KECK OBSERVATORY CALENDAR FOR 2031 -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 2031 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 SEP 01 18 48 19 26 19 53 18 46 04 52 05 18 05 56 18 16 22 24 03 16 9.0 0.0 0 2331 0108 25 TUE SEP 02 18 47 19 25 19 52 19 29 04 52 05 18 05 57 18 19 22 27 03 20 9.0 0.0 0 0025 0607 32 WED SEP 03 18 46 19 24 19 51 20 13 04 52 05 19 05 57 18 22 22 31 03 24 9.0 0.4 4 0119 1037 41 THU SEP 04 18 45 19 23 19 50 20 56 04 53 05 19 05 57 18 25 22 35 03 29 9.0 1.1 12 0212 1422 52 FRI SEP 05 18 44 19 22 19 49 21 41 04 53 05 19 05 57 18 28 22 39 03 33 9.1 1.9 20 0305 1716 63 SAT SEP 06 18 43 19 21 19 48 22 28 04 53 05 19 05 57 18 31 22 43 03 37 9.1 2.7 29 0357 1912 73 SUN SEP 07 18 43 19 21 19 47 23 16 04 54 05 20 05 58 18 33 22 47 03 42 9.1 3.5 38 0449 2008 84 MON SEP 08 18 42 19 20 19 46 00 05 04 54 05 20 05 58 18 36 22 51 03 46 9.1 4.3 47 0541 2010 >90 TUE SEP 09 18 41 19 19 19 45 00 54 04 54 05 20 05 58 18 39 22 55 03 50 9.2 5.1 56 0631 1915 >90 WED SEP 10 18 40 19 18 19 44 01 44 14 39 04 54 05 20 05 58 18 42 22 59 03 54 9.2 6.0 65 0720 1730 >90 THU SEP 11 18 39 19 17 19 43 02 35 15 21 04 55 05 21 05 59 18 45 23 03 03 59 9.2 6.9 74 0808 1459 >90 FRI SEP 12 18 38 19 16 19 42 03 25 16 01 04 55 05 21 05 59 18 48 23 07 04 03 9.2 7.7 83 0855 1151 >90 SAT SEP 13 18 37 19 15 19 41 04 15 16 40 04 55 05 21 05 59 18 51 23 11 04 07 9.2 8.6 92 0941 0812 >90 SUN SEP 14 18 36 19 14 19 40 05 05 17 17 04 56 05 21 05 59 18 54 23 15 04 12 9.3 9.3 100 1027 0410 >90 MON SEP 15 18 35 19 13 19 39 05 56 17 54 04 56 05 22 05 59 18 57 23 19 04 16 9.3 9.3 100 1113-0006 >90 TUE SEP 16 18 34 19 12 19 38 06 48 18 32 04 56 05 22 06 00 19 00 23 23 04 19 9.3 9.3 100 1200-0427 >90 WED SEP 17 18 33 19 11 19 37 19 11 04 56 05 22 06 00 19 03 23 27 04 23 9.3 9.3 100 1248-0841 >90 THU SEP 18 18 32 19 10 19 36 19 53 04 57 05 22 06 00 19 06 23 31 04 28 9.3 9.1 96 1338-1237 >90 FRI SEP 19 18 32 19 09 19 35 20 38 04 57 05 23 06 00 19 09 23 34 04 32 9.4 8.3 88 1430-1601 >90 SAT SEP 20 18 31 19 08 19 34 21 27 04 57 05 23 06 00 19 12 23 38 04 36 9.4 7.5 79 1525-1838 >90 SUN SEP 21 18 30 19 07 19 33 22 19 04 57 05 23 06 01 19 15 23 42 04 40 9.4 6.6 70 1623-2016 >90 MON SEP 22 18 29 19 06 19 32 23 16 04 58 05 23 06 01 19 18 23 46 04 45 9.4 5.7 60 1721-2045 >90 TUE SEP 23 18 28 19 05 19 31 00 15 04 58 05 23 06 01 19 21 23 50 04 49 9.5 4.7 49 1823-1946 90 WED SEP 24 18 27 19 05 19 30 01 17 04 58 05 24 06 01 19 23 23 54 04 53 9.5 3.7 38 1921-1754 77 THU SEP 25 18 26 19 04 19 29 14 16 02 18 04 58 05 24 06 01 19 26 23 58 04 57 9.5 2.7 28 2020-1447 64 FRI SEP 26 18 25 19 03 19 28 15 05 03 19 04 59 05 24 06 02 19 29 00 02 05 02 9.5 1.7 17 2117-1042 51 SAT SEP 27 18 24 19 02 19 27 15 52 04 20 04 59 05 24 06 02 19 32 00 06 05 06 9.5 0.7 6 2213-0559 38 SUN SEP 28 18 23 19 01 19 26 16 37 05 19 04 59 05 25 06 02 19 35 00 10 05 10 9.6 0.0 0 2308-0057 26 MON SEP 29 18 23 19 00 19 26 17 20 06 18 04 59 05 25 06 02 19 39 00 14 05 14 9.6 0.0 0 0002 0405 16 TUE SEP 30 18 22 18 59 19 25 18 04 05 00 05 25 06 03 19 42 00 18 05 19 9.6 0.0 0 0055 0847 14 ONE LINE REFERS TO EVENING DATE FULL MOON Sep 01 09:21 UT AND FOLLOWING MORNING. LAST QUARTER Sep 08 16:16 UT All dates and times are zone HST NEW MOON Sep 16 18:47 UT in upper table (except sid time). FIRST QUARTER Sep 24 01:20 UT FULL MOON Sep 30 18:59 UT