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 THU OCT 01 18 21 18 58 19 24 22 11 05 00 05 25 06 03 19 46 00 23 05 23 9.6 2.8 28 0537 2746 71 FRI OCT 02 18 20 18 57 19 23 23 15 05 00 05 26 06 03 19 49 00 27 05 27 9.6 3.9 40 0641 2649 84 SAT OCT 03 18 19 18 57 19 22 00 21 05 00 05 26 06 03 19 52 00 31 05 31 9.6 5.0 51 0743 2413 >90 SUN OCT 04 18 18 18 56 19 21 01 25 14 26 05 00 05 26 06 04 19 55 00 34 05 35 9.6 6.1 62 0841 2008 >90 MON OCT 05 18 17 18 55 19 20 02 26 15 11 05 01 05 26 06 04 19 58 00 38 05 40 9.7 7.1 73 0935 1500 >90 TUE OCT 06 18 16 18 54 19 19 03 25 15 51 05 01 05 26 06 04 20 01 00 42 05 44 9.7 8.1 83 1025 0911 >90 WED OCT 07 18 16 18 53 19 19 04 21 16 29 05 01 05 27 06 04 20 05 00 46 05 48 9.7 9.0 93 1113 0302 >90 THU OCT 08 18 15 18 52 19 18 05 15 17 04 05 01 05 27 06 05 20 07 00 50 05 52 9.7 9.7 100 1200-0309 >90 FRI OCT 09 18 14 18 52 19 17 06 09 17 39 05 02 05 27 06 05 20 10 00 54 05 57 9.8 9.8 100 1247-0907 >90 SAT OCT 10 18 13 18 51 19 16 18 16 05 02 05 27 06 05 20 13 00 58 06 01 9.8 9.8 100 1334-1435 >90 SUN OCT 11 18 12 18 50 19 15 18 54 05 02 05 28 06 05 20 16 01 02 06 05 9.8 9.8 100 1422-1922 >90 MON OCT 12 18 12 18 49 19 15 19 35 05 02 05 28 06 06 20 20 01 06 06 09 9.8 9.4 96 1512-2314 >90 TUE OCT 13 18 11 18 48 19 14 20 19 05 03 05 28 06 06 20 23 01 10 06 14 9.8 8.7 88 1604-2602 >90 WED OCT 14 18 10 18 48 19 13 21 07 05 03 05 29 06 06 20 26 01 14 06 18 9.8 7.9 80 1656-2737 >90 THU OCT 15 18 09 18 47 19 12 21 58 05 03 05 29 06 07 20 29 01 18 06 22 9.8 7.1 71 1750-2757 >90 FRI OCT 16 18 08 18 46 19 12 22 51 05 04 05 29 06 07 20 33 01 22 06 27 9.9 6.2 63 1842-2701 >90 SAT OCT 17 18 08 18 46 19 11 23 44 05 04 05 29 06 07 20 36 01 26 06 31 9.9 5.3 53 1934-2452 >90 SUN OCT 18 18 07 18 45 19 10 00 38 05 04 05 30 06 08 20 39 01 30 06 34 9.9 4.4 44 2025-2132 85 MON OCT 19 18 06 18 44 19 10 01 30 05 04 05 30 06 08 20 43 01 34 06 38 9.9 3.6 36 2113-1724 74 TUE OCT 20 18 06 18 43 19 09 14 19 02 23 05 05 05 30 06 08 20 46 01 38 06 43 9.9 2.7 27 2200-1221 62 WED OCT 21 18 05 18 43 19 08 14 54 03 15 05 05 05 31 06 09 20 49 01 41 06 47 10.0 1.8 18 2247-0638 50 THU OCT 22 18 04 18 42 19 08 15 29 04 09 05 05 05 31 06 09 20 53 01 45 06 51 10.0 0.9 9 2334-0027 38 FRI OCT 23 18 04 18 42 19 07 16 04 05 05 05 06 05 31 06 09 20 56 01 49 06 56 10.0 0.0 0 0023 0556 25 SAT OCT 24 18 03 18 41 19 07 16 42 06 04 05 06 05 32 06 10 21 00 01 53 07 00 10.0 0.0 0 0114 1212 12 SUN OCT 25 18 02 18 40 19 06 17 23 05 06 05 32 06 10 21 02 01 57 07 04 10.0 0.0 0 0209 1759 03 MON OCT 26 18 02 18 40 19 06 18 09 05 07 05 32 06 10 21 06 02 01 07 09 10.0 0.0 0 0309 2248 16 TUE OCT 27 18 01 18 39 19 05 19 02 05 07 05 33 06 11 21 09 02 05 07 13 10.0 0.0 0 0412 2610 30 WED OCT 28 18 00 18 39 19 05 20 02 05 07 05 33 06 11 21 13 02 09 07 17 10.0 0.9 9 0519 2742 44 THU OCT 29 18 00 18 38 19 04 21 07 05 08 05 33 06 12 21 16 02 13 07 22 10.1 2.0 20 0625 2715 58 FRI OCT 30 17 59 18 38 19 04 22 14 05 08 05 34 06 12 21 20 02 17 07 26 10.1 3.2 31 0729 2456 71 SAT OCT 31 17 59 18 37 19 03 23 19 05 08 05 34 06 13 21 23 02 21 07 30 10.1 4.3 42 0828 2102 85 ONE LINE REFERS TO EVENING DATE LAST QUARTER Oct 03 13:25 UT AND FOLLOWING MORNING. NEW MOON Oct 10 15:48 UT All dates and times are zone HST FIRST QUARTER Oct 18 16:13 UT in upper table (except sid time). FULL MOON Oct 26 04:11 UT