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 TUE SEP 01 18 48 19 26 19 53 21 32 04 52 05 18 05 56 18 17 22 24 03 17 9.0 1.6 18 0247 2100 61 WED SEP 02 18 47 19 25 19 52 22 20 04 52 05 18 05 57 18 20 22 28 03 21 9.0 2.5 27 0345 2449 73 THU SEP 03 18 46 19 24 19 51 23 15 04 52 05 19 05 57 18 23 22 32 03 25 9.0 3.4 37 0447 2705 84 FRI SEP 04 18 45 19 23 19 50 00 17 04 53 05 19 05 57 18 25 22 36 03 30 9.0 4.4 49 0552 2740 >90 SAT SEP 05 18 44 19 22 19 49 01 23 14 42 04 53 05 19 05 57 18 28 22 40 03 34 9.1 5.6 61 0655 2621 >90 SUN SEP 06 18 43 19 21 19 48 02 29 15 39 04 53 05 19 05 57 18 31 22 44 03 38 9.1 6.7 73 0757 2318 >90 MON SEP 07 18 43 19 21 19 47 03 34 16 29 04 54 05 20 05 58 18 34 22 48 03 43 9.1 7.8 85 0854 1851 >90 TUE SEP 08 18 42 19 20 19 46 04 36 17 14 04 54 05 20 05 58 18 37 22 52 03 47 9.1 8.8 96 0948 1322 >90 WED SEP 09 18 41 19 19 19 45 05 35 17 54 04 54 05 20 05 58 18 40 22 56 03 51 9.2 9.2 100 1039 0717 >90 THU SEP 10 18 40 19 18 19 44 06 31 18 31 04 54 05 20 05 58 18 43 23 00 03 55 9.2 9.2 100 1128 0057 >90 FRI SEP 11 18 39 19 17 19 43 19 07 04 55 05 21 05 59 18 46 23 04 04 00 9.2 9.2 100 1215-0519 >90 SAT SEP 12 18 38 19 16 19 42 19 43 04 55 05 21 05 59 18 49 23 08 04 04 9.2 9.2 99 1302-1113 >90 SUN SEP 13 18 37 19 15 19 41 20 20 04 55 05 21 05 59 18 52 23 12 04 07 9.2 8.6 92 1349-1631 >90 MON SEP 14 18 36 19 14 19 40 20 59 04 56 05 21 05 59 18 55 23 16 04 12 9.3 7.9 85 1438-2102 >90 TUE SEP 15 18 35 19 13 19 39 21 41 04 56 05 22 05 59 18 58 23 20 04 16 9.3 7.3 78 1528-2435 >90 WED SEP 16 18 34 19 12 19 38 22 26 04 56 05 22 06 00 19 01 23 23 04 20 9.3 6.5 69 1620-2701 >90 THU SEP 17 18 33 19 11 19 37 23 15 04 56 05 22 06 00 19 04 23 27 04 24 9.3 5.7 61 1714-2813 >90 FRI SEP 18 18 32 19 10 19 36 00 07 04 57 05 22 06 00 19 07 23 31 04 29 9.3 4.8 51 1812-2742 >90 SAT SEP 19 18 32 19 09 19 35 01 00 04 57 05 23 06 00 19 10 23 35 04 33 9.4 3.9 42 1901-2644 81 SUN SEP 20 18 31 19 08 19 34 14 25 01 54 04 57 05 23 06 00 19 13 23 39 04 37 9.4 3.0 32 1953-2413 71 MON SEP 21 18 30 19 07 19 33 15 08 02 48 04 57 05 23 06 01 19 15 23 43 04 41 9.4 2.1 22 2043-2030 60 TUE SEP 22 18 29 19 06 19 32 15 47 03 42 04 58 05 23 06 01 19 18 23 47 04 46 9.4 1.3 13 2132-1549 49 WED SEP 23 18 28 19 05 19 31 16 23 04 35 04 58 05 23 06 01 19 21 23 51 04 50 9.5 0.4 4 2220-1022 38 THU SEP 24 18 27 19 05 19 30 16 59 05 28 04 58 05 24 06 01 19 24 23 55 04 54 9.5 0.0 0 2307-0420 27 FRI SEP 25 18 26 19 04 19 29 17 34 06 23 04 58 05 24 06 01 19 27 23 59 04 58 9.5 0.0 0 2355 0201 18 SAT SEP 26 18 25 19 03 19 28 18 10 04 59 05 24 06 02 19 30 00 03 05 03 9.5 0.0 0 0044 0824 15 SUN SEP 27 18 24 19 02 19 27 18 48 04 59 05 24 06 02 19 33 00 07 05 07 9.5 0.0 0 0136 1428 22 MON SEP 28 18 23 19 01 19 26 19 30 04 59 05 25 06 02 19 36 00 11 05 11 9.6 0.1 0 0231 1950 33 TUE SEP 29 18 23 19 00 19 26 20 17 04 59 05 25 06 02 19 40 00 15 05 15 9.6 0.9 8 0330 2405 45 WED SEP 30 18 22 18 59 19 25 21 11 05 00 05 25 06 03 19 43 00 19 05 20 9.6 1.8 18 0433 2650 58 ONE LINE REFERS TO EVENING DATE LAST QUARTER Sep 04 07:51 UT AND FOLLOWING MORNING. NEW MOON Sep 11 03:26 UT All dates and times are zone HST FIRST QUARTER Sep 18 20:44 UT in upper table (except sid time). FULL MOON Sep 26 16:47 UT