KECK OBSERVATORY CALENDAR FOR 2026 -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 2026 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 SUN FEB 01 18 24 19 03 19 29 18 14 05 42 06 08 06 47 03 57 08 29 14 11 10.2 0.0 0 0933 1622 16 MON FEB 02 18 25 19 04 19 30 19 14 05 41 06 08 06 46 04 02 08 32 14 14 10.2 0.0 0 1025 1024 29 TUE FEB 03 18 25 19 04 19 30 20 11 05 41 06 07 06 46 04 06 08 36 14 18 10.2 0.7 6 1114 0405 41 WED FEB 04 18 26 19 05 19 31 21 04 05 41 06 07 06 46 04 11 08 40 14 22 10.2 1.6 15 1200-0212 54 THU FEB 05 18 26 19 05 19 31 21 56 05 41 06 07 06 45 04 15 08 44 14 26 10.2 2.4 23 1246-0812 66 FRI FEB 06 18 27 19 06 19 32 22 47 05 40 06 06 06 45 04 20 08 48 14 29 10.1 3.2 32 1331-1341 77 SAT FEB 07 18 27 19 06 19 32 23 38 05 40 06 06 06 45 04 23 08 52 14 33 10.1 4.1 40 1417-1826 89 SUN FEB 08 18 28 19 07 19 32 00 30 05 40 06 06 06 44 04 27 08 56 14 37 10.1 5.0 49 1506-2237 >90 MON FEB 09 18 28 19 07 19 33 01 23 05 39 06 05 06 44 04 32 09 00 14 40 10.1 5.8 57 1556-2542 >90 TUE FEB 10 18 29 19 07 19 33 02 17 05 39 06 05 06 43 04 36 09 04 14 44 10.1 6.7 66 1648-2741 >90 WED FEB 11 18 29 19 08 19 34 03 10 05 39 06 04 06 43 04 41 09 08 14 48 10.1 7.6 75 1741-2825 >90 THU FEB 12 18 30 19 08 19 34 04 01 14 27 05 38 06 04 06 42 04 45 09 12 14 51 10.1 8.4 83 1835-2750 >90 FRI FEB 13 18 30 19 09 19 35 04 49 15 21 05 38 06 04 06 42 04 50 09 16 14 55 10.0 9.2 91 1928-2556 >90 SAT FEB 14 18 31 19 09 19 35 05 34 16 18 05 37 06 03 06 41 04 54 09 20 14 58 10.0 10.0 99 2021-2247 >90 SUN FEB 15 18 31 19 10 19 35 06 15 17 14 05 37 06 03 06 41 04 58 09 24 15 02 10.0 10.0 100 2111-1831 >90 MON FEB 16 18 32 19 10 19 36 06 53 18 10 05 36 06 02 06 40 05 03 09 28 15 05 10.0 10.0 100 2200-1320 >90 TUE FEB 17 18 32 19 10 19 36 19 06 05 36 06 01 06 40 05 07 09 32 15 09 10.0 10.0 100 2248-0729 >90 WED FEB 18 18 33 19 11 19 36 20 01 05 35 06 01 06 39 05 11 09 36 15 11 10.0 9.6 95 2336-0111 >90 THU FEB 19 18 33 19 11 19 37 20 57 05 35 06 00 06 38 05 16 09 39 15 15 10.0 8.6 86 0024 0515 >90 FRI FEB 20 18 33 19 11 19 37 21 55 05 34 06 00 06 38 05 20 09 43 15 18 9.9 7.7 76 0113 1132 >90 SAT FEB 21 18 34 19 12 19 38 22 55 05 34 05 59 06 37 05 25 09 47 15 22 9.9 6.7 66 0206 1720 >90 SUN FEB 22 18 34 19 12 19 38 23 59 05 33 05 59 06 36 05 29 09 51 15 25 9.9 5.6 56 0302 2215 >90 MON FEB 23 18 35 19 13 19 38 01 04 05 32 05 58 06 36 05 33 09 55 15 28 9.9 4.5 45 0402 2554 80 TUE FEB 24 18 35 19 13 19 39 02 10 05 32 05 57 06 35 05 37 09 59 15 32 9.9 3.4 34 0505 2758 67 WED FEB 25 18 35 19 13 19 39 03 12 05 31 05 57 06 34 05 41 10 03 15 35 9.9 2.3 23 0609 2810 54 THU FEB 26 18 36 19 14 19 39 04 09 05 30 05 56 06 34 05 45 10 07 15 38 9.9 1.3 13 0713 2629 40 FRI FEB 27 18 36 19 14 19 40 14 55 05 00 05 30 05 55 06 33 05 50 10 11 15 42 9.8 0.5 5 0814 2307 27 SAT FEB 28 18 37 19 14 19 40 15 59 05 44 05 29 05 55 06 32 05 54 10 15 15 45 9.8 0.0 0 0911 1824 15 ONE LINE REFERS TO EVENING DATE FULL MOON Feb 01 22:10 UT AND FOLLOWING MORNING. LAST QUARTER Feb 09 12:43 UT All dates and times are zone HST NEW MOON Feb 17 12:01 UT in upper table (except sid time). FIRST QUARTER Feb 24 12:28 UT