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
 SAT AUG 01  19 10  19 50  20 18         01 30  04 38  05 06  05 47  16 39  20 21  01 00   8.3  3.1  37 1604-1527
 SUN AUG 02  19 09  19 50  20 18         02 15  04 39  05 07  05 47  16 43  20 25  01 05   8.4  2.4  28 1655-1727
 MON AUG 03  19 09  19 49  20 17         03 03  04 39  05 07  05 48  16 46  20 29  01 09   8.4  1.6  19 1748-1840
 TUE AUG 04  19 08  19 48  20 16  16 07  03 56  04 40  05 08  05 48  16 49  20 33  01 14   8.4  0.7   8 1842-1856
 WED AUG 05  19 07  19 48  20 16  17 00  04 51  04 40  05 08  05 48  16 52  20 37  01 18   8.4  0.0   0 1939-1811
 THU AUG 06  19 07  19 47  20 15  17 53  05 50  04 41  05 09  05 49  16 55  20 41  01 23   8.4  0.0   0 2035-1622
 FRI AUG 07  19 06  19 46  20 14  18 44  06 49  04 41  05 09  05 49  16 58  20 45  01 27   8.4  0.0   0 2132-1333
 SAT AUG 08  19 06  19 46  20 14  19 33  07 49  04 42  05 09  05 49  17 02  20 49  01 32   8.5  0.0   0 2229-0953
 SUN AUG 09  19 05  19 45  20 13  20 20         04 42  05 10  05 50  17 05  20 53  01 36   8.5  0.1   1 2324-0536
 MON AUG 10  19 04  19 44  20 12  21 06         04 43  05 10  05 50  17 08  20 57  01 41   8.5  0.9  10 0019-0058
 TUE AUG 11  19 04  19 44  20 11  21 52         04 43  05 11  05 50  17 11  21 01  01 45   8.5  1.7  19 0114+0341
 WED AUG 12  19 03  19 43  20 11  22 37         04 44  05 11  05 51  17 15  21 05  01 49   8.6  2.4  28 0209+0807
 THU AUG 13  19 03  19 42  20 10  23 24         04 44  05 12  05 51  17 18  21 09  01 53   8.6  3.2  37 0304+1203
 FRI AUG 14  19 02  19 41  20 09  00 13         04 44  05 12  05 51  17 21  21 13  01 57   8.6  4.1  47 0401+1515
 SAT AUG 15  19 01  19 41  20 08  01 04         04 45  05 12  05 52  17 24  21 17  02 02   8.6  4.9  57 0458+1731
 SUN AUG 16  19 00  19 40  20 07  01 57         04 45  05 13  05 52  17 27  21 20  02 06   8.6  5.8  67 0555+1844
 MON AUG 17  19 00  19 39  20 06  02 52         04 46  05 13  05 52  17 30  21 24  02 11   8.7  6.8  78 0652+1853
 TUE AUG 18  18 59  19 38  20 05  03 47  16 37  04 46  05 13  05 53  17 33  21 28  02 15   8.7  7.7  88 0748+1758
 WED AUG 19  18 58  19 37  20 05  04 42  17 27  04 47  05 14  05 53  17 37  21 32  02 20   8.7  8.6  99 0842+1606
 THU AUG 20  18 58  19 37  20 04  05 36  18 14  04 47  05 14  05 53  17 40  21 36  02 24   8.7  8.7 100 0933+1328
 FRI AUG 21  18 57  19 36  20 03  06 28  18 57  04 47  05 14  05 54  17 43  21 40  02 28   8.7  8.7 100 1023+1015
 SAT AUG 22  18 56  19 35  20 02  07 19  19 37  04 48  05 15  05 54  17 45  21 44  02 33   8.8  8.8 100 1111+0638
 SUN AUG 23  18 55  19 34  20 01         20 15  04 48  05 15  05 54  17 48  21 48  02 37   8.8  8.6  97 1158+0248
 MON AUG 24  18 54  19 33  20 00         20 52  04 49  05 15  05 54  17 51  21 52  02 42   8.8  7.9  90 1243-0104
 TUE AUG 25  18 54  19 32  19 59         21 29  04 49  05 16  05 55  17 54  21 56  02 46   8.8  7.3  83 1328-0453
 WED AUG 26  18 53  19 32  19 58         22 06  04 49  05 16  05 55  17 57  22 00  02 50   8.8  6.7  75 1414-0829
 THU AUG 27  18 52  19 31  19 57         22 44  04 50  05 16  05 55  18 00  22 04  02 55   8.9  6.1  68 1500-1146
 FRI AUG 28  18 51  19 30  19 56         23 24  04 50  05 17  05 55  18 03  22 08  02 59   8.9  5.4  61 1547-1435
 SAT AUG 29  18 50  19 29  19 55         00 07  04 51  05 17  05 56  18 06  22 12  03 03   8.9  4.7  52 1637-1648
 SUN AUG 30  18 49  19 28  19 54         00 53  04 51  05 17  05 56  18 09  22 16  03 07   9.0  4.0  44 1728-1817
 MON AUG 31  18 49  19 27  19 53         01 43  04 51  05 18  05 56  18 12  22 20  03 11   9.0  3.1  34 1821-1856

                ONE LINE REFERS TO EVENING DATE    FULL MOON      AUG 08   02:11  UT
                AND FOLLOWING MORNING.             LAST QUARTER   AUG 14   19:52  UT
                All dates and times are zone HST   NEW MOON       AUG 22   02:03  UT
                in upper table (except sid time).  FIRST QUARTER  AUG 30   05:09  UT