KECK OBSERVATORY CALENDAR FOR 2023 -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 2023 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 SEP 01 18 48 19 26 19 53 20 04 04 52 05 18 05 56 18 16 22 23 03 16 9.0 0.2 2 0051 0337 39 SAT SEP 02 18 47 19 25 19 52 20 43 04 52 05 18 05 57 18 19 22 27 03 20 9.0 0.9 9 0143 1018 48 SUN SEP 03 18 46 19 24 19 51 21 22 04 52 05 19 05 57 18 21 22 31 03 24 9.0 1.5 16 0236 1613 58 MON SEP 04 18 45 19 23 19 50 22 04 04 53 05 19 05 57 18 24 22 35 03 29 9.0 2.2 24 0329 2105 68 TUE SEP 05 18 44 19 22 19 49 22 49 04 53 05 19 05 57 18 27 22 39 03 33 9.1 3.0 33 0424 2441 79 WED SEP 06 18 43 19 21 19 48 23 38 04 53 05 19 05 57 18 30 22 43 03 37 9.1 3.8 42 0518 2647 89 THU SEP 07 18 43 19 21 19 47 00 30 04 54 05 20 05 58 18 33 22 47 03 42 9.1 4.7 51 0615 2744 >90 FRI SEP 08 18 42 19 20 19 46 01 24 14 51 04 54 05 20 05 58 18 36 22 51 03 46 9.1 5.6 61 0710 2709 >90 SAT SEP 09 18 41 19 19 19 45 02 18 15 40 04 54 05 20 05 58 18 39 22 55 03 50 9.2 6.5 71 0802 2519 >90 SUN SEP 10 18 40 19 18 19 44 03 12 16 24 04 54 05 20 05 58 18 42 22 59 03 54 9.2 7.5 81 0852 2223 >90 MON SEP 11 18 39 19 17 19 43 04 04 17 03 04 55 05 21 05 59 18 45 23 03 03 59 9.2 8.3 90 0939 1833 >90 TUE SEP 12 18 38 19 16 19 42 04 55 17 39 04 55 05 21 05 59 18 48 23 07 04 02 9.2 9.2 100 1024 1400 >90 WED SEP 13 18 37 19 15 19 41 05 44 18 12 04 55 05 21 05 59 18 51 23 11 04 06 9.2 9.2 100 1107 0855 >90 THU SEP 14 18 36 19 14 19 40 06 32 18 43 04 56 05 21 05 59 18 54 23 15 04 11 9.3 9.3 100 1149 0329 >90 FRI SEP 15 18 35 19 13 19 39 19 14 04 56 05 22 05 59 18 57 23 18 04 15 9.3 9.3 100 1231-0207 >90 SAT SEP 16 18 34 19 12 19 38 19 46 04 56 05 22 06 00 19 00 23 22 04 19 9.3 9.2 98 1314-0744 >90 SUN SEP 17 18 33 19 11 19 37 20 19 04 56 05 22 06 00 19 03 23 26 04 23 9.3 8.6 92 1358-1310 >90 MON SEP 18 18 32 19 10 19 36 20 56 04 57 05 22 06 00 19 06 23 30 04 28 9.3 8.0 85 1445-1812 >90 TUE SEP 19 18 32 19 09 19 35 21 36 04 57 05 23 06 00 19 09 23 34 04 32 9.4 7.3 78 1536-2233 >90 WED SEP 20 18 31 19 08 19 34 22 23 04 57 05 23 06 00 19 11 23 38 04 36 9.4 6.6 69 1631-2557 >90 THU SEP 21 18 30 19 07 19 33 23 16 04 57 05 23 06 01 19 14 23 42 04 40 9.4 5.7 60 1729-2804 >90 FRI SEP 22 18 29 19 06 19 32 00 16 04 58 05 23 06 01 19 17 23 46 04 45 9.4 4.7 49 1834-2821 90 SAT SEP 23 18 28 19 05 19 31 01 20 04 58 05 23 06 01 19 20 23 50 04 49 9.5 3.6 38 1935-2715 78 SUN SEP 24 18 27 19 05 19 30 14 53 02 27 04 58 05 24 06 01 19 23 23 54 04 53 9.5 2.5 26 2038-2413 65 MON SEP 25 18 26 19 04 19 29 15 44 03 33 04 58 05 24 06 01 19 26 23 58 04 57 9.5 1.4 14 2138-1929 52 TUE SEP 26 18 25 19 03 19 28 16 31 04 37 04 59 05 24 06 02 19 29 00 02 05 02 9.5 0.4 3 2236-1330 39 WED SEP 27 18 24 19 02 19 27 17 14 05 40 04 59 05 24 06 02 19 32 00 06 05 06 9.5 0.0 0 2331-0641 28 THU SEP 28 18 23 19 01 19 26 17 54 06 42 04 59 05 25 06 02 19 35 00 10 05 10 9.6 0.0 0 0025 0029 20 FRI SEP 29 18 23 19 00 19 26 18 34 04 59 05 25 06 02 19 39 00 14 05 13 9.6 0.0 0 0118 0731 20 SAT SEP 30 18 22 18 59 19 25 19 14 05 00 05 25 06 03 19 42 00 18 05 18 9.6 0.0 0 0212 1359 28 ONE LINE REFERS TO EVENING DATE LAST QUARTER Sep 06 22:20 UT AND FOLLOWING MORNING. NEW MOON Sep 15 01:41 UT All dates and times are zone HST FIRST QUARTER Sep 22 19:31 UT in upper table (except sid time). FULL MOON Sep 29 09:59 UT