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 TUE AUG 01 19 10 19 50 20 19 19 21 04 38 05 06 05 47 16 39 20 21 01 00 8.3 0.0 0 2133-2010 44 WED AUG 02 19 09 19 50 20 18 20 09 04 39 05 07 05 47 16 42 20 25 01 05 8.4 0.0 0 2233-1413 46 THU AUG 03 19 09 19 49 20 17 20 52 04 39 05 07 05 48 16 45 20 29 01 09 8.4 0.6 6 2328-0732 52 FRI AUG 04 19 08 19 48 20 17 21 32 04 40 05 08 05 48 16 49 20 33 01 14 8.4 1.2 14 0021-0038 59 SAT AUG 05 19 07 19 48 20 16 22 10 04 40 05 08 05 48 16 52 20 37 01 18 8.4 1.9 22 0112 0604 68 SUN AUG 06 19 07 19 47 20 15 22 48 04 41 05 09 05 49 16 55 20 41 01 23 8.4 2.5 30 0202 1213 77 MON AUG 07 19 06 19 46 20 14 23 27 04 41 05 09 05 49 16 58 20 45 01 26 8.4 3.2 38 0253 1732 86 TUE AUG 08 19 06 19 46 20 14 00 09 04 42 05 09 05 50 17 02 20 49 01 31 8.5 3.9 46 0346 2155 >90 WED AUG 09 19 05 19 45 20 13 00 54 14 10 04 42 05 10 05 50 17 05 20 53 01 35 8.5 4.7 55 0439 2504 >90 THU AUG 10 19 05 19 44 20 12 01 43 15 08 04 43 05 10 05 50 17 08 20 57 01 40 8.5 5.5 64 0533 2654 >90 FRI AUG 11 19 04 19 44 20 11 02 35 16 03 04 43 05 11 05 51 17 11 21 00 01 44 8.5 6.4 75 0628 2723 >90 SAT AUG 12 19 03 19 43 20 11 03 29 16 55 04 44 05 11 05 51 17 15 21 04 01 49 8.6 7.3 85 0721 2632 >90 SUN AUG 13 19 03 19 42 20 10 04 23 17 42 04 44 05 12 05 51 17 18 21 08 01 53 8.6 8.2 95 0813 2429 >90 MON AUG 14 19 02 19 41 20 09 05 17 18 24 04 44 05 12 05 51 17 21 21 12 01 57 8.6 8.6 100 0902 2122 >90 TUE AUG 15 19 01 19 41 20 08 06 08 19 03 04 45 05 12 05 52 17 24 21 16 02 02 8.6 8.6 100 0949 1724 >90 WED AUG 16 19 01 19 40 20 07 06 58 19 37 04 45 05 13 05 52 17 27 21 20 02 06 8.6 8.6 100 1033 1245 >90 THU AUG 17 19 00 19 39 20 06 20 10 04 46 05 13 05 52 17 29 21 24 02 11 8.7 8.6 99 1116 0738 >90 FRI AUG 18 18 59 19 38 20 06 20 41 04 46 05 13 05 53 17 33 21 28 02 15 8.7 8.1 93 1158 0211 >90 SAT AUG 19 18 58 19 37 20 05 21 12 04 47 05 14 05 53 17 36 21 32 02 20 8.7 7.6 87 1240-0324 >90 SUN AUG 20 18 58 19 37 20 04 21 44 04 47 05 14 05 53 17 39 21 36 02 24 8.7 7.0 80 1323-0858 >90 MON AUG 21 18 57 19 36 20 03 22 18 04 48 05 15 05 54 17 42 21 40 02 29 8.8 6.5 74 1408-1420 >90 TUE AUG 22 18 56 19 35 20 02 22 56 04 48 05 15 05 54 17 45 21 44 02 33 8.8 5.9 66 1457-1916 >90 WED AUG 23 18 55 19 34 20 01 23 39 04 48 05 15 05 54 17 48 21 48 02 37 8.8 5.2 58 1549-2330 >90 THU AUG 24 18 54 19 33 20 00 00 29 04 49 05 16 05 54 17 51 21 52 02 42 8.8 4.3 49 1647-2635 87 FRI AUG 25 18 54 19 32 19 59 14 04 01 26 04 49 05 16 05 55 17 54 21 56 02 45 8.8 3.4 38 1748-2823 77 SAT AUG 26 18 53 19 32 19 58 15 07 02 30 04 49 05 16 05 55 17 57 22 00 02 49 8.8 2.3 26 1853-2824 66 SUN AUG 27 18 52 19 31 19 57 16 09 03 38 04 50 05 16 05 55 18 00 22 04 02 54 8.9 1.2 13 1959-2623 55 MON AUG 28 18 51 19 30 19 56 17 05 04 47 04 50 05 17 05 55 18 03 22 08 02 58 8.9 0.1 0 2104-2229 45 TUE AUG 29 18 50 19 29 19 55 17 56 05 54 04 51 05 17 05 56 18 06 22 11 03 03 8.9 0.0 0 2205-1702 37 WED AUG 30 18 50 19 28 19 54 18 42 06 59 04 51 05 17 05 56 18 09 22 15 03 07 9.0 0.0 0 2303-1031 32 THU AUG 31 18 49 19 27 19 53 19 24 04 51 05 18 05 56 18 12 22 19 03 11 9.0 0.0 0 2357-0328 34 ONE LINE REFERS TO EVENING DATE FULL MOON Aug 01 18:31 UT AND FOLLOWING MORNING. LAST QUARTER Aug 08 10:27 UT All dates and times are zone HST NEW MOON Aug 16 09:37 UT in upper table (except sid time). FIRST QUARTER Aug 24 09:57 UT FULL MOON Aug 31 01:36 UT