KECK OBSERVATORY CALENDAR FOR 2001 -NAUTICAL (computed for altitude 4145.0 m) NAUTICAL(12 deg) TWILIGHT/DAWN MOON DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (12 deg) RA DEC 2001 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 12 12 h h % midnight SUN APR 01 18 46 19 24 19 50 02 19 05 02 05 28 06 05 07 45 12 21 17 50 10.1 3.2 31 0755+2212 MON APR 02 18 46 19 24 19 50 03 13 05 01 05 27 06 05 07 49 12 25 17 53 10.1 2.2 22 0855+1958 TUE APR 03 18 46 19 24 19 50 04 04 05 00 05 26 06 04 07 53 12 29 17 56 10.0 1.4 13 0955+1625 WED APR 04 18 47 19 25 19 51 04 51 04 59 05 25 06 03 07 57 12 33 17 59 10.0 0.6 5 1052+1151 THU APR 05 18 47 19 25 19 51 16 28 05 36 04 58 05 24 06 02 08 01 12 37 18 02 10.0 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 05 12 41 18 05 10.0 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 10 12 45 18 08 9.9 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 14 12 49 18 11 9.9 0.0 0 1426-0949 MON APR 09 18 48 19 26 19 53 20 25 04 54 05 20 05 59 08 18 12 53 18 14 9.9 1.0 9 1519-1425 TUE APR 10 18 48 19 27 19 53 21 22 04 53 05 20 05 58 08 23 12 57 18 18 9.9 1.9 19 1612-1811 WED APR 11 18 49 19 27 19 53 22 18 04 52 05 19 05 57 08 27 13 01 18 21 9.9 2.8 28 1705-2056 THU APR 12 18 49 19 27 19 54 23 13 04 51 05 18 05 56 08 31 13 05 18 24 9.8 3.8 38 1759-2235 FRI APR 13 18 49 19 28 19 54 00 05 04 50 05 17 05 55 08 36 13 09 18 27 9.8 4.6 47 1852-2307 SAT APR 14 18 50 19 28 19 55 00 54 04 50 05 16 05 55 08 40 13 13 18 30 9.8 5.4 55 1944-2233 SUN APR 15 18 50 19 28 19 55 01 39 04 49 05 15 05 54 08 44 13 17 18 32 9.8 6.2 63 2035-2059 MON APR 16 18 50 19 29 19 56 02 22 04 48 05 14 05 53 08 49 13 21 18 35 9.7 6.9 70 2124-1831 TUE APR 17 18 51 19 29 19 56 03 02 04 47 05 14 05 52 08 53 13 24 18 39 9.7 7.5 77 2212-1516 WED APR 18 18 51 19 30 19 56 03 40 04 46 05 13 05 51 08 58 13 28 18 42 9.7 8.2 84 2258-1123 THU APR 19 18 51 19 30 19 57 04 16 04 45 05 12 05 51 09 02 13 32 18 45 9.7 8.8 90 2344-0658 FRI APR 20 18 51 19 30 19 57 04 52 16 41 04 44 05 11 05 50 09 06 13 36 18 48 9.7 9.4 96 0030-0213 SAT APR 21 18 52 19 31 19 58 05 28 17 32 04 43 05 10 05 49 09 11 13 40 18 51 9.7 9.7 100 0116+0244 SUN APR 22 18 52 19 31 19 58 06 06 18 25 04 42 05 09 05 48 09 14 13 44 18 54 9.6 9.6 100 0204+0741 MON APR 23 18 52 19 32 19 59 06 46 19 19 04 42 05 09 05 48 09 19 13 48 18 58 9.6 9.6 100 0254+1223 TUE APR 24 18 53 19 32 19 59 07 31 20 16 04 41 05 08 05 47 09 23 13 52 19 01 9.6 8.9 92 0346+1635 WED APR 25 18 53 19 32 20 00 21 15 04 40 05 07 05 46 09 27 13 56 19 04 9.6 7.9 82 0442+1958 THU APR 26 18 53 19 33 20 00 22 16 04 39 05 06 05 46 09 32 14 00 19 07 9.6 6.8 71 0540+2215 FRI APR 27 18 54 19 33 20 01 23 16 04 38 05 06 05 45 09 36 14 04 19 11 9.6 5.8 61 0640+2313 SAT APR 28 18 54 19 34 20 01 00 15 04 37 05 05 05 44 09 41 14 08 19 14 9.5 4.8 50 0741+2245 SUN APR 29 18 55 19 34 20 02 01 10 04 37 05 04 05 44 09 45 14 12 19 17 9.5 3.9 41 0841+2050 MON APR 30 18 55 19 35 20 02 02 01 04 36 05 03 05 43 09 50 14 16 19 20 9.5 3.0 32 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