KECK OBSERVATORY CALENDAR FOR 2027 -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 2027 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 SEP 01 18 48 19 26 19 53 19 36 04 52 05 18 05 56 18 16 22 23 03 16 9.0 9.0 100 1203-0511 >90 THU SEP 02 18 47 19 25 19 52 20 16 04 52 05 18 05 57 18 19 22 27 03 20 9.0 8.6 95 1254-1123 >90 FRI SEP 03 18 46 19 24 19 51 20 57 04 52 05 19 05 57 18 22 22 31 03 24 9.0 7.9 87 1346-1653 >90 SAT SEP 04 18 45 19 23 19 50 21 41 04 53 05 19 05 57 18 25 22 35 03 29 9.0 7.2 79 1439-2123 >90 SUN SEP 05 18 44 19 22 19 49 22 28 04 53 05 19 05 57 18 27 22 39 03 33 9.1 6.4 70 1534-2444 >90 MON SEP 06 18 43 19 21 19 48 23 17 04 53 05 19 05 57 18 30 22 43 03 37 9.1 5.6 61 1629-2646 >90 TUE SEP 07 18 43 19 21 19 47 00 09 04 54 05 20 05 58 18 33 22 47 03 42 9.1 4.8 52 1728-2706 >90 WED SEP 08 18 42 19 20 19 46 01 02 04 54 05 20 05 58 18 36 22 51 03 46 9.1 3.9 42 1818-2649 81 THU SEP 09 18 41 19 19 19 45 14 28 01 56 04 54 05 20 05 58 18 39 22 55 03 50 9.2 3.0 32 1911-2502 71 FRI SEP 10 18 40 19 18 19 44 15 12 02 48 04 54 05 20 05 58 18 42 22 59 03 54 9.2 2.1 22 2001-2206 60 SAT SEP 11 18 39 19 17 19 43 15 52 03 39 04 55 05 21 05 59 18 45 23 03 03 59 9.2 1.3 13 2049-1815 50 SUN SEP 12 18 38 19 16 19 42 16 29 04 30 04 55 05 21 05 59 18 48 23 07 04 03 9.2 0.4 4 2136-1340 40 MON SEP 13 18 37 19 15 19 41 17 03 05 19 04 55 05 21 05 59 18 51 23 11 04 07 9.2 0.0 0 2220-0832 31 TUE SEP 14 18 36 19 14 19 40 17 35 06 08 04 56 05 21 05 59 18 54 23 15 04 11 9.3 0.0 0 2304-0303 23 WED SEP 15 18 35 19 13 19 39 18 08 06 57 04 56 05 22 05 59 18 57 23 19 04 15 9.3 0.0 0 2349 0236 19 THU SEP 16 18 34 19 12 19 38 18 41 04 56 05 22 06 00 19 00 23 23 04 19 9.3 0.0 0 0034 0813 21 FRI SEP 17 18 33 19 11 19 37 19 16 04 56 05 22 06 00 19 03 23 26 04 23 9.3 0.0 0 0121 1334 28 SAT SEP 18 18 32 19 10 19 36 19 54 04 57 05 22 06 00 19 06 23 30 04 28 9.3 0.3 3 0212 1823 38 SUN SEP 19 18 32 19 09 19 35 20 36 04 57 05 23 06 00 19 09 23 34 04 32 9.4 1.0 10 0305 2222 49 MON SEP 20 18 31 19 08 19 34 21 25 04 57 05 23 06 00 19 12 23 38 04 36 9.4 1.8 19 0402 2513 61 TUE SEP 21 18 30 19 07 19 33 22 19 04 57 05 23 06 01 19 15 23 42 04 40 9.4 2.8 29 0502 2638 73 WED SEP 22 18 29 19 06 19 32 23 19 04 58 05 23 06 01 19 17 23 46 04 45 9.4 3.8 40 0603 2624 85 THU SEP 23 18 28 19 05 19 31 00 23 04 58 05 23 06 01 19 20 23 50 04 49 9.5 4.9 51 0705 2434 >90 FRI SEP 24 18 27 19 05 19 30 01 29 14 31 04 58 05 24 06 01 19 23 23 54 04 53 9.5 6.0 63 0805 2107 >90 SAT SEP 25 18 26 19 04 19 29 02 33 15 20 04 58 05 24 06 01 19 26 23 58 04 57 9.5 7.1 74 0903 1620 >90 SUN SEP 26 18 25 19 03 19 28 03 37 16 05 04 59 05 24 06 02 19 29 00 02 05 02 9.5 8.1 85 0958 1034 >90 MON SEP 27 18 24 19 02 19 27 04 39 16 47 04 59 05 24 06 02 19 32 00 06 05 06 9.5 9.2 96 1050 0413 >90 TUE SEP 28 18 23 19 01 19 26 05 39 17 27 04 59 05 25 06 02 19 35 00 10 05 10 9.6 9.6 100 1142-0220 >90 WED SEP 29 18 23 19 00 19 26 06 39 18 07 04 59 05 25 06 02 19 39 00 14 05 14 9.6 9.6 100 1234-0842 >90 THU SEP 30 18 22 18 59 19 25 18 48 05 00 05 25 06 03 19 42 00 18 05 19 9.6 9.6 100 1326-1430 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Sep 07 18:31 UT AND FOLLOWING MORNING. FULL MOON Sep 15 23:04 UT All dates and times are zone HST LAST QUARTER Sep 23 10:20 UT in upper table (except sid time). NEW MOON Sep 30 02:36 UT