KECK OBSERVATORY CALENDAR FOR 1999 -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 1999 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 18 18 h h % midnight THU APR 01 18 46 19 24 19 50 19 25 07 46 05 02 05 28 06 05 08 09 12 19 17 22 9.2 0.0 0 1356-0652 FRI APR 02 18 46 19 24 19 50 20 14 05 01 05 27 06 05 08 13 12 23 17 25 9.2 0.4 4 1442-1031 SAT APR 03 18 46 19 24 19 50 21 03 05 00 05 26 06 04 08 17 12 27 17 28 9.2 1.2 13 1529-1343 SUN APR 04 18 47 19 25 19 51 21 52 04 59 05 25 06 03 08 22 12 31 17 31 9.1 2.0 22 1617-1621 MON APR 05 18 47 19 25 19 51 22 42 04 58 05 24 06 02 08 25 12 35 17 34 9.1 2.9 31 1706-1818 TUE APR 06 18 47 19 25 19 52 23 32 04 57 05 23 06 01 08 30 12 39 17 37 9.1 3.7 40 1756-1927 WED APR 07 18 48 19 26 19 52 00 21 04 56 05 22 06 00 08 34 12 43 17 40 9.1 4.5 49 1847-1945 THU APR 08 18 48 19 26 19 52 01 10 04 55 05 21 06 00 08 38 12 47 17 43 9.0 5.3 58 1939-1906 FRI APR 09 18 48 19 26 19 53 01 58 04 54 05 20 05 59 08 43 12 51 17 46 9.0 6.1 67 2032-1731 SAT APR 10 18 48 19 27 19 53 02 45 04 53 05 20 05 58 08 47 12 55 17 49 9.0 6.9 76 2125-1500 SUN APR 11 18 49 19 27 19 53 03 31 04 52 05 19 05 57 08 51 12 59 17 52 9.0 7.6 84 2219-1136 MON APR 12 18 49 19 27 19 54 04 16 04 51 05 18 05 56 08 56 13 03 17 55 9.0 8.4 93 2313-0727 TUE APR 13 18 49 19 28 19 54 05 02 16 45 04 50 05 17 05 55 09 00 13 07 17 57 8.9 8.9 100 0008-0244 WED APR 14 18 50 19 28 19 55 05 48 17 45 04 50 05 16 05 55 09 05 13 11 18 01 8.9 8.9 100 0103+0214 THU APR 15 18 50 19 28 19 55 06 35 18 48 04 49 05 15 05 54 09 09 13 15 18 04 8.9 8.9 100 0200+0711 FRI APR 16 18 50 19 29 19 56 07 25 19 51 04 48 05 14 05 53 09 14 13 18 18 07 8.9 8.9 100 0258+1143 SAT APR 17 18 51 19 29 19 56 20 56 04 47 05 14 05 52 09 18 13 22 18 10 8.9 7.9 88 0358+1529 SUN APR 18 18 51 19 30 19 56 22 01 04 46 05 13 05 51 09 22 13 26 18 13 8.8 6.8 76 0500+1810 MON APR 19 18 51 19 30 19 57 23 03 04 45 05 12 05 51 09 27 13 30 18 16 8.8 5.7 64 0601+1937 TUE APR 20 18 51 19 30 19 57 00 03 04 44 05 11 05 50 09 31 13 34 18 19 8.8 4.7 53 0701+1946 WED APR 21 18 52 19 31 19 58 00 58 04 43 05 10 05 49 09 36 13 38 18 22 8.7 3.8 42 0759+1844 THU APR 22 18 52 19 31 19 58 01 48 04 42 05 09 05 48 09 39 13 42 18 25 8.7 2.9 33 0855+1639 FRI APR 23 18 52 19 32 19 59 02 33 04 42 05 09 05 48 09 44 13 46 18 29 8.7 2.1 24 0948+1346 SAT APR 24 18 53 19 32 19 59 03 15 04 41 05 08 05 47 09 48 13 50 18 32 8.7 1.4 16 1038+1016 SUN APR 25 18 53 19 32 20 00 03 55 04 40 05 07 05 46 09 53 13 54 18 35 8.7 0.7 8 1126+0623 MON APR 26 18 53 19 33 20 00 04 32 04 39 05 06 05 46 09 57 13 58 18 38 8.7 0.1 1 1213+0217 TUE APR 27 18 54 19 33 20 01 16 32 05 09 04 38 05 06 05 45 10 02 14 02 18 41 8.6 0.0 0 1259-0150 WED APR 28 18 54 19 34 20 01 17 21 05 46 04 37 05 05 05 44 10 06 14 06 18 44 8.6 0.0 0 1344-0551 THU APR 29 18 55 19 34 20 02 18 10 06 23 04 37 05 04 05 44 10 11 14 10 18 48 8.6 0.0 0 1430-0937 FRI APR 30 18 55 19 35 20 02 18 59 07 02 04 36 05 03 05 43 10 15 14 14 18 50 8.6 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