MAY 2021 OBSERVING Lunar Almanac Northern Hemisphere Sky Chart North α D G Va oub ala Op arbialb lests yxy e a D n G iff ecn lests trar Pl lob use luclsut atrar se an ul en et ar beub trer clu lual ar a y ne tsetre bu r la β Fa ε μ α α γ β κ ε δ URSA MINOR DR Little Dipper AC O γ γ η χ β β ub an α +60° Mizar & Alcor η M51 s α M5 β π S M AY 2 0 2 1 * S K Y & T E L E S C O P E IU May 27 P May 26 * Mare Undarum π * Short Crater δ May 25 4 * Phocylides Crater Planet location shown for mid-month g α γ R Diameter 33′ 26″ M 357,312 km α Spica O May 26, 02h UT Moon May 25 A C Perigee S Diameter 29′ 24″ α s re ta 406,512 km 1 2 3 4 An May 11, 22h UT FAVORABLE LIBRATIONS 42 -1 n Moo 22 y a M β BR γ n ci Fa Apogee ζ turu Arc δ LI 0 DISTANCES Th ES α (C δ 11:14 UT SE 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. ε 0° ζ 19:13 UT C B α US May 26 β VIRGO η May 19 β M3 ÖT S EN ) RP UT SE AP β M12 CH FULL MOON HIU FIRST QUARTER M10 19:00 UT OP DA) 19:50 UT β γ AU S (C May 11 US α PEN May 3 CEPHE n ci SER NEW MOON ζ δ Facing East LAST QUARTER BO 31 Zenith γ 30 ε 29 β 28 α 27 CORONA BOREALIS 26 M13 25 η 24 M92 23 β 22 ζ 21 ε 20 π 19 H 18 ERCULE S 17 δ Ve 16 α 15 ga 14 α 13 μ 12 A 11 R 10 LY M5 7 9 IC4665 8 M52 39 R ε o 7 70 6 AQUIL A 5 h 4 19 3 γ M S Al bi re 1 2 SIOPEIA 22 h C U V UL A S AT FRI THU UL WED PE C GI TUE TT A MOON PHASES N 7 SA 26 G M2 May 25 Y No Cr rth os er s n N ASA / LRO MON De ne b M 29 Yellow dots indicate which part of the Moon's limb is tipped the most toward Earth by libration. SUN g NE 27 16h LU PU CEN S θ TA U RUS ι -40° 13 Facing