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 MON JUN 01 19 08 19 50 20 20 20 23 04 19 04 49 05 31 12 41 16 22 20 41 8.0 0.0 0 1821-2820 56 TUE JUN 02 19 08 19 51 20 20 21 11 04 19 04 49 05 31 12 45 16 26 20 45 8.0 0.8 10 1915-2643 62 WED JUN 03 19 09 19 51 20 21 21 55 04 19 04 49 05 31 12 50 16 30 20 49 8.0 1.6 19 2006-2354 69 THU JUN 04 19 09 19 51 20 21 22 36 04 19 04 49 05 31 12 54 16 33 20 53 8.0 2.2 28 2056-1959 76 FRI JUN 05 19 10 19 52 20 22 23 14 04 19 04 49 05 31 12 59 16 37 20 57 7.9 2.9 36 2143-1515 83 SAT JUN 06 19 10 19 52 20 22 23 49 04 19 04 49 05 31 13 03 16 41 21 01 7.9 3.5 43 2227-0939 >90 SUN JUN 07 19 10 19 53 20 23 00 23 04 19 04 49 05 31 13 08 16 45 21 05 7.9 4.0 50 2316-0402 >90 MON JUN 08 19 11 19 53 20 23 00 58 04 19 04 49 05 31 13 12 16 49 21 09 7.9 4.6 57 2402 0209 >90 TUE JUN 09 19 11 19 53 20 23 01 34 04 19 04 49 05 31 13 16 16 53 21 13 7.9 5.2 65 0051 0823 >90 WED JUN 10 19 11 19 54 20 24 02 15 14 52 04 19 04 49 05 31 13 21 16 57 21 17 7.9 5.9 73 0143 1423 >90 THU JUN 11 19 12 19 54 20 24 03 00 15 54 04 19 04 49 05 31 13 24 17 01 21 21 7.9 6.6 83 0239 1944 >90 FRI JUN 12 19 12 19 55 20 25 03 53 17 02 04 19 04 49 05 31 13 29 17 05 21 25 7.9 7.5 94 0340 2359 >90 SAT JUN 13 19 12 19 55 20 25 04 54 18 12 04 19 04 49 05 31 13 33 17 09 21 29 7.9 7.9 100 0445 2637 >90 SUN JUN 14 19 13 19 55 20 25 06 02 19 23 04 19 04 49 05 31 13 37 17 13 21 33 7.9 7.9 100 0553 2716 >90 MON JUN 15 19 13 19 56 20 26 20 28 04 19 04 49 05 32 13 42 17 17 21 37 7.9 7.8 99 0700 2551 >90 TUE JUN 16 19 13 19 56 20 26 21 25 04 19 04 49 05 32 13 46 17 21 21 40 7.9 6.9 87 0803 2236 >90 WED JUN 17 19 13 19 56 20 26 22 14 04 19 04 49 05 32 13 50 17 25 21 44 7.9 6.1 77 0902 1756 >90 THU JUN 18 19 14 19 56 20 27 22 56 04 19 04 49 05 32 13 55 17 29 21 48 7.9 5.4 68 0955 1223 >90 FRI JUN 19 19 14 19 57 20 27 23 34 04 19 04 50 05 32 13 59 17 33 21 52 7.9 4.7 60 1045 0622 >90 SAT JUN 20 19 14 19 57 20 27 00 09 04 20 04 50 05 32 14 03 17 37 21 57 7.9 4.2 53 1135-0004 >90 SUN JUN 21 19 14 19 57 20 27 00 42 04 20 04 50 05 33 14 07 17 40 22 01 7.9 3.6 46 1218-0544 83 MON JUN 22 19 15 19 57 20 28 01 16 04 20 04 50 05 33 14 12 17 44 22 05 7.9 3.1 38 1303-1125 76 TUE JUN 23 19 15 19 58 20 28 01 52 04 20 04 50 05 33 14 16 17 48 22 09 7.9 2.5 31 1349-1637 69 WED JUN 24 19 15 19 58 20 28 14 48 02 30 04 21 04 51 05 33 14 20 17 52 22 14 7.9 1.8 23 1436-2105 63 THU JUN 25 19 15 19 58 20 28 15 40 03 11 04 21 04 51 05 34 14 24 17 56 22 18 7.9 1.2 14 1526-2441 58 FRI JUN 26 19 15 19 58 20 28 16 33 03 56 04 21 04 51 05 34 14 28 18 00 22 22 7.9 0.4 5 1618-2714 53 SAT JUN 27 19 16 19 58 20 28 17 27 04 45 04 21 04 52 05 34 14 32 18 04 22 26 7.9 0.0 0 1711-2833 50 SUN JUN 28 19 16 19 58 20 28 18 19 05 37 04 22 04 52 05 35 14 36 18 08 22 31 7.9 0.0 0 1806-2834 48 MON JUN 29 19 16 19 58 20 28 19 08 06 30 04 22 04 52 05 35 14 39 18 12 22 35 7.9 0.0 0 1900-2715 48 TUE JUN 30 19 16 19 58 20 29 19 54 04 22 04 53 05 35 14 44 18 16 22 39 7.9 0.0 0 1952-2441 50 ONE LINE REFERS TO EVENING DATE LAST QUARTER Jun 08 10:02 UT AND FOLLOWING MORNING. NEW MOON Jun 15 02:54 UT All dates and times are zone HST FIRST QUARTER Jun 21 21:56 UT in upper table (except sid time). FULL MOON Jun 29 23:59 UT