Just published - a useful astronomer's book of celestial maps OBSERVER'S SKY ATLAS The 500 Best Deep-Sky Objects with Charts and Images, 4th Edition by Erich Karkoschka This stunning new edition of a classic guide is now bigger, updated and in full color. Useful for beginners and old hands, it contains charts on all 110 Messier objects plus 140 nebulae for 250 in all; plus 140 in-depth charts for additional objects and 110 fainter objects. Packed with data, charts and photos, this is the new ideal reference. 144 pages in color ยท hardcover, $39.95 IN BOOKSTORES AND ONLINE Published by Prepare for power Contact a Generac dealer for full terms and conditions outages today WITH A HOME STANDBY GENERATOR (844) 515-1840 $0 MONEY DOWN + LOW MONTHLY PAYMENT OPTIONS REQUEST A FREE QUOTE CALL NOW BEFORE THE NEXT POWER OUTAGE *To qualify, consumers must request a quote, purchase, install and activate the generator with a participating dealer. Call for a full list of terms and conditions. sk yand tele scope .o r g * JUNE 2023 3 7- FREEYear Extended Warranty* A $695 Value!http://WWW.FIREFLYBOOKS.COM https://skyandtelescope.org/