KECK OBSERVATORY CALENDAR FOR 2001 -ASTRONOMICAL (computed for altitude 4145.0 m) ASTRONOMICAL(18 deg) TWILIGHT/DAWN MOON DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (18 deg) RA DEC 2001 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 18 18 h h % midnight SUN APR 01 18 46 19 24 19 50 02 19 05 02 05 28 06 05 08 11 12 21 17 24 9.2 2.7 29 0755+2212 MON APR 02 18 46 19 24 19 50 03 13 05 01 05 27 06 05 08 15 12 25 17 27 9.2 1.8 19 0855+1958 TUE APR 03 18 46 19 24 19 50 04 04 05 00 05 26 06 04 08 19 12 29 17 30 9.2 0.9 10 0955+1625 WED APR 04 18 47 19 25 19 51 04 51 04 59 05 25 06 03 08 24 12 33 17 33 9.1 0.1 1 1052+1151 THU APR 05 18 47 19 25 19 51 16 28 05 36 04 58 05 24 06 02 08 27 12 37 17 36 9.1 0.0 0 1147+0635 FRI APR 06 18 47 19 25 19 52 17 29 06 18 04 57 05 23 06 01 08 32 12 41 17 39 9.1 0.0 0 1241+0059 SAT APR 07 18 48 19 26 19 52 18 29 07 00 04 56 05 22 06 00 08 36 12 45 17 42 9.1 0.0 0 1334-0435 SUN APR 08 18 48 19 26 19 52 19 27 07 43 04 55 05 21 06 00 08 40 12 49 17 45 9.0 0.0 0 1426-0949 MON APR 09 18 48 19 26 19 53 20 25 04 54 05 20 05 59 08 45 12 53 17 48 9.0 0.5 5 1519-1425 TUE APR 10 18 48 19 27 19 53 21 22 04 53 05 20 05 58 08 49 12 57 17 51 9.0 1.5 16 1612-1811 WED APR 11 18 49 19 27 19 53 22 18 04 52 05 19 05 57 08 53 13 01 17 54 9.0 2.4 26 1705-2056 THU APR 12 18 49 19 27 19 54 23 13 04 51 05 18 05 56 08 58 13 05 17 57 9.0 3.3 37 1759-2235 FRI APR 13 18 49 19 28 19 54 00 05 04 50 05 17 05 55 09 02 13 09 17 59 8.9 4.2 46 1852-2307 SAT APR 14 18 50 19 28 19 55 00 54 04 50 05 16 05 55 09 07 13 13 18 03 8.9 5.0 55 1944-2233 SUN APR 15 18 50 19 28 19 55 01 39 04 49 05 15 05 54 09 11 13 17 18 06 8.9 5.7 64 2035-2059 MON APR 16 18 50 19 29 19 56 02 22 04 48 05 14 05 53 09 16 13 21 18 09 8.9 6.4 72 2124-1831 TUE APR 17 18 51 19 29 19 56 03 02 04 47 05 14 05 52 09 20 13 24 18 12 8.9 7.1 80 2212-1516 WED APR 18 18 51 19 30 19 56 03 40 04 46 05 13 05 51 09 24 13 28 18 15 8.8 7.7 87 2258-1123 THU APR 19 18 51 19 30 19 57 04 16 04 45 05 12 05 51 09 29 13 32 18 18 8.8 8.3 94 2344-0658 FRI APR 20 18 51 19 30 19 57 04 52 16 41 04 44 05 11 05 50 09 33 13 36 18 21 8.8 8.8 100 0030-0213 SAT APR 21 18 52 19 31 19 58 05 28 17 32 04 43 05 10 05 49 09 38 13 40 18 24 8.7 8.7 100 0116+0244 SUN APR 22 18 52 19 31 19 58 06 06 18 25 04 42 05 09 05 48 09 42 13 44 18 27 8.7 8.7 100 0204+0741 MON APR 23 18 52 19 32 19 59 06 46 19 19 04 42 05 09 05 48 09 46 13 48 18 31 8.7 8.7 100 0254+1223 TUE APR 24 18 53 19 32 19 59 07 31 20 16 04 41 05 08 05 47 09 50 13 52 18 34 8.7 8.4 96 0346+1635 WED APR 25 18 53 19 32 20 00 21 15 04 40 05 07 05 46 09 55 13 56 18 37 8.7 7.4 85 0442+1958 THU APR 26 18 53 19 33 20 00 22 16 04 39 05 06 05 46 09 59 14 00 18 40 8.7 6.4 73 0540+2215 FRI APR 27 18 54 19 33 20 01 23 16 04 38 05 06 05 45 10 04 14 04 18 43 8.6 5.4 62 0640+2313 SAT APR 28 18 54 19 34 20 01 00 15 04 37 05 05 05 44 10 08 14 08 18 46 8.6 4.4 50 0741+2245 SUN APR 29 18 55 19 34 20 02 01 10 04 37 05 04 05 44 10 13 14 12 18 50 8.6 3.5 40 0841+2050 MON APR 30 18 55 19 35 20 02 02 01 04 36 05 03 05 43 10 17 14 16 18 52 8.6 2.6 30 0940+1739 ONE LINE REFERS TO EVENING DATE FIRST QUARTER APR 01 10:52 UT AND FOLLOWING MORNING. FULL MOON APR 08 03:26 UT All dates and times are zone HST LAST QUARTER APR 15 15:35 UT in upper table (except sid time). NEW MOON APR 23 15:30 UT FIRST QUARTER APR 30 17:10 UT