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 SAT FEB 01 18 24 19 03 19 29 03 27 05 42 06 08 06 47 03 56 08 28 14 11 10.2 2.2 22 0501 2139 48 SUN FEB 02 18 25 19 04 19 30 14 21 04 14 05 41 06 08 06 46 04 01 08 32 14 14 10.2 1.5 14 0553 2120 37 MON FEB 03 18 25 19 04 19 30 15 11 04 59 05 41 06 07 06 46 04 05 08 36 14 18 10.2 0.7 6 0644 2001 26 TUE FEB 04 18 26 19 05 19 31 16 02 05 42 05 41 06 07 06 46 04 10 08 40 14 21 10.2 0.0 0 0734 1748 16 WED FEB 05 18 26 19 05 19 31 16 53 06 23 05 41 06 07 06 45 04 14 08 43 14 25 10.2 0.0 0 0824 1445 07 THU FEB 06 18 27 19 06 19 32 17 45 05 40 06 06 06 45 04 19 08 47 14 28 10.1 0.0 0 0913 1100 11 FRI FEB 07 18 27 19 06 19 32 18 37 05 40 06 06 06 45 04 23 08 51 14 32 10.1 0.0 0 1001 0643 21 SAT FEB 08 18 28 19 07 19 32 19 29 05 40 06 06 06 44 04 27 08 55 14 36 10.1 0.0 0 1049 0204 33 SUN FEB 09 18 28 19 07 19 33 20 22 05 39 06 05 06 44 04 32 08 59 14 39 10.1 0.8 8 1137-0244 45 MON FEB 10 18 29 19 07 19 33 21 15 05 39 06 05 06 43 04 35 09 03 14 43 10.1 1.7 16 1227-0728 57 TUE FEB 11 18 29 19 08 19 34 22 10 05 39 06 04 06 43 04 40 09 07 14 47 10.1 2.6 25 1318-1156 69 WED FEB 12 18 30 19 08 19 34 23 07 05 38 06 04 06 42 04 44 09 11 14 50 10.1 3.5 35 1411-1546 82 THU FEB 13 18 30 19 09 19 35 00 06 05 38 06 04 06 42 04 49 09 15 14 54 10.0 4.5 44 1507-1855 >90 FRI FEB 14 18 31 19 09 19 35 01 06 05 37 06 03 06 41 04 53 09 19 14 57 10.0 5.5 54 1605-2058 >90 SAT FEB 15 18 31 19 10 19 35 02 07 05 37 06 03 06 41 04 57 09 23 15 01 10.0 6.5 65 1706-2145 >90 SUN FEB 16 18 32 19 10 19 36 03 06 05 36 06 02 06 40 05 02 09 27 15 04 10.0 7.5 74 1807-2110 >90 MON FEB 17 18 32 19 10 19 36 04 02 14 52 05 36 06 01 06 40 05 06 09 31 15 08 10.0 8.4 84 1908-1914 >90 TUE FEB 18 18 33 19 11 19 36 04 55 15 56 05 35 06 01 06 39 05 10 09 35 15 11 10.0 9.3 93 2007-1605 >90 WED FEB 19 18 33 19 11 19 37 05 43 16 59 05 35 06 00 06 38 05 15 09 39 15 15 10.0 10.0 100 2104-1158 >90 THU FEB 20 18 33 19 11 19 37 06 28 18 00 05 34 06 00 06 38 05 19 09 43 15 18 9.9 9.9 100 2158-0714 >90 FRI FEB 21 18 34 19 12 19 38 19 00 05 34 05 59 06 37 05 24 09 47 15 21 9.9 9.9 100 2251-0212 >90 SAT FEB 22 18 34 19 12 19 38 19 58 05 33 05 59 06 36 05 28 09 50 15 24 9.9 9.6 96 2342 0249 >90 SUN FEB 23 18 35 19 13 19 38 20 54 05 32 05 58 06 36 05 32 09 54 15 27 9.9 8.6 87 0032 0734 >90 MON FEB 24 18 35 19 13 19 39 21 49 05 32 05 57 06 35 05 37 09 58 15 31 9.9 7.7 78 0122 1149 >90 TUE FEB 25 18 35 19 13 19 39 22 44 05 31 05 57 06 34 05 41 10 02 15 34 9.9 6.8 68 0212 1525 >90 WED FEB 26 18 36 19 14 19 39 23 37 05 30 05 56 06 34 05 45 10 06 15 37 9.9 5.9 59 0303 1814 >90 THU FEB 27 18 36 19 14 19 40 00 29 05 30 05 55 06 33 05 49 10 10 15 41 9.8 5.0 51 0354 2004 87 FRI FEB 28 18 37 19 14 19 40 01 19 05 29 05 55 06 32 05 53 10 14 15 44 9.8 4.2 42 0445 2108 76 ONE LINE REFERS TO EVENING DATE FULL MOON Feb 07 12:47 UT AND FOLLOWING MORNING. LAST QUARTER Feb 14 22:50 UT All dates and times are zone HST NEW MOON Feb 21 15:48 UT