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 TUE DEC 01 17 52 18 32 18 59 01 06 05 23 05 50 06 30 23 21 04 23 09 47 10.4 6.1 58 1139-0031 >90 WED DEC 02 17 53 18 33 19 00 01 58 05 23 05 50 06 30 23 26 04 27 09 51 10.4 7.0 67 1225-0627 >90 THU DEC 03 17 53 18 33 19 00 02 51 14 15 05 24 05 51 06 31 23 30 04 31 09 56 10.4 7.8 75 1311-1200 >90 FRI DEC 04 17 53 18 33 19 00 03 43 14 51 05 24 05 51 06 32 23 34 04 35 10 00 10.4 8.7 83 1358-1658 >90 SAT DEC 05 17 53 18 33 19 00 04 37 15 30 05 25 05 52 06 32 23 38 04 39 10 05 10.4 9.6 92 1446-2109 >90 SUN DEC 06 17 53 18 34 19 01 05 32 16 11 05 25 05 52 06 33 23 43 04 43 10 09 10.4 10.4 100 1537-2424 >90 MON DEC 07 17 53 18 34 19 01 06 26 16 57 05 26 05 53 06 33 23 47 04 47 10 14 10.4 10.4 100 1628-2632 >90 TUE DEC 08 17 54 18 34 19 01 17 45 05 27 05 54 06 34 23 51 04 51 10 19 10.4 10.4 100 1721-2727 >90 WED DEC 09 17 54 18 34 19 01 18 37 05 27 05 54 06 35 23 55 04 55 10 23 10.4 10.4 100 1814-2707 >90 THU DEC 10 17 54 18 35 19 02 19 30 05 28 05 55 06 35 00 00 04 59 10 28 10.4 10.0 95 1905-2535 >90 FRI DEC 11 17 55 18 35 19 02 20 23 05 28 05 55 06 36 00 04 05 03 10 31 10.4 9.1 87 1955-2256 >90 SAT DEC 12 17 55 18 35 19 03 21 15 05 29 05 56 06 36 00 09 05 07 10 36 10.4 8.2 78 2043-1919 >90 SUN DEC 13 17 55 18 36 19 03 22 06 05 29 05 56 06 37 00 13 05 10 10 40 10.4 7.4 70 2129-1456 >90 MON DEC 14 17 56 18 36 19 03 22 56 05 30 05 57 06 38 00 17 05 14 10 45 10.5 6.6 62 2214-0954 >90 TUE DEC 15 17 56 18 37 19 04 23 46 05 30 05 58 06 38 00 22 05 18 10 49 10.4 5.7 54 2258-0424 >90 WED DEC 16 17 56 18 37 19 04 00 37 05 31 05 58 06 39 00 25 05 22 10 54 10.4 4.9 46 2343 0122 85 THU DEC 17 17 57 18 37 19 05 01 30 05 32 05 59 06 39 00 30 05 26 10 59 10.4 4.0 38 0029 0723 73 FRI DEC 18 17 57 18 38 19 05 02 27 05 32 05 59 06 40 00 34 05 30 11 03 10.4 3.1 29 0119 1316 60 SAT DEC 19 17 58 18 38 19 05 03 28 05 33 06 00 06 40 00 38 05 34 11 08 10.5 2.1 19 0213 1842 47 SUN DEC 20 17 58 18 39 19 06 14 30 04 34 05 33 06 00 06 41 00 43 05 38 11 12 10.4 1.0 9 0312 2316 34 MON DEC 21 17 59 18 39 19 06 15 23 05 43 05 34 06 01 06 41 00 47 05 42 11 17 10.5 0.0 0 0416 2627 21 TUE DEC 22 17 59 18 40 19 07 16 25 06 52 05 34 06 01 06 42 00 52 05 46 11 21 10.4 0.0 0 0525 2745 09 WED DEC 23 18 00 18 40 19 07 17 33 05 35 06 02 06 42 00 56 05 50 11 26 10.5 0.0 0 0635 2653 13 THU DEC 24 18 00 18 41 19 08 18 44 05 35 06 02 06 43 01 01 05 54 11 30 10.5 0.0 0 0742 2358 25 FRI DEC 25 18 01 18 41 19 08 19 54 05 36 06 03 06 43 01 05 05 58 11 35 10.5 0.8 7 0845 1923 39 SAT DEC 26 18 01 18 42 19 09 21 00 05 36 06 03 06 44 01 10 06 02 11 39 10.5 1.9 17 0943 1341 53 SUN DEC 27 18 02 18 42 19 10 22 01 05 36 06 04 06 44 01 15 06 06 11 43 10.4 2.9 27 1036 0724 66 MON DEC 28 18 02 18 43 19 10 22 59 05 37 06 04 06 44 01 19 06 10 11 48 10.5 3.8 36 1125 0059 79 TUE DEC 29 18 03 18 44 19 11 23 53 05 37 06 04 06 45 01 24 06 14 11 51 10.4 4.7 45 1209-0449 >90 WED DEC 30 18 04 18 44 19 11 00 47 05 38 06 05 06 45 01 28 06 17 11 56 10.5 5.6 53 1300-1059 >90 THU DEC 31 18 04 18 45 19 12 01 39 05 38 06 05 06 46 01 33 06 21 12 00 10.4 6.4 61 1347-1608 >90 ONE LINE REFERS TO EVENING DATE LAST QUARTER Dec 01 06:08 UT AND FOLLOWING MORNING. NEW MOON Dec 09 00:50 UT All dates and times are zone HST FIRST QUARTER Dec 17 05:44 UT in upper table (except sid time). FULL MOON Dec 24 01:29 UT LAST QUARTER Dec 30 18:59 UT