KECK OBSERVATORY CALENDAR FOR 2011 -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 2011 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 APR 01 18 46 19 24 19 50 05 21 17 33 05 02 05 28 06 06 08 09 12 20 17 23 9.2 9.2 100 2350 0357 >90 SAT APR 02 18 46 19 24 19 50 05 55 18 21 05 01 05 27 06 05 08 13 12 24 17 25 9.2 9.2 100 0033 0827 >90 SUN APR 03 18 47 19 24 19 51 06 31 19 10 05 00 05 26 06 04 08 18 12 28 17 28 9.1 9.1 100 0118 1238 >90 MON APR 04 18 47 19 25 19 51 20 01 04 59 05 25 06 03 08 22 12 32 17 31 9.1 9.0 98 0204 1621 >90 TUE APR 05 18 47 19 25 19 51 20 53 04 58 05 24 06 02 08 26 12 35 17 34 9.1 8.1 88 0253 1925 >90 WED APR 06 18 47 19 25 19 52 21 46 04 57 05 23 06 01 08 31 12 39 17 37 9.1 7.2 79 0343 2140 >90 THU APR 07 18 48 19 26 19 52 22 39 04 56 05 22 06 00 08 35 12 43 17 40 9.1 6.3 69 0436 2255 >90 FRI APR 08 18 48 19 26 19 52 23 32 04 55 05 21 06 00 08 39 12 47 17 43 9.0 5.4 59 0531 2302 >90 SAT APR 09 18 48 19 26 19 53 00 24 04 54 05 20 05 59 08 44 12 51 17 46 9.0 4.5 49 0627 2149 88 SUN APR 10 18 48 19 27 19 53 01 12 04 53 05 20 05 58 08 48 12 55 17 49 9.0 3.7 40 0722 1934 78 MON APR 11 18 49 19 27 19 53 01 59 04 52 05 19 05 57 08 51 12 59 17 52 9.0 2.9 32 0817 1603 67 TUE APR 12 18 49 19 27 19 54 02 43 04 51 05 18 05 56 08 56 13 03 17 55 9.0 2.1 23 0912 1130 56 WED APR 13 18 49 19 28 19 54 14 20 03 27 04 50 05 17 05 55 09 00 13 07 17 58 8.9 1.4 15 1007 0609 46 THU APR 14 18 50 19 28 19 55 15 21 04 10 04 50 05 16 05 55 09 05 13 11 18 02 8.9 0.7 7 1102 0015 37 FRI APR 15 18 50 19 29 19 55 16 23 04 54 04 49 05 15 05 54 09 09 13 15 18 05 8.9 0.0 0 1158-0547 32 SAT APR 16 18 50 19 29 19 56 17 26 05 41 04 48 05 14 05 53 09 14 13 19 18 08 8.9 0.0 0 1255-1134 32 SUN APR 17 18 51 19 29 19 56 18 31 06 31 04 47 05 14 05 52 09 18 13 23 18 11 8.9 0.0 0 1355-1638 37 MON APR 18 18 51 19 30 19 56 19 37 04 46 05 13 05 51 09 22 13 27 18 14 8.8 0.0 0 1457-2034 46 TUE APR 19 18 51 19 30 19 57 20 42 04 45 05 12 05 51 09 27 13 31 18 16 8.8 0.8 8 1600-2304 56 WED APR 20 18 52 19 30 19 57 21 44 04 44 05 11 05 50 09 31 13 35 18 19 8.8 1.8 20 1702-2401 67 THU APR 21 18 52 19 31 19 58 22 42 04 43 05 10 05 49 09 36 13 39 18 22 8.7 2.7 31 1802-2323 77 FRI APR 22 18 52 19 31 19 58 23 34 04 42 05 09 05 49 09 40 13 42 18 25 8.7 3.6 41 1858-2127 88 SAT APR 23 18 53 19 32 19 59 00 20 04 42 05 09 05 48 09 45 13 46 18 29 8.7 4.3 49 1953-1840 >90 SUN APR 24 18 53 19 32 19 59 01 02 04 41 05 08 05 47 09 49 13 50 18 32 8.7 5.0 58 2043-1502 >90 MON APR 25 18 53 19 32 20 00 01 40 04 40 05 07 05 46 09 54 13 54 18 35 8.7 5.7 65 2129-1053 >90 TUE APR 26 18 54 19 33 20 00 02 15 04 39 05 06 05 46 09 58 13 58 18 38 8.7 6.2 72 2214-0625 >90 WED APR 27 18 54 19 33 20 01 02 48 14 42 04 38 05 06 05 45 10 03 14 02 18 41 8.6 6.8 78 2257-0147 >90 THU APR 28 18 54 19 34 20 01 03 22 15 29 04 37 05 05 05 44 10 06 14 06 18 44 8.6 7.4 85 2340 0252 >90 FRI APR 29 18 55 19 34 20 02 03 56 16 17 04 37 05 04 05 44 10 11 14 10 18 48 8.6 7.9 92 0023 0722 >90 SAT APR 30 18 55 19 35 20 02 04 31 17 06 04 36 05 03 05 43 10 15 14 14 18 51 8.6 8.5 99 0108 1137 >90 ONE LINE REFERS TO EVENING DATE NEW MOON Apr 03 14:33 UT AND FOLLOWING MORNING. FIRST QUARTER Apr 11 12:07 UT All dates and times are zone HST FULL MOON Apr 18 02:44 UT in upper table (except sid time). LAST QUARTER Apr 25 02:47 UT