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 WED FEB 01 18 24 19 03 19 29 14 50 05 08 05 42 06 08 06 47 03 56 08 27 14 10 10.2 0.6 5 0629 2735 28 THU FEB 02 18 25 19 04 19 30 15 41 05 57 05 41 06 08 06 46 04 01 08 31 14 13 10.2 0.0 0 0723 2653 17 FRI FEB 03 18 25 19 04 19 30 16 35 06 41 05 41 06 07 06 46 04 05 08 35 14 17 10.2 0.0 0 0815 2456 07 SAT FEB 04 18 26 19 05 19 31 17 28 05 41 06 07 06 46 04 10 08 39 14 21 10.2 0.0 0 0906 2152 07 SUN FEB 05 18 26 19 05 19 31 18 21 05 41 06 07 06 45 04 13 08 43 14 25 10.2 0.0 0 0955 1751 17 MON FEB 06 18 27 19 06 19 32 19 12 05 40 06 06 06 45 04 18 08 47 14 28 10.1 0.0 0 1041 1306 28 TUE FEB 07 18 27 19 06 19 32 20 02 05 40 06 06 06 45 04 22 08 51 14 32 10.1 0.5 4 1126 0749 39 WED FEB 08 18 28 19 07 19 32 20 52 05 40 06 06 06 44 04 26 08 55 14 36 10.1 1.3 13 1210 0211 51 THU FEB 09 18 28 19 07 19 33 21 42 05 39 06 05 06 44 04 31 08 59 14 39 10.1 2.2 21 1254-0335 62 FRI FEB 10 18 29 19 07 19 33 22 33 05 39 06 05 06 43 04 35 09 03 14 43 10.1 3.0 29 1339-0918 74 SAT FEB 11 18 29 19 08 19 34 23 26 05 39 06 04 06 43 04 40 09 07 14 47 10.1 3.9 38 1426-1438 86 SUN FEB 12 18 30 19 08 19 34 00 23 05 38 06 04 06 42 04 44 09 11 14 50 10.1 4.8 47 1518-1936 >90 MON FEB 13 18 30 19 09 19 35 01 24 05 38 06 04 06 42 04 49 09 15 14 54 10.0 5.8 57 1613-2338 >90 TUE FEB 14 18 31 19 09 19 35 02 27 05 37 06 03 06 41 04 53 09 19 14 57 10.0 6.9 68 1713-2625 >90 WED FEB 15 18 31 19 10 19 35 03 33 05 37 06 03 06 41 04 57 09 23 15 01 10.0 8.0 79 1817-2737 >90 THU FEB 16 18 32 19 10 19 36 04 36 14 57 05 36 06 02 06 40 05 02 09 27 15 04 10.0 9.0 89 1922-2656 >90 FRI FEB 17 18 32 19 10 19 36 05 35 16 05 05 36 06 01 06 40 05 06 09 31 15 07 10.0 10.0 99 2026-2421 >90 SAT FEB 18 18 33 19 11 19 36 06 27 17 14 05 35 06 01 06 39 05 10 09 34 15 10 10.0 10.0 100 2128-2007 >90 SUN FEB 19 18 33 19 11 19 37 18 22 05 35 06 00 06 38 05 15 09 38 15 14 10.0 10.0 100 2226-1436 >90 MON FEB 20 18 33 19 11 19 37 19 26 05 34 06 00 06 38 05 19 09 42 15 17 9.9 9.9 100 2321-0819 >90 TUE FEB 21 18 34 19 12 19 38 20 27 05 34 05 59 06 37 05 24 09 46 15 21 9.9 9.1 91 0013-0142 >90 WED FEB 22 18 34 19 12 19 38 21 26 05 33 05 59 06 36 05 28 09 50 15 24 9.9 8.1 81 0103 0450 >90 THU FEB 23 18 35 19 13 19 38 22 23 05 32 05 58 06 36 05 31 09 54 15 27 9.9 7.2 72 0152 1057 >90 FRI FEB 24 18 35 19 13 19 39 23 21 05 32 05 57 06 35 05 36 09 58 15 31 9.9 6.2 62 0242 1624 >90 SAT FEB 25 18 35 19 13 19 39 00 18 05 31 05 57 06 34 05 40 10 02 15 34 9.9 5.2 52 0335 2046 89 SUN FEB 26 18 36 19 14 19 39 01 15 05 30 05 56 06 34 05 44 10 06 15 37 9.9 4.2 43 0426 2423 78 MON FEB 27 18 36 19 14 19 40 02 10 05 30 05 55 06 33 05 49 10 10 15 41 9.8 3.3 33 0519 2639 66 TUE FEB 28 18 37 19 14 19 40 03 03 05 29 05 55 06 32 05 53 10 14 15 44 9.8 2.4 24 0613 2737 55 ONE LINE REFERS TO EVENING DATE FULL MOON Feb 05 18:31 UT AND FOLLOWING MORNING. LAST QUARTER Feb 13 16:03 UT All dates and times are zone HST NEW MOON Feb 20 07:05 UT in upper table (except sid time). FIRST QUARTER Feb 27 08:06 UT