KECK OBSERVATORY CALENDAR FOR 1998 -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 1998 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 12 12 h h % midnight WED APR 01 18 46 19 24 19 50 23 56 05 02 05 28 06 05 07 44 12 20 17 49 10.1 5.5 54 0543+1821 THU APR 02 18 46 19 24 19 50 00 51 05 01 05 27 06 05 07 47 12 24 17 52 10.1 4.6 45 0639+1833 FRI APR 03 18 46 19 24 19 50 01 42 05 00 05 26 06 04 07 51 12 28 17 55 10.0 3.7 37 0733+1746 SAT APR 04 18 47 19 25 19 51 02 29 04 59 05 25 06 03 07 56 12 32 17 58 10.0 2.9 29 0825+1607 SUN APR 05 18 47 19 25 19 51 03 12 04 58 05 24 06 02 08 00 12 36 18 01 10.0 2.2 22 0916+1344 MON APR 06 18 47 19 25 19 52 03 53 04 57 05 23 06 01 08 04 12 40 18 04 10.0 1.5 15 1004+1047 TUE APR 07 18 48 19 26 19 52 04 31 04 56 05 22 06 00 08 09 12 44 18 07 9.9 0.9 8 1050+0726 WED APR 08 18 48 19 26 19 52 16 14 05 09 04 55 05 21 06 00 08 13 12 48 18 10 9.9 0.2 2 1136+0348 THU APR 09 18 48 19 26 19 53 17 03 05 45 04 54 05 20 05 59 08 17 12 52 18 13 9.9 0.0 0 1221+0003 FRI APR 10 18 48 19 27 19 53 17 51 06 21 04 53 05 20 05 58 08 22 12 56 18 17 9.9 0.0 0 1306-0342 SAT APR 11 18 49 19 27 19 53 18 39 06 59 04 52 05 19 05 57 08 26 13 00 18 20 9.9 0.0 0 1351-0719 SUN APR 12 18 49 19 27 19 54 19 27 07 38 04 51 05 18 05 56 08 30 13 04 18 23 9.8 0.0 0 1437-1041 MON APR 13 18 49 19 28 19 54 20 17 04 50 05 17 05 55 08 35 13 08 18 25 9.8 0.8 8 1525-1338 TUE APR 14 18 50 19 28 19 55 21 07 04 50 05 16 05 55 08 39 13 12 18 28 9.8 1.6 16 1614-1601 WED APR 15 18 50 19 28 19 55 21 58 04 49 05 15 05 54 08 43 13 16 18 31 9.8 2.5 25 1705-1743 THU APR 16 18 50 19 29 19 56 22 50 04 48 05 14 05 53 08 48 13 19 18 34 9.7 3.4 34 1757-1836 FRI APR 17 18 51 19 29 19 56 23 41 04 47 05 14 05 52 08 52 13 23 18 38 9.7 4.2 43 1851-1834 SAT APR 18 18 51 19 30 19 56 00 32 04 46 05 13 05 51 08 57 13 27 18 41 9.7 5.0 51 1945-1733 SUN APR 19 18 51 19 30 19 57 01 22 04 45 05 12 05 51 09 01 13 31 18 44 9.7 5.9 60 2041-1534 MON APR 20 18 51 19 30 19 57 02 11 04 44 05 11 05 50 09 04 13 35 18 47 9.7 6.7 69 2136-1239 TUE APR 21 18 52 19 31 19 58 02 59 04 43 05 10 05 49 09 09 13 39 18 50 9.7 7.5 77 2232-0855 WED APR 22 18 52 19 31 19 58 03 46 04 42 05 09 05 48 09 13 13 43 18 53 9.6 8.3 85 2328-0432 THU APR 23 18 52 19 32 19 59 04 34 16 24 04 42 05 09 05 48 09 18 13 47 18 57 9.6 9.0 93 0025+0012 FRI APR 24 18 53 19 32 19 59 05 22 17 27 04 41 05 08 05 47 09 22 13 51 19 00 9.6 9.6 100 0122+0501 SAT APR 25 18 53 19 32 20 00 06 12 18 31 04 40 05 07 05 46 09 26 13 55 19 03 9.6 9.6 100 0221+0932 SUN APR 26 18 53 19 33 20 00 07 03 19 35 04 39 05 06 05 46 09 31 13 59 19 06 9.6 9.5 99 0320+1324 MON APR 27 18 54 19 33 20 01 07 57 20 39 04 38 05 06 05 45 09 35 14 03 19 10 9.6 8.5 88 0420+1619 TUE APR 28 18 54 19 34 20 01 21 41 04 37 05 05 05 44 09 40 14 07 19 13 9.5 7.4 77 0520+1808 WED APR 29 18 55 19 34 20 02 22 40 04 37 05 04 05 44 09 44 14 11 19 16 9.5 6.4 67 0619+1847 THU APR 30 18 55 19 35 20 02 23 34 04 36 05 03 05 43 09 49 14 15 19 18 9.5 5.5 57 0716+1820 ONE LINE REFERS TO EVENING DATE FIRST QUARTER APR 03 20:20 UT AND FOLLOWING MORNING. FULL MOON APR 11 22:27 UT All dates and times are zone HST LAST QUARTER APR 19 19:57 UT in upper table (except sid time). NEW MOON APR 26 11:43 UT