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 WED APR 01 18 46 19 24 19 50 18 26 06 39 05 02 05 28 06 06 08 10 12 21 17 24 9.2 0.0 0 1256-0952 31 THU APR 02 18 46 19 24 19 50 19 18 05 01 05 27 06 05 08 14 12 25 17 27 9.2 0.0 0 1343-1520 40 FRI APR 03 18 47 19 24 19 51 20 10 05 00 05 26 06 04 08 19 12 29 17 30 9.1 0.3 3 1431-2007 50 SAT APR 04 18 47 19 25 19 51 21 04 04 59 05 25 06 03 08 23 12 33 17 33 9.1 1.2 13 1520-2359 60 SUN APR 05 18 47 19 25 19 51 21 57 04 58 05 24 06 02 08 27 12 37 17 36 9.1 2.1 23 1612-2647 70 MON APR 06 18 47 19 25 19 52 22 51 04 57 05 23 06 01 08 32 12 41 17 39 9.1 3.0 32 1705-2818 80 TUE APR 07 18 48 19 26 19 52 23 43 04 56 05 22 06 00 08 36 12 45 17 42 9.1 3.9 42 1757-2825 90 WED APR 08 18 48 19 26 19 52 00 33 04 55 05 21 06 00 08 40 12 49 17 45 9.0 4.7 51 1853-2736 >90 THU APR 09 18 48 19 26 19 53 01 19 04 54 05 20 05 59 08 45 12 53 17 47 9.0 5.4 60 1945-2519 >90 FRI APR 10 18 48 19 27 19 53 02 02 04 53 05 20 05 58 08 49 12 57 17 50 9.0 6.2 68 2036-2152 >90 SAT APR 11 18 49 19 27 19 53 02 42 04 52 05 19 05 57 08 53 13 01 17 53 9.0 6.8 75 2126-1725 >90 SUN APR 12 18 49 19 27 19 54 03 19 14 38 04 51 05 18 05 56 08 58 13 05 17 56 9.0 7.4 82 2214-1205 >90 MON APR 13 18 49 19 28 19 54 03 56 15 33 04 50 05 17 05 55 09 02 13 08 17 59 8.9 8.0 89 2302-0606 >90 TUE APR 14 18 50 19 28 19 55 04 32 16 29 04 50 05 16 05 55 09 07 13 12 18 03 8.9 8.6 96 2350 0019 >90 WED APR 15 18 50 19 29 19 55 05 10 17 26 04 49 05 15 05 54 09 11 13 16 18 06 8.9 8.9 100 0039 0652 >90 THU APR 16 18 50 19 29 19 56 05 52 18 27 04 48 05 14 05 53 09 16 13 20 18 09 8.9 8.9 100 0132 1313 >90 FRI APR 17 18 51 19 29 19 56 06 38 19 32 04 47 05 14 05 52 09 20 13 24 18 12 8.9 8.9 100 0228 1855 >90 SAT APR 18 18 51 19 30 19 56 20 40 04 46 05 13 05 51 09 23 13 28 18 15 8.8 8.1 91 0328 2331 >90 SUN APR 19 18 51 19 30 19 57 21 49 04 45 05 12 05 51 09 28 13 32 18 18 8.8 6.9 78 0432 2633 >90 MON APR 20 18 52 19 30 19 57 22 57 04 44 05 11 05 50 09 32 13 36 18 21 8.8 5.8 65 0537 2743 >90 TUE APR 21 18 52 19 31 19 58 23 59 04 43 05 10 05 49 09 37 13 40 18 24 8.7 4.7 54 0642 2656 >90 WED APR 22 18 52 19 31 19 58 00 54 04 42 05 09 05 49 09 41 13 44 18 27 8.7 3.8 43 0744 2421 82 THU APR 23 18 53 19 32 19 59 01 41 04 42 05 09 05 48 09 46 13 48 18 31 8.7 3.0 34 0842 2023 71 FRI APR 24 18 53 19 32 19 59 02 23 04 41 05 08 05 47 09 50 13 52 18 34 8.7 2.3 26 0935 1523 61 SAT APR 25 18 53 19 32 20 00 03 00 04 40 05 07 05 46 09 55 13 56 18 37 8.7 1.7 19 1024 0943 52 SUN APR 26 18 54 19 33 20 00 14 39 03 34 04 39 05 06 05 46 09 59 14 00 18 39 8.7 1.1 12 1111 0342 44 MON APR 27 18 54 19 33 20 01 15 31 04 07 04 38 05 06 05 45 10 04 14 04 18 42 8.6 0.5 5 1157-0223 38 TUE APR 28 18 54 19 34 20 01 16 21 04 40 04 37 05 05 05 44 10 08 14 08 18 45 8.6 0.0 0 1242-0819 35 WED APR 29 18 55 19 34 20 02 17 12 05 14 04 37 05 04 05 44 10 13 14 12 18 49 8.6 0.0 0 1328-1351 35 THU APR 30 18 55 19 35 20 02 18 04 05 51 04 36 05 03 05 43 10 17 14 15 18 52 8.6 0.0 0 1415-1848 39 ONE LINE REFERS TO EVENING DATE FULL MOON Apr 02 02:13 UT AND FOLLOWING MORNING. LAST QUARTER Apr 10 04:52 UT All dates and times are zone HST NEW MOON Apr 17 11:51 UT in upper table (except sid time). FIRST QUARTER Apr 24 02:32 UT