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 WED JUL 01 19 16 19 58 20 29 00 57 04 23 04 53 05 35 14 48 18 19 22 43 7.9 3.4 43 1312-0346 THU JUL 02 19 16 19 59 20 29 01 34 04 23 04 53 05 36 14 51 18 23 22 47 7.9 2.8 35 1358-0728 FRI JUL 03 19 16 19 59 20 29 02 12 04 24 04 54 05 36 14 55 18 27 22 52 7.9 2.2 27 1444-1053 SAT JUL 04 19 16 19 59 20 28 02 52 04 24 04 54 05 36 14 58 18 31 22 56 7.9 1.5 19 1532-1354 SUN JUL 05 19 16 19 58 20 28 03 36 04 24 04 54 05 37 15 02 18 35 23 00 7.9 0.8 10 1622-1621 MON JUL 06 19 16 19 58 20 28 16 32 04 23 04 25 04 55 05 37 15 06 18 39 23 05 7.9 0.0 0 1714-1805 TUE JUL 07 19 16 19 58 20 28 17 25 05 14 04 25 04 55 05 37 15 10 18 43 23 08 7.9 0.0 0 1808-1857 WED JUL 08 19 16 19 58 20 28 18 19 06 08 04 26 04 56 05 38 15 14 18 47 23 13 8.0 0.0 0 1903-1850 THU JUL 09 19 16 19 58 20 28 19 11 07 04 04 26 04 56 05 38 15 18 18 51 23 17 8.0 0.0 0 1959-1740 FRI JUL 10 19 16 19 58 20 28 20 02 04 27 04 56 05 39 15 22 18 55 23 22 8.0 0.0 0 2055-1529 SAT JUL 11 19 16 19 58 20 28 20 52 04 27 04 57 05 39 15 26 18 59 23 26 8.0 0.4 5 2151-1224 SUN JUL 12 19 16 19 58 20 27 21 39 04 28 04 57 05 39 15 29 19 02 23 31 8.0 1.2 14 2245-0835 MON JUL 13 19 16 19 58 20 27 22 24 04 28 04 58 05 40 15 33 19 06 23 35 8.0 1.9 24 2339-0415 TUE JUL 14 19 15 19 57 20 27 23 08 04 29 04 58 05 40 15 37 19 10 23 40 8.0 2.7 33 0033+0018 WED JUL 15 19 15 19 57 20 27 23 53 04 29 04 59 05 40 15 41 19 14 23 44 8.0 3.4 42 0127+0452 THU JUL 16 19 15 19 57 20 26 00 38 04 30 04 59 05 41 15 44 19 18 23 49 8.1 4.2 52 0221+0910 FRI JUL 17 19 15 19 57 20 26 01 26 04 30 05 00 05 41 15 48 19 22 23 53 8.1 5.0 61 0317+1256 SAT JUL 18 19 15 19 56 20 26 02 15 04 31 05 00 05 42 15 52 19 26 23 58 8.1 5.8 71 0414+1557 SUN JUL 19 19 14 19 56 20 25 03 08 04 31 05 00 05 42 15 54 19 30 00 02 8.1 6.7 82 0512+1800 MON JUL 20 19 14 19 56 20 25 04 03 16 54 04 32 05 01 05 42 15 58 19 34 00 07 8.1 7.6 94 0610+1857 TUE JUL 21 19 14 19 55 20 24 04 59 17 51 04 32 05 01 05 43 16 01 19 38 00 11 8.1 8.1 100 0708+1846 WED JUL 22 19 13 19 55 20 24 05 55 18 44 04 33 05 02 05 43 16 05 19 42 00 16 8.2 8.2 100 0804+1731 THU JUL 23 19 13 19 54 20 23 06 51 19 33 04 33 05 02 05 44 16 08 19 46 00 20 8.2 8.2 100 0858+1522 FRI JUL 24 19 13 19 54 20 23 07 45 20 19 04 34 05 03 05 44 16 12 19 50 00 25 8.2 8.2 100 0950+1229 SAT JUL 25 19 12 19 54 20 23 21 01 04 34 05 03 05 44 16 16 19 54 00 28 8.2 7.6 92 1039+0906 SUN JUL 26 19 12 19 53 20 22 21 40 04 35 05 04 05 45 16 19 19 58 00 33 8.2 6.9 84 1126+0523 MON JUL 27 19 12 19 53 20 21 22 18 04 35 05 04 05 45 16 22 20 02 00 37 8.2 6.3 76 1212+0131 TUE JUL 28 19 11 19 52 20 21 22 54 04 36 05 05 05 46 16 26 20 06 00 42 8.2 5.7 69 1258-0221 WED JUL 29 19 11 19 52 20 20 23 31 04 36 05 05 05 46 16 29 20 09 00 46 8.3 5.1 61 1343-0607 THU JUL 30 19 10 19 51 20 20 00 09 04 37 05 06 05 46 16 33 20 13 00 51 8.3 4.5 53 1428-0938 FRI JUL 31 19 10 19 51 20 19 00 48 04 38 05 06 05 47 16 36 20 17 00 56 8.3 3.8 46 1515-1247 ONE LINE REFERS TO EVENING DATE FIRST QUARTER JUL 01 18:46 UT AND FOLLOWING MORNING. FULL MOON JUL 09 16:03 UT All dates and times are zone HST LAST QUARTER JUL 16 15:16 UT in upper table (except sid time). NEW MOON JUL 23 13:45 UT FIRST QUARTER JUL 31 12:08 UT