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 FRI MAY 01 18 55 19 35 20 03 00 24 04 35 05 03 05 42 10 21 14 19 18 54 8.5 4.2 49 0810+1654 SAT MAY 02 18 56 19 35 20 03 01 10 04 34 05 02 05 42 10 25 14 23 18 57 8.5 3.4 39 0902+1440 SUN MAY 03 18 56 19 36 20 04 01 52 04 34 05 01 05 41 10 30 14 26 19 01 8.5 2.7 31 0951+1149 MON MAY 04 18 56 19 36 20 04 02 32 04 33 05 01 05 41 10 34 14 30 19 04 8.5 2.0 23 1039+0830 TUE MAY 05 18 57 19 37 20 05 03 09 04 32 05 00 05 40 10 39 14 34 19 07 8.4 1.4 16 1124+0454 WED MAY 06 18 57 19 37 20 05 03 46 04 31 04 59 05 40 10 43 14 38 19 10 8.4 0.7 8 1209+0108 THU MAY 07 18 58 19 38 20 06 04 22 04 31 04 59 05 39 10 48 14 42 19 14 8.4 0.1 1 1254-0239 FRI MAY 08 18 58 19 38 20 06 16 35 04 59 04 30 04 58 05 39 10 52 14 46 19 17 8.4 0.0 0 1339-0622 SAT MAY 09 18 58 19 39 20 07 17 23 05 37 04 29 04 58 05 38 10 56 14 50 19 20 8.4 0.0 0 1425-0951 SUN MAY 10 18 59 19 39 20 08 18 13 06 17 04 29 04 57 05 38 11 01 14 54 19 24 8.3 0.0 0 1513-1258 MON MAY 11 18 59 19 40 20 08 19 03 07 00 04 28 04 56 05 37 11 05 14 58 19 27 8.3 0.0 0 1602-1535 TUE MAY 12 19 00 19 40 20 09 19 55 07 46 04 28 04 56 05 37 11 10 15 02 19 31 8.3 0.0 0 1652-1731 WED MAY 13 19 00 19 41 20 09 20 46 04 27 04 55 05 36 11 14 15 06 19 34 8.3 0.6 7 1745-1839 THU MAY 14 19 00 19 41 20 10 21 38 04 26 04 55 05 36 11 19 15 10 19 37 8.3 1.5 17 1838-1852 FRI MAY 15 19 01 19 42 20 10 22 29 04 26 04 54 05 35 11 23 15 14 19 41 8.3 2.3 28 1933-1807 SAT MAY 16 19 01 19 42 20 11 23 19 04 25 04 54 05 35 11 28 15 18 19 43 8.2 3.1 38 2027-1623 SUN MAY 17 19 02 19 43 20 11 00 08 04 25 04 54 05 35 11 32 15 22 19 47 8.2 4.0 47 2122-1344 MON MAY 18 19 02 19 43 20 12 00 54 04 24 04 53 05 34 11 37 15 26 19 50 8.2 4.7 57 2216-1018 TUE MAY 19 19 03 19 44 20 13 01 40 04 24 04 53 05 34 11 42 15 30 19 54 8.2 5.4 66 2310-0612 WED MAY 20 19 03 19 44 20 13 02 26 04 23 04 52 05 34 11 46 15 33 19 57 8.2 6.2 76 0005-0140 THU MAY 21 19 03 19 45 20 14 03 12 04 23 04 52 05 33 11 51 15 37 20 01 8.1 7.0 85 0100+0303 FRI MAY 22 19 04 19 45 20 14 03 59 16 12 04 22 04 52 05 33 11 55 15 41 20 04 8.1 7.7 95 0157+0739 SAT MAY 23 19 04 19 46 20 15 04 49 17 15 04 22 04 51 05 33 12 00 15 45 20 08 8.1 8.1 100 0255+1149 SUN MAY 24 19 05 19 46 20 15 05 41 18 18 04 22 04 51 05 33 12 04 15 49 20 12 8.1 8.1 100 0354+1513 MON MAY 25 19 05 19 47 20 16 06 36 19 21 04 21 04 51 05 32 12 09 15 53 20 15 8.1 8.1 100 0454+1736 TUE MAY 26 19 05 19 47 20 17 07 32 20 23 04 21 04 50 05 32 12 14 15 57 20 19 8.1 8.0 98 0554+1849 WED MAY 27 19 06 19 48 20 17 21 21 04 21 04 50 05 32 12 17 16 01 20 23 8.1 7.0 86 0653+1850 THU MAY 28 19 06 19 48 20 18 22 15 04 20 04 50 05 32 12 22 16 05 20 26 8.0 6.1 75 0750+1745 FRI MAY 29 19 07 19 49 20 18 23 04 04 20 04 50 05 32 12 26 16 09 20 30 8.0 5.3 65 0844+1546 SAT MAY 30 19 07 19 49 20 19 23 49 04 20 04 49 05 31 12 31 16 13 20 34 8.0 4.5 56 0936+1303 SUN MAY 31 19 08 19 50 20 19 00 30 04 20 04 49 05 31 12 35 16 17 20 38 8.0 3.8 47 1024+0949 ONE LINE REFERS TO EVENING DATE FIRST QUARTER MAY 03 10:06 UT AND FOLLOWING MORNING. FULL MOON MAY 11 14:34 UT All dates and times are zone HST LAST QUARTER MAY 19 04:39 UT in upper table (except sid time). NEW MOON MAY 25 19:35 UT