telescopes stellarvue.com Ad Index American Astronomical Society ............ 5, 73 Arizona Sky Village Portal ......................... 80 Astro-Physics .......................................... 81 Astro-World ............................................. 81 Bob's Knobs ............................................. 81 Casitas de Gila Guesthouses .................... 80 Celestron ................................................. C4 DIRECTV .................................................. 81 Firefly Books .............................................. 3 iOptron .................................................... 79 Knightware .............................................. 80 Lunatico Astronomia ................................ 80 MobileHelp .............................................. 83 NexDome ................................................. 81 Nine Planets Ring .................................... 81 Precise Parts ........................................... 80 QHYCCD Light Speed Vision ....................... 1 Revolution Imager .................................... 81 Sky & Telescope ...........................71, 79, 83 Sky-Watcher ............................................ C2 Stellarvue ................................................ C3 Technical Innovations ......................... 80, 81 The Liquid Sun ......................................... 80 The NASA Letters ..................................... 80 The Star of Bethlehem ............................. 79 William Optics .......................................... 81 To advertise in our Product Locator, please email Rod Nenner at: ads@skyandtelescope.org 82 DECEMBER 2023 * SKY & TELESCOPEhttp://www.astro-physics.com http://www.qhyccd.com http://www.celestron.com http://www.skywatcherusa.com http://www.fireflybooks.com http://www.stellarvue.com http://www.ioptron.com