SEPTEMBER 2021 OBSERVING Lunar Almanac Northern Hemisphere Sky Chart 18 14 September 3 30 Yellow dots indicate which part of the Moon's limb is tipped the most toward Earth by libration. NASA / LRO MOON PHASES MON SUN TUE 1 5 12 19 26 6 13 20 27 7 14 21 28 8 15 22 29 WED 2 9 16 23 30 THU 3 10 17 24 FRI 4 11 18 25 Zenith SAT NEW MOON September 7 00:52 UT FULL MOON September 20 23:55 UT DISTANCES Perigee 368,462 km Apogee FIRST QUARTER September 13 20:39 UT LAST QUARTER September 29 01:57 UT September 11, 10h UT Diameter 32′ 26″ September 26, 22h UT 404,640 km Diameter 29′ 32″ FAVORABLE LIBRATIONS * Schickard Crater * Lacus Spei Planet location shown for mid-month September 3 September 14 * Mare Humboldtianum September 18 * Graff Crater 42 SEPTEMBER 2021 * SKY & TELESCOPE Galaxy Double star September 30 USING THE NORTHERN HEMISPHERE MAP Go out within an hour of a time listed to the right. Turn the map around so the yellow label for the direction you're facing is at the bottom. That's the horizon. The center of the map is overhead. Ignore the parts of the map above horizons you're not facing. Exact for latitude 40°N. CORONA AUSTRALIS n c i -1 1 2 3 4 M SCU -20° 19 g Deneb M29 C Y G N U S M15 E g -1 0 1 2 3 4 a Galaxy Double star Variable star Open cluster Diffuse nebula Globular cluster Planetary nebula Galaxy Double star Variable star Open cluster Diffuse nebula Globular cluster Planetary nebula C L S E 4h 1h F a 22h F a SA +60° +80° L Y N X r o N h E c i n g I P T I C M30 CAMELOPARDALIS α Double Cluster CAS S I OP E I A M34 P ERS EUS Algol θ C E P H E U S LACERTA ANDROMEDA β γ Albireo δ χ M39 γ α ε P E G A S U S G r e a t S q u a r e o f P e g a s u s c i n a VULPECULA M27 SAGITTA α Jupiter δ θ β DELPHINUS EQUULEUS Moon Sept 20 γ Water Jar A Q U A R I U S γ γ Altair β η λ µ α A Q U I L A ζ CAPRICORNUS TRIANGULUM P I S C E S A R I E S α Polaris β ξ ζ δ M52 γ γ β δ ε γ α β 61 Circlet s t M31 M33 M2 τ δ ε µ α β ε η β µ ζ α θ γ F α ε α β ζ δ Saturn a F g n c i E N h t Moon Sept 17