KECK OBSERVATORY CALENDAR FOR 2023 -ASTRONOMICAL (computed for altitude 4160.0 m) ASTRONOMICAL(18 deg) TWILIGHT/DAWN MOON(midnight) DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (18 deg) Zenith 2023 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ RA DEC Dist 12 18 18 12 18 18 h h % h m d m deg SAT APR 01 18 46 19 24 19 50 15 00 04 33 05 02 05 28 06 06 08 09 12 20 17 23 9.2 0.5 5 1011 1558 31 SUN APR 02 18 46 19 24 19 50 15 51 05 07 05 01 05 27 06 05 08 13 12 24 17 26 9.2 0.0 0 1057 1054 23 MON APR 03 18 47 19 24 19 51 16 42 05 40 05 00 05 26 06 04 08 18 12 28 17 29 9.1 0.0 0 1142 0519 18 TUE APR 04 18 47 19 25 19 51 17 32 06 12 04 59 05 25 06 03 08 22 12 32 17 32 9.1 0.0 0 1227-0036 20 WED APR 05 18 47 19 25 19 51 18 23 06 46 04 58 05 24 06 02 08 26 12 36 17 35 9.1 0.0 0 1313-0636 28 THU APR 06 18 47 19 25 19 52 19 17 04 57 05 23 06 01 08 31 12 40 17 38 9.1 0.0 0 1400-1227 38 FRI APR 07 18 48 19 26 19 52 20 12 04 56 05 22 06 00 08 35 12 44 17 41 9.1 0.3 3 1451-1751 49 SAT APR 08 18 48 19 26 19 52 21 11 04 55 05 21 06 00 08 39 12 48 17 43 9.0 1.3 14 1545-2228 61 SUN APR 09 18 48 19 26 19 53 22 12 04 54 05 20 05 59 08 44 12 52 17 46 9.0 2.3 25 1643-2557 72 MON APR 10 18 48 19 27 19 53 23 15 04 53 05 20 05 58 08 48 12 56 17 49 9.0 3.4 37 1744-2751 84 TUE APR 11 18 49 19 27 19 53 00 18 04 52 05 19 05 57 08 52 12 59 17 52 9.0 4.4 49 1847-2811 >90 WED APR 12 18 49 19 27 19 54 01 16 04 51 05 18 05 56 08 57 13 03 17 55 9.0 5.4 59 1950-2641 >90 THU APR 13 18 49 19 28 19 54 02 09 04 50 05 17 05 55 09 01 13 07 17 58 8.9 6.3 69 2051-2330 >90 FRI APR 14 18 50 19 28 19 55 02 57 04 50 05 16 05 55 09 06 13 11 18 02 8.9 7.0 78 2148-1857 >90 SAT APR 15 18 50 19 29 19 55 03 41 14 52 04 49 05 15 05 54 09 10 13 15 18 05 8.9 7.8 87 2242-1321 >90 SUN APR 16 18 50 19 29 19 56 04 21 15 53 04 48 05 14 05 53 09 15 13 19 18 08 8.9 8.4 94 2334-0706 >90 MON APR 17 18 51 19 29 19 56 04 58 16 52 04 47 05 14 05 52 09 18 13 23 18 11 8.9 8.9 100 0024-0034 >90 TUE APR 18 18 51 19 30 19 56 05 36 17 50 04 46 05 13 05 51 09 22 13 27 18 14 8.8 8.8 100 0113 0554 >90 WED APR 19 18 51 19 30 19 57 06 14 18 48 04 45 05 12 05 51 09 27 13 31 18 17 8.8 8.8 100 0203 1159 >90 THU APR 20 18 52 19 30 19 57 06 55 19 47 04 44 05 11 05 50 09 31 13 35 18 20 8.8 8.8 100 0254 1723 >90 FRI APR 21 18 52 19 31 19 58 20 46 04 43 05 10 05 49 09 36 13 39 18 23 8.7 8.0 90 0347 2149 >90 SAT APR 22 18 52 19 31 19 58 21 46 04 42 05 09 05 49 09 40 13 43 18 26 8.7 6.9 79 0441 2504 >90 SUN APR 23 18 53 19 32 19 59 22 43 04 42 05 09 05 48 09 45 13 47 18 30 8.7 6.0 68 0536 2659 >90 MON APR 24 18 53 19 32 19 59 23 38 04 41 05 08 05 47 09 49 13 51 18 33 8.7 5.1 58 0631 2731 >90 TUE APR 25 18 53 19 32 20 00 00 28 04 40 05 07 05 46 09 54 13 55 18 35 8.7 4.2 48 0726 2636 87 WED APR 26 18 54 19 33 20 00 01 14 04 39 05 06 05 46 09 58 13 59 18 38 8.7 3.4 39 0817 2437 78 THU APR 27 18 54 19 33 20 01 01 54 04 38 05 06 05 45 10 03 14 03 18 41 8.6 2.7 31 0907 2129 68 FRI APR 28 18 54 19 34 20 01 02 31 04 37 05 05 05 44 10 07 14 07 18 44 8.6 2.1 24 0955 1726 59 SAT APR 29 18 55 19 34 20 02 03 06 04 37 05 04 05 44 10 12 14 10 18 48 8.6 1.5 17 1041 1239 51 SUN APR 30 18 55 19 35 20 02 14 33 03 39 04 36 05 03 05 43 10 16 14 14 18 51 8.6 0.9 11 1125 0716 43 ONE LINE REFERS TO EVENING DATE FULL MOON Apr 06 04:36 UT AND FOLLOWING MORNING. LAST QUARTER Apr 13 09:11 UT All dates and times are zone HST NEW MOON Apr 20 04:13 UT in upper table (except sid time). FIRST QUARTER Apr 27 21:19 UT