KECK OBSERVATORY CALENDAR FOR 1998 -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 1998 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ 12 18 18 12 18 18 h h % midnight TUE SEP 01 18 48 19 26 19 52 02 36 04 52 05 18 05 56 18 15 22 24 03 16 9.0 2.3 25 1916-1836 WED SEP 02 18 47 19 25 19 52 03 33 04 52 05 18 05 57 18 19 22 27 03 20 9.0 1.3 14 2012-1714 THU SEP 03 18 46 19 24 19 51 16 31 04 32 04 52 05 19 05 57 18 22 22 31 03 24 9.0 0.3 3 2109-1449 FRI SEP 04 18 45 19 23 19 50 17 21 05 32 04 53 05 19 05 57 18 25 22 35 03 29 9.0 0.0 0 2206-1127 SAT SEP 05 18 44 19 22 19 49 18 10 06 34 04 53 05 19 05 57 18 28 22 39 03 33 9.1 0.0 0 2303-0719 SUN SEP 06 18 43 19 21 19 48 18 58 07 36 04 53 05 19 05 57 18 31 22 43 03 37 9.1 0.0 0 2359-0240 MON SEP 07 18 42 19 21 19 47 19 45 04 54 05 20 05 58 18 33 22 47 03 42 9.1 0.0 0 0055+0209 TUE SEP 08 18 42 19 20 19 46 20 32 04 54 05 20 05 58 18 36 22 51 03 46 9.1 0.8 8 0152+0650 WED SEP 09 18 41 19 19 19 45 21 20 04 54 05 20 05 58 18 39 22 55 03 50 9.2 1.6 17 0249+1103 THU SEP 10 18 40 19 18 19 44 22 09 04 54 05 20 05 58 18 42 22 59 03 54 9.2 2.4 26 0346+1432 FRI SEP 11 18 39 19 17 19 43 23 00 04 55 05 21 05 59 18 45 23 03 03 59 9.2 3.3 35 0444+1705 SAT SEP 12 18 38 19 16 19 42 23 53 04 55 05 21 05 59 18 48 23 07 04 03 9.2 4.2 45 0542+1834 SUN SEP 13 18 37 19 15 19 41 00 48 04 55 05 21 05 59 18 51 23 11 04 07 9.2 5.1 55 0639+1858 MON SEP 14 18 36 19 14 19 40 01 42 04 56 05 21 05 59 18 54 23 15 04 12 9.3 6.0 65 0735+1817 TUE SEP 15 18 35 19 13 19 39 02 37 04 56 05 22 05 59 18 57 23 19 04 16 9.3 7.0 75 0828+1640 WED SEP 16 18 34 19 12 19 38 03 31 16 11 04 56 05 22 06 00 19 00 23 23 04 19 9.3 7.9 84 0920+1414 THU SEP 17 18 33 19 11 19 37 04 23 16 55 04 56 05 22 06 00 19 03 23 27 04 23 9.3 8.8 94 1010+1111 FRI SEP 18 18 32 19 10 19 36 05 14 17 36 04 57 05 22 06 00 19 06 23 31 04 28 9.3 9.3 100 1058+0740 SAT SEP 19 18 32 19 09 19 35 06 03 18 14 04 57 05 23 06 00 19 09 23 34 04 32 9.4 9.4 100 1145+0354 SUN SEP 20 18 31 19 08 19 34 06 52 18 51 04 57 05 23 06 00 19 12 23 38 04 36 9.4 9.4 100 1230+0000 MON SEP 21 18 30 19 07 19 33 07 40 19 28 04 57 05 23 06 01 19 15 23 42 04 40 9.4 9.4 100 1315-0350 TUE SEP 22 18 29 19 06 19 32 20 05 04 58 05 23 06 01 19 18 23 46 04 45 9.4 8.9 94 1401-0731 WED SEP 23 18 28 19 05 19 31 20 42 04 58 05 23 06 01 19 21 23 50 04 49 9.5 8.3 87 1446-1055 THU SEP 24 18 27 19 05 19 30 21 22 04 58 05 24 06 01 19 23 23 54 04 53 9.5 7.6 80 1533-1352 FRI SEP 25 18 26 19 04 19 29 22 03 04 58 05 24 06 01 19 26 23 58 04 57 9.5 6.9 72 1621-1617 SAT SEP 26 18 25 19 03 19 28 22 47 04 59 05 24 06 02 19 29 00 02 05 02 9.5 6.2 65 1711-1800 SUN SEP 27 18 24 19 02 19 27 23 34 04 59 05 24 06 02 19 32 00 06 05 06 9.5 5.4 56 1803-1855 MON SEP 28 18 23 19 01 19 26 00 25 04 59 05 25 06 02 19 35 00 10 05 10 9.6 4.6 47 1856-1856 TUE SEP 29 18 22 19 00 19 26 01 18 04 59 05 25 06 02 19 39 00 14 05 14 9.6 3.7 38 1950-1759 WED SEP 30 18 22 18 59 19 25 02 15 04 59 05 25 06 03 19 42 00 18 05 18 9.6 2.7 28 2045-1601 ONE LINE REFERS TO EVENING DATE FULL MOON SEP 06 11:23 UT AND FOLLOWING MORNING. LAST QUARTER SEP 13 02:01 UT All dates and times are zone HST NEW MOON SEP 20 17:01 UT in upper table (except sid time). FIRST QUARTER SEP 28 21:14 UT