KECK OBSERVATORY CALENDAR FOR 1999 -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 1999 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 12 12 h h % midnight THU APR 01 18 46 19 24 19 50 19 25 07 46 05 02 05 28 06 05 07 43 12 19 17 48 10.1 0.0 0 1356-0652 FRI APR 02 18 46 19 24 19 50 20 14 05 01 05 27 06 05 07 47 12 23 17 51 10.1 0.8 8 1442-1031 SAT APR 03 18 46 19 24 19 50 21 03 05 00 05 26 06 04 07 50 12 27 17 54 10.0 1.6 16 1529-1343 SUN APR 04 18 47 19 25 19 51 21 52 04 59 05 25 06 03 07 55 12 31 17 57 10.0 2.5 24 1617-1621 MON APR 05 18 47 19 25 19 51 22 42 04 58 05 24 06 02 07 59 12 35 18 00 10.0 3.3 32 1706-1818 TUE APR 06 18 47 19 25 19 52 23 32 04 57 05 23 06 01 08 03 12 39 18 03 10.0 4.1 41 1756-1927 WED APR 07 18 48 19 26 19 52 00 21 04 56 05 22 06 00 08 08 12 43 18 06 9.9 4.9 49 1847-1945 THU APR 08 18 48 19 26 19 52 01 10 04 55 05 21 06 00 08 12 12 47 18 09 9.9 5.7 57 1939-1906 FRI APR 09 18 48 19 26 19 53 01 58 04 54 05 20 05 59 08 16 12 51 18 12 9.9 6.5 65 2032-1731 SAT APR 10 18 48 19 27 19 53 02 45 04 53 05 20 05 58 08 21 12 55 18 16 9.9 7.3 73 2125-1500 SUN APR 11 18 49 19 27 19 53 03 31 04 52 05 19 05 57 08 25 12 59 18 19 9.9 8.1 81 2219-1136 MON APR 12 18 49 19 27 19 54 04 16 04 51 05 18 05 56 08 29 13 03 18 22 9.8 8.8 89 2313-0727 TUE APR 13 18 49 19 28 19 54 05 02 16 45 04 50 05 17 05 55 08 34 13 07 18 25 9.8 9.6 97 0008-0244 WED APR 14 18 50 19 28 19 55 05 48 17 45 04 50 05 16 05 55 08 38 13 11 18 27 9.8 9.8 100 0103+0214 THU APR 15 18 50 19 28 19 55 06 35 18 48 04 49 05 15 05 54 08 42 13 15 18 30 9.8 9.8 100 0200+0711 FRI APR 16 18 50 19 29 19 56 07 25 19 51 04 48 05 14 05 53 08 47 13 18 18 33 9.7 9.4 96 0258+1143 SAT APR 17 18 51 19 29 19 56 20 56 04 47 05 14 05 52 08 51 13 22 18 37 9.7 8.3 85 0358+1529 SUN APR 18 18 51 19 30 19 56 22 01 04 46 05 13 05 51 08 56 13 26 18 40 9.7 7.2 74 0500+1810 MON APR 19 18 51 19 30 19 57 23 03 04 45 05 12 05 51 09 00 13 30 18 43 9.7 6.2 63 0601+1937 TUE APR 20 18 51 19 30 19 57 00 03 04 44 05 11 05 50 09 04 13 34 18 46 9.7 5.1 53 0701+1946 WED APR 21 18 52 19 31 19 58 00 58 04 43 05 10 05 49 09 08 13 38 18 49 9.7 4.2 43 0759+1844 THU APR 22 18 52 19 31 19 58 01 48 04 42 05 09 05 48 09 12 13 42 18 52 9.6 3.4 34 0855+1639 FRI APR 23 18 52 19 32 19 59 02 33 04 42 05 09 05 48 09 17 13 46 18 56 9.6 2.6 27 0948+1346 SAT APR 24 18 53 19 32 19 59 03 15 04 41 05 08 05 47 09 21 13 50 18 59 9.6 1.9 19 1038+1016 SUN APR 25 18 53 19 32 20 00 03 55 04 40 05 07 05 46 09 25 13 54 19 02 9.6 1.2 12 1126+0623 MON APR 26 18 53 19 33 20 00 04 32 04 39 05 06 05 46 09 30 13 58 19 05 9.6 0.6 5 1213+0217 TUE APR 27 18 54 19 33 20 01 16 32 05 09 04 38 05 06 05 45 09 34 14 02 19 09 9.6 0.0 0 1259-0150 WED APR 28 18 54 19 34 20 01 17 21 05 46 04 37 05 05 05 44 09 39 14 06 19 12 9.5 0.0 0 1344-0551 THU APR 29 18 55 19 34 20 02 18 10 06 23 04 37 05 04 05 44 09 43 14 10 19 15 9.5 0.0 0 1430-0937 FRI APR 30 18 55 19 35 20 02 18 59 07 02 04 36 05 03 05 43 09 48 14 14 19 18 9.5 0.0 0 1516-1259 ONE LINE REFERS TO EVENING DATE LAST QUARTER APR 09 02:54 UT AND FOLLOWING MORNING. NEW MOON APR 16 04:23 UT All dates and times are zone HST FIRST QUARTER APR 22 19:04 UT in upper table (except sid time). FULL MOON APR 30 14:57 UT