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 FRI MAY 01 18 55 19 35 20 03 18 56 06 31 04 35 05 03 05 42 10 22 14 19 18 55 8.5 0.0 0 1504-2257 44 SAT MAY 02 18 56 19 36 20 03 19 50 04 34 05 02 05 42 10 26 14 23 18 58 8.5 0.0 0 1555-2605 51 SUN MAY 03 18 56 19 36 20 04 20 44 04 34 05 01 05 41 10 31 14 27 19 02 8.5 0.7 7 1648-2802 59 MON MAY 04 18 56 19 36 20 04 21 36 04 33 05 01 05 41 10 35 14 31 19 05 8.5 1.5 18 1743-2843 67 TUE MAY 05 18 57 19 37 20 05 22 27 04 32 05 00 05 40 10 40 14 35 19 08 8.4 2.4 28 1836-2800 75 WED MAY 06 18 57 19 37 20 05 23 14 04 31 04 59 05 40 10 43 14 39 19 11 8.4 3.1 37 1929-2603 84 THU MAY 07 18 58 19 38 20 06 23 57 04 31 04 59 05 39 10 48 14 43 19 15 8.4 3.9 45 2014-2230 >90 FRI MAY 08 18 58 19 38 20 06 00 38 04 30 04 58 05 39 10 52 14 47 19 18 8.4 4.5 53 2110-1855 >90 SAT MAY 09 18 58 19 39 20 07 01 15 04 29 04 58 05 38 10 57 14 51 19 21 8.4 5.1 61 2157-1358 >90 SUN MAY 10 18 59 19 39 20 08 01 51 04 29 04 57 05 38 11 02 14 55 19 25 8.3 5.7 68 2244-0819 >90 MON MAY 11 18 59 19 40 20 08 02 26 14 15 04 28 04 57 05 37 11 06 14 59 19 28 8.3 6.3 75 2331-0211 >90 TUE MAY 12 19 00 19 40 20 09 03 03 15 10 04 28 04 56 05 37 11 11 15 03 19 32 8.3 6.9 82 0019 0413 >90 WED MAY 13 19 00 19 41 20 09 03 42 16 08 04 27 04 55 05 36 11 15 15 07 19 34 8.3 7.6 90 0110 1036 >90 THU MAY 14 19 00 19 41 20 10 04 25 17 10 04 26 04 55 05 36 11 20 15 11 19 37 8.3 8.3 99 0204 1634 >90 FRI MAY 15 19 01 19 42 20 10 05 15 18 17 04 26 04 55 05 35 11 24 15 15 19 41 8.3 8.3 100 0303 2139 >90 SAT MAY 16 19 01 19 42 20 11 06 12 19 27 04 25 04 54 05 35 11 29 15 19 19 44 8.2 8.2 100 0407 2521 >90 SUN MAY 17 19 02 19 43 20 12 20 38 04 25 04 54 05 35 11 34 15 22 19 48 8.2 7.8 94 0513 2714 >90 MON MAY 18 19 02 19 43 20 12 21 45 04 24 04 53 05 34 11 38 15 26 19 51 8.2 6.7 81 0620 2706 >90 TUE MAY 19 19 03 19 44 20 13 22 45 04 24 04 53 05 34 11 43 15 30 19 55 8.2 5.7 69 0725 2500 >90 WED MAY 20 19 03 19 44 20 13 23 37 04 23 04 52 05 34 11 47 15 34 19 58 8.2 4.8 58 0825 2117 >90 THU MAY 21 19 03 19 45 20 14 00 21 04 23 04 52 05 33 11 52 15 38 20 02 8.1 4.0 49 0922 1618 88 FRI MAY 22 19 04 19 45 20 14 01 00 04 23 04 52 05 33 11 56 15 42 20 06 8.1 3.4 41 1012 1048 80 SAT MAY 23 19 04 19 46 20 15 01 35 04 22 04 51 05 33 12 01 15 46 20 09 8.1 2.8 34 1059 0451 71 SUN MAY 24 19 05 19 46 20 15 02 09 04 22 04 51 05 33 12 04 15 50 20 13 8.1 2.2 27 1145-0111 64 MON MAY 25 19 05 19 47 20 16 14 18 02 42 04 21 04 51 05 32 12 09 15 54 20 16 8.1 1.6 20 1230-0705 57 TUE MAY 26 19 06 19 47 20 17 15 09 03 15 04 21 04 50 05 32 12 14 15 58 20 20 8.1 1.1 13 1315-1239 52 WED MAY 27 19 06 19 48 20 17 16 00 03 51 04 21 04 50 05 32 12 18 16 02 20 24 8.1 0.5 6 1401-1742 48 THU MAY 28 19 06 19 48 20 18 16 52 04 30 04 20 04 50 05 32 12 23 16 06 20 27 8.0 0.0 0 1450-2200 46 FRI MAY 29 19 07 19 49 20 18 17 44 05 12 04 20 04 50 05 32 12 27 16 10 20 31 8.0 0.0 0 1540-2523 46 SAT MAY 30 19 07 19 49 20 19 18 38 05 59 04 20 04 50 05 31 12 32 16 14 20 34 8.0 0.0 0 1633-2739 48 SUN MAY 31 19 08 19 50 20 19 19 31 06 49 04 20 04 49 05 31 12 36 16 18 20 38 8.0 0.0 0 1727-2840 51 ONE LINE REFERS TO EVENING DATE FULL MOON May 01 17:23 UT AND FOLLOWING MORNING. LAST QUARTER May 09 21:12 UT All dates and times are zone HST NEW MOON May 16 20:01 UT in upper table (except sid time). FIRST QUARTER May 23 11:11 UT FULL MOON May 31 08:46 UT