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 TUE APR 01 18 46 19 24 19 50 02 53 05 02 05 28 06 06 08 10 12 20 17 23 9.2 2.2 23 0837 1313 54 WED APR 02 18 46 19 24 19 50 14 19 03 32 05 01 05 27 06 05 08 14 12 24 17 26 9.2 1.5 16 0925 0926 45 THU APR 03 18 47 19 24 19 51 15 10 04 10 05 00 05 26 06 04 08 19 12 28 17 29 9.1 0.8 9 1013 0508 36 FRI APR 04 18 47 19 25 19 51 16 03 04 49 04 59 05 25 06 03 08 22 12 32 17 32 9.1 0.2 1 1102 0027 29 SAT APR 05 18 47 19 25 19 51 16 57 05 29 04 58 05 24 06 02 08 26 12 36 17 35 9.1 0.0 0 1152-0423 27 SUN APR 06 18 47 19 25 19 52 17 53 06 11 04 57 05 23 06 01 08 31 12 40 17 38 9.1 0.0 0 1244-0909 29 MON APR 07 18 48 19 26 19 52 18 50 06 57 04 56 05 22 06 00 08 35 12 44 17 41 9.1 0.0 0 1338-1333 36 TUE APR 08 18 48 19 26 19 52 19 50 04 55 05 21 06 00 08 39 12 48 17 44 9.0 0.0 0 1436-1715 46 WED APR 09 18 48 19 26 19 53 20 52 04 54 05 20 05 59 08 44 12 52 17 47 9.0 1.0 10 1535-1958 56 THU APR 10 18 48 19 27 19 53 21 54 04 53 05 20 05 58 08 48 12 56 17 50 9.0 2.0 22 1637-2125 68 FRI APR 11 18 49 19 27 19 53 22 54 04 52 05 19 05 57 08 52 13 00 17 53 9.0 3.0 33 1738-2126 80 SAT APR 12 18 49 19 27 19 54 23 51 04 51 05 18 05 56 08 57 13 04 17 55 9.0 4.0 44 1836-1949 >90 SUN APR 13 18 49 19 28 19 54 00 45 04 50 05 17 05 55 09 01 13 08 17 58 8.9 4.9 54 1939-1739 >90 MON APR 14 18 50 19 28 19 55 01 33 04 50 05 16 05 55 09 06 13 12 18 02 8.9 5.6 63 2035-1409 >90 TUE APR 15 18 50 19 29 19 55 02 19 04 49 05 15 05 54 09 10 13 16 18 05 8.9 6.4 71 2129-0957 >90 WED APR 16 18 50 19 29 19 56 03 01 14 39 04 48 05 14 05 53 09 15 13 19 18 08 8.9 7.1 79 2220-0519 >90 THU APR 17 18 51 19 29 19 56 03 42 15 35 04 47 05 14 05 52 09 19 13 23 18 11 8.9 7.8 87 2311-0030 >90 FRI APR 18 18 51 19 30 19 56 04 22 16 31 04 46 05 13 05 51 09 23 13 27 18 14 8.8 8.4 95 2400 0414 >90 SAT APR 19 18 51 19 30 19 57 05 03 17 26 04 45 05 12 05 51 09 28 13 31 18 17 8.8 8.8 100 0049 0840 >90 SUN APR 20 18 52 19 30 19 57 05 44 18 20 04 44 05 11 05 50 09 32 13 35 18 20 8.8 8.8 100 0139 1237 >90 MON APR 21 18 52 19 31 19 58 06 27 19 14 04 43 05 10 05 49 09 36 13 39 18 23 8.7 8.7 100 0229 1554 >90 TUE APR 22 18 52 19 31 19 58 20 08 04 42 05 09 05 49 09 40 13 43 18 26 8.7 8.6 98 0320 1823 >90 WED APR 23 18 53 19 32 19 59 21 01 04 42 05 09 05 48 09 45 13 47 18 30 8.7 7.7 88 0411 1958 >90 THU APR 24 18 53 19 32 19 59 21 52 04 41 05 08 05 47 09 49 13 51 18 33 8.7 6.8 78 0502 2036 >90 FRI APR 25 18 53 19 32 20 00 22 40 04 40 05 07 05 46 09 54 13 55 18 36 8.7 6.0 69 0553 2017 >90 SAT APR 26 18 54 19 33 20 00 23 25 04 39 05 06 05 46 09 58 13 59 18 39 8.7 5.2 60 0642 1903 >90 SUN APR 27 18 54 19 33 20 01 00 08 04 38 05 06 05 45 10 03 14 03 18 42 8.6 4.5 52 0735 1636 >90 MON APR 28 18 54 19 34 20 01 00 49 04 37 05 05 05 44 10 07 14 07 18 45 8.6 3.8 44 0820 1406 82 TUE APR 29 18 55 19 34 20 02 01 27 04 37 05 04 05 44 10 12 14 11 18 48 8.6 3.2 36 0907 1038 73 WED APR 30 18 55 19 35 20 02 02 05 04 36 05 03 05 43 10 16 14 15 18 51 8.6 2.5 29 0954 0636 64 ONE LINE REFERS TO EVENING DATE FULL MOON Apr 07 17:21 UT AND FOLLOWING MORNING. LAST QUARTER Apr 14 12:58 UT All dates and times are zone HST NEW MOON Apr 21 16:57 UT in upper table (except sid time). FIRST QUARTER Apr 29 19:19 UT