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 JAN 01 18 05 18 45 19 12 16 08 06 37 05 39 06 06 06 46 01 38 06 26 12 06 10.4 0.0 0 0550 2823 12 FRI JAN 02 18 06 18 46 19 13 17 16 05 39 06 06 06 46 01 42 06 30 12 10 10.4 0.0 0 0659 2711 10 SAT JAN 03 18 06 18 47 19 14 18 25 05 39 06 06 06 47 01 47 06 34 12 14 10.4 0.0 0 0804 2403 21 SUN JAN 04 18 07 18 47 19 14 19 32 05 40 06 07 06 47 01 51 06 38 12 19 10.4 0.3 2 0903 1925 34 MON JAN 05 18 07 18 48 19 15 20 34 05 40 06 07 06 47 01 56 06 42 12 23 10.4 1.3 12 0958 1351 47 TUE JAN 06 18 08 18 48 19 15 21 31 05 40 06 07 06 47 02 00 06 46 12 27 10.4 2.3 21 1047 0748 60 WED JAN 07 18 09 18 49 19 16 22 25 05 41 06 07 06 48 02 05 06 50 12 32 10.4 3.1 30 1134 0138 72 THU JAN 08 18 09 18 50 19 16 23 16 05 41 06 08 06 48 02 09 06 54 12 36 10.4 4.0 38 1219-0419 83 FRI JAN 09 18 10 18 50 19 17 00 06 05 41 06 08 06 48 02 14 06 58 12 40 10.4 4.8 46 1303-1002 >90 SAT JAN 10 18 11 18 51 19 18 00 56 05 41 06 08 06 48 02 19 07 02 12 44 10.4 5.6 54 1348-1512 >90 SUN JAN 11 18 11 18 51 19 18 01 47 05 42 06 08 06 48 02 23 07 06 12 49 10.4 6.5 62 1434-1943 >90 MON JAN 12 18 12 18 52 19 19 02 39 05 42 06 09 06 49 02 28 07 10 12 53 10.4 7.3 70 1522-2326 >90 TUE JAN 13 18 12 18 53 19 19 03 33 14 07 05 42 06 09 06 49 02 32 07 14 12 57 10.4 8.2 79 1612-2611 >90 WED JAN 14 18 13 18 53 19 20 04 26 14 53 05 42 06 09 06 49 02 37 07 18 13 00 10.4 9.1 87 1704-2748 >90 THU JAN 15 18 14 18 54 19 20 05 19 15 43 05 42 06 09 06 49 02 41 07 22 13 04 10.4 10.0 96 1757-2810 >90 FRI JAN 16 18 14 18 54 19 21 06 09 16 36 05 42 06 09 06 49 02 46 07 25 13 08 10.3 10.3 100 1851-2712 >90 SAT JAN 17 18 15 18 55 19 22 06 56 17 32 05 42 06 09 06 49 02 51 07 29 13 12 10.3 10.3 100 1944-2456 >90 SUN JAN 18 18 16 18 55 19 22 18 29 05 43 06 09 06 49 02 55 07 33 13 17 10.3 10.3 100 2036-2128 >90 MON JAN 19 18 16 18 56 19 23 19 24 05 43 06 09 06 49 03 00 07 37 13 21 10.3 10.3 99 2126-1659 >90 TUE JAN 20 18 17 18 57 19 23 20 19 05 43 06 09 06 49 03 03 07 41 13 25 10.3 9.4 90 2214-1141 >90 WED JAN 21 18 18 18 57 19 24 21 13 05 43 06 09 06 49 03 08 07 45 13 29 10.3 8.5 82 2300-0547 >90 THU JAN 22 18 18 18 58 19 24 22 07 05 43 06 09 06 49 03 12 07 49 13 33 10.3 7.6 73 2347 0027 >90 FRI JAN 23 18 19 18 58 19 25 23 03 05 43 06 09 06 49 03 17 07 53 13 37 10.3 6.7 64 0035 0647 >90 SAT JAN 24 18 19 18 59 19 25 00 00 05 43 06 09 06 49 03 21 07 57 13 41 10.3 5.7 55 0130 1225 >90 SUN JAN 25 18 20 18 59 19 26 01 01 05 43 06 09 06 48 03 26 08 01 13 45 10.3 4.7 45 0218 1833 80 MON JAN 26 18 21 19 00 19 26 02 06 05 43 06 09 06 48 03 30 08 05 13 49 10.3 3.6 35 0315 2317 67 TUE JAN 27 18 21 19 01 19 27 03 12 05 42 06 09 06 48 03 35 08 09 13 52 10.2 2.5 24 0417 2640 53 WED JAN 28 18 22 19 01 19 27 04 19 05 42 06 09 06 48 03 39 08 13 13 56 10.2 1.4 13 0523 2818 40 THU JAN 29 18 22 19 02 19 28 14 56 05 22 05 42 06 08 06 48 03 44 08 17 14 00 10.2 0.3 3 0630 2756 26 FRI JAN 30 18 23 19 02 19 28 16 03 06 18 05 42 06 08 06 47 03 48 08 21 14 04 10.2 0.0 0 0735 2536 12 SAT JAN 31 18 24 19 03 19 29 17 10 05 42 06 08 06 47 03 53 08 25 14 08 10.2 0.0 0 0836 2136 03 ONE LINE REFERS TO EVENING DATE FULL MOON Jan 03 10:03 UT AND FOLLOWING MORNING. LAST QUARTER Jan 10 15:48 UT All dates and times are zone HST NEW MOON Jan 18 19:53 UT in upper table (except sid time). FIRST QUARTER Jan 26 04:47 UT