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 THU SEP 01 18 48 19 26 19 53 21 38 04 52 05 18 05 56 18 15 22 23 03 16 9.0 7.2 80 1420-1751 >90 FRI SEP 02 18 47 19 25 19 52 22 30 04 52 05 18 05 57 18 18 22 27 03 20 9.0 6.4 70 1518-2101 >90 SAT SEP 03 18 46 19 24 19 51 23 25 04 52 05 19 05 57 18 21 22 31 03 24 9.0 5.5 60 1618-2253 >90 SUN SEP 04 18 45 19 23 19 50 00 22 04 53 05 19 05 57 18 24 22 35 03 29 9.0 4.5 49 1719-2314 89 MON SEP 05 18 44 19 22 19 49 01 19 04 53 05 19 05 57 18 27 22 39 03 32 9.1 3.6 39 1815-2229 77 TUE SEP 06 18 43 19 21 19 48 14 33 02 16 04 53 05 19 05 57 18 30 22 43 03 36 9.1 2.6 28 1911-2030 66 WED SEP 07 18 43 19 21 19 47 15 19 03 11 04 54 05 20 05 58 18 33 22 47 03 41 9.1 1.7 18 2004-1727 55 THU SEP 08 18 42 19 20 19 46 16 02 04 04 04 54 05 20 05 58 18 36 22 51 03 45 9.1 0.8 9 2054-1339 44 FRI SEP 09 18 41 19 19 19 45 16 41 04 56 04 54 05 20 05 58 18 39 22 54 03 49 9.2 0.0 0 2142-0918 34 SAT SEP 10 18 40 19 18 19 44 17 17 05 45 04 54 05 20 05 58 18 42 22 58 03 53 9.2 0.0 0 2229-0438 26 SUN SEP 11 18 39 19 17 19 43 17 52 06 34 04 55 05 21 05 59 18 45 23 02 03 58 9.2 0.0 0 2314 0008 20 MON SEP 12 18 38 19 16 19 42 18 26 04 55 05 21 05 59 18 48 23 06 04 02 9.2 0.0 0 2359 0451 20 TUE SEP 13 18 37 19 15 19 41 19 01 04 55 05 21 05 59 18 51 23 10 04 06 9.2 0.0 0 0044 0919 25 WED SEP 14 18 36 19 14 19 40 19 37 04 56 05 21 05 59 18 53 23 14 04 11 9.3 0.0 0 0130 1323 33 THU SEP 15 18 35 19 13 19 39 20 15 04 56 05 22 05 59 18 56 23 18 04 15 9.3 0.6 6 0217 1653 43 FRI SEP 16 18 34 19 12 19 38 20 56 04 56 05 22 06 00 18 59 23 22 04 19 9.3 1.3 13 0306 1941 53 SAT SEP 17 18 33 19 11 19 37 21 39 04 56 05 22 06 00 19 02 23 26 04 23 9.3 2.0 21 0357 2137 63 SUN SEP 18 18 33 19 10 19 36 22 27 04 57 05 22 06 00 19 05 23 30 04 28 9.3 2.9 30 0450 2233 74 MON SEP 19 18 32 19 09 19 35 23 19 04 57 05 23 06 00 19 08 23 34 04 32 9.4 3.7 39 0543 2221 85 TUE SEP 20 18 31 19 08 19 34 00 14 04 57 05 23 06 00 19 11 23 38 04 36 9.4 4.7 49 0638 2106 >90 WED SEP 21 18 30 19 07 19 33 01 11 14 07 04 57 05 23 06 01 19 14 23 42 04 40 9.4 5.6 59 0733 1838 >90 THU SEP 22 18 29 19 06 19 32 02 10 14 54 04 58 05 23 06 01 19 17 23 46 04 45 9.4 6.6 70 0827 1505 >90 FRI SEP 23 18 28 19 05 19 31 03 11 15 39 04 58 05 23 06 01 19 20 23 50 04 48 9.5 7.7 81 0921 1036 >90 SAT SEP 24 18 27 19 05 19 30 04 12 16 24 04 58 05 24 06 01 19 23 23 54 04 52 9.5 8.7 91 1015 0524 >90 SUN SEP 25 18 26 19 04 19 29 05 14 17 08 04 58 05 24 06 01 19 26 23 58 04 56 9.5 9.5 100 1109-0014 >90 MON SEP 26 18 25 19 03 19 28 06 18 17 52 04 59 05 24 06 02 19 29 00 01 05 01 9.5 9.5 100 1204-0557 >90 TUE SEP 27 18 24 19 02 19 27 18 38 04 59 05 24 06 02 19 32 00 05 05 05 9.5 9.5 100 1301-1123 >90 WED SEP 28 18 23 19 01 19 26 19 28 04 59 05 25 06 02 19 35 00 09 05 09 9.6 9.5 99 1359-1606 >90 THU SEP 29 18 23 19 00 19 26 20 20 04 59 05 25 06 02 19 39 00 13 05 13 9.6 8.6 90 1459-1946 >90 FRI SEP 30 18 22 18 59 19 25 21 16 05 00 05 25 06 03 19 41 00 17 05 18 9.6 7.7 80 1600-2205 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Sep 04 17:38 UT AND FOLLOWING MORNING. FULL MOON Sep 12 09:25 UT All dates and times are zone HST LAST QUARTER Sep 20 13:39 UT in upper table (except sid time). NEW MOON Sep 27 11:09 UT