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 SAT AUG 01 19 10 19 50 20 19 21 00 04 38 05 06 05 47 16 41 20 22 01 01 8.3 0.7 8 2338-0038 52 SUN AUG 02 19 09 19 50 20 18 21 34 04 39 05 07 05 47 16 43 20 26 01 06 8.4 1.3 15 0025 0533 60 MON AUG 03 19 09 19 49 20 17 22 10 04 39 05 07 05 48 16 46 20 30 01 10 8.4 1.9 22 0113 1133 68 TUE AUG 04 19 08 19 48 20 17 22 49 04 40 05 08 05 48 16 50 20 34 01 15 8.4 2.5 30 0205 1705 78 WED AUG 05 19 07 19 48 20 16 23 33 04 40 05 08 05 48 16 53 20 38 01 19 8.4 3.3 39 0259 2144 88 THU AUG 06 19 07 19 47 20 15 00 24 04 41 05 09 05 49 16 56 20 42 01 24 8.4 4.2 49 0400 2521 >90 FRI AUG 07 19 06 19 46 20 14 01 23 14 44 04 41 05 09 05 49 16 59 20 46 01 28 8.4 5.1 60 0503 2716 >90 SAT AUG 08 19 06 19 46 20 14 02 28 15 50 04 42 05 09 05 50 17 03 20 50 01 33 8.5 6.2 73 0609 2719 >90 SUN AUG 09 19 05 19 45 20 13 03 36 16 52 04 42 05 10 05 50 17 06 20 54 01 36 8.5 7.4 87 0713 2527 >90 MON AUG 10 19 05 19 44 20 12 04 45 17 48 04 43 05 10 05 50 17 09 20 58 01 41 8.5 8.5 100 0815 2151 >90 TUE AUG 11 19 04 19 44 20 11 05 50 18 37 04 43 05 11 05 51 17 12 21 02 01 45 8.5 8.5 100 0913 1654 >90 WED AUG 12 19 03 19 43 20 11 06 52 19 20 04 44 05 11 05 51 17 16 21 06 01 50 8.6 8.6 100 1007 1104 >90 THU AUG 13 19 03 19 42 20 10 19 59 04 44 05 12 05 51 17 19 21 09 01 54 8.6 8.6 100 1057 0447 >90 FRI AUG 14 19 02 19 41 20 09 20 36 04 44 05 12 05 51 17 22 21 13 01 58 8.6 8.1 94 1145-0136 >90 SAT AUG 15 19 01 19 41 20 08 21 11 04 45 05 12 05 52 17 25 21 17 02 03 8.6 7.6 87 1232-0744 >90 SUN AUG 16 19 01 19 40 20 07 21 47 04 45 05 13 05 52 17 28 21 21 02 07 8.6 7.0 80 1318-1325 >90 MON AUG 17 19 00 19 39 20 06 22 24 04 46 05 13 05 52 17 31 21 25 02 12 8.7 6.4 73 1406-1825 >90 TUE AUG 18 18 59 19 38 20 06 23 04 04 46 05 13 05 53 17 35 21 29 02 16 8.7 5.7 65 1455-2235 >90 WED AUG 19 18 58 19 37 20 05 23 47 04 47 05 14 05 53 17 37 21 33 02 21 8.7 5.0 57 1546-2546 >90 THU AUG 20 18 58 19 37 20 04 00 33 04 47 05 14 05 53 17 40 21 37 02 25 8.7 4.2 48 1639-2743 87 FRI AUG 21 18 57 19 36 20 03 14 07 01 24 04 48 05 15 05 54 17 43 21 41 02 30 8.8 3.4 38 1732-2833 77 SAT AUG 22 18 56 19 35 20 02 14 58 02 16 04 48 05 15 05 54 17 46 21 45 02 34 8.8 2.5 28 1826-2806 68 SUN AUG 23 18 55 19 34 20 01 15 46 03 11 04 48 05 15 05 54 17 49 21 49 02 38 8.8 1.6 18 1919-2616 59 MON AUG 24 18 54 19 33 20 00 16 31 04 05 04 49 05 16 05 54 17 52 21 53 02 43 8.8 0.7 8 2012-2312 50 TUE AUG 25 18 54 19 32 19 59 17 12 04 59 04 49 05 16 05 55 17 55 21 57 02 47 8.8 0.0 0 2102-1904 41 WED AUG 26 18 53 19 32 19 58 17 50 05 52 04 49 05 16 05 55 17 58 22 01 02 50 8.8 0.0 0 2150-1403 34 THU AUG 27 18 52 19 31 19 57 18 26 06 45 04 50 05 16 05 55 18 01 22 05 02 55 8.9 0.0 0 2238-0821 29 FRI AUG 28 18 51 19 30 19 56 19 01 04 50 05 17 05 55 18 04 22 09 02 59 8.9 0.0 0 2325-0214 29 SAT AUG 29 18 50 19 29 19 55 19 35 04 51 05 17 05 56 18 07 22 13 03 04 8.9 0.0 0 0012 0404 33 SUN AUG 30 18 50 19 28 19 54 20 11 04 51 05 17 05 56 18 10 22 16 03 08 9.0 0.3 3 0101 1016 41 MON AUG 31 18 49 19 27 19 53 20 49 04 51 05 18 05 56 18 13 22 20 03 12 9.0 0.9 10 0152 1601 50 ONE LINE REFERS TO EVENING DATE LAST QUARTER Aug 06 02:21 UT AND FOLLOWING MORNING. NEW MOON Aug 12 17:36 UT All dates and times are zone HST FIRST QUARTER Aug 20 02:47 UT in upper table (except sid time). FULL MOON Aug 28 04:18 UT