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
 SUN FEB 01  18 24  19 03  19 29         23 20  05 42  06 08  06 47  03 56  08 28  14 11  10.2  6.4  62 0135+0605
 MON FEB 02  18 25  19 04  19 30         00 19  05 41  06 08  06 46  04 01  08 32  14 14  10.2  5.4  52 0230+1008
 TUE FEB 03  18 25  19 04  19 30         01 18  05 41  06 07  06 46  04 05  08 36  14 18  10.2  4.4  43 0325+1333
 WED FEB 04  18 26  19 05  19 31         02 16  05 41  06 07  06 46  04 10  08 40  14 21  10.2  3.4  33 0420+1610
 THU FEB 05  18 26  19 05  19 31         03 12  05 41  06 07  06 45  04 14  08 43  14 25  10.2  2.5  24 0516+1751
 FRI FEB 06  18 27  19 06  19 32         04 07  05 40  06 06  06 45  04 19  08 47  14 28  10.1  1.5  15 0611+1833
 SAT FEB 07  18 27  19 06  19 32         04 58  05 40  06 06  06 45  04 23  08 51  14 32  10.1  0.7   6 0706+1814
 SUN FEB 08  18 28  19 06  19 32  16 08  05 47  05 40  06 06  06 44  04 27  08 55  14 36  10.1  0.0   0 0759+1700
 MON FEB 09  18 28  19 07  19 33  17 01  06 32  05 39  06 05  06 44  04 32  08 59  14 39  10.1  0.0   0 0850+1458
 TUE FEB 10  18 29  19 07  19 33  17 53  07 14  05 39  06 05  06 43  04 35  09 03  14 43  10.1  0.0   0 0940+1216
 WED FEB 11  18 29  19 08  19 34  18 44  07 54  05 39  06 04  06 43  04 40  09 07  14 47  10.1  0.0   0 1028+0904
 THU FEB 12  18 30  19 08  19 34  19 34         05 38  06 04  06 42  04 44  09 11  14 50  10.1  0.0   0 1114+0532
 FRI FEB 13  18 30  19 09  19 35  20 22         05 38  06 03  06 42  04 49  09 15  14 54  10.0  0.8   7 1200+0149
 SAT FEB 14  18 31  19 09  19 35  21 10         05 37  06 03  06 41  04 53  09 19  14 57  10.0  1.6  15 1245-0156
 SUN FEB 15  18 31  19 10  19 35  21 58         05 37  06 02  06 41  04 57  09 23  15 01  10.0  2.4  23 1330-0536
 MON FEB 16  18 32  19 10  19 36  22 47         05 36  06 02  06 40  05 02  09 27  15 04  10.0  3.2  31 1416-0904
 TUE FEB 17  18 32  19 10  19 36  23 36         05 36  06 01  06 40  05 06  09 31  15 08  10.0  4.0  40 1503-1212
 WED FEB 18  18 33  19 11  19 36  00 26         05 35  06 01  06 39  05 10  09 35  15 11  10.0  4.8  48 1551-1452
 THU FEB 19  18 33  19 11  19 37  01 18         05 35  06 00  06 38  05 15  09 39  15 15  10.0  5.7  57 1642-1654
 FRI FEB 20  18 33  19 11  19 37  02 11         05 34  06 00  06 38  05 19  09 43  15 18   9.9  6.6  65 1735-1810
 SAT FEB 21  18 34  19 12  19 37  03 05         05 33  05 59  06 37  05 23  09 47  15 20   9.9  7.5  75 1831-1830
 SUN FEB 22  18 34  19 12  19 38  03 59         05 33  05 59  06 36  05 28  09 50  15 24   9.9  8.4  84 1928-1748
 MON FEB 23  18 35  19 13  19 38  04 53         05 32  05 58  06 36  05 32  09 54  15 27   9.9  9.2  93 2027-1559
 TUE FEB 24  18 35  19 13  19 39  05 45  16 56  05 32  05 57  06 35  05 37  09 58  15 31   9.9  9.9 100 2126-1307
 WED FEB 25  18 35  19 13  19 39  06 36  17 58  05 31  05 57  06 34  05 41  10 02  15 34   9.9  9.9 100 2224-0920
 THU FEB 26  18 36  19 14  19 39  07 25  19 01  05 30  05 56  06 34  05 45  10 06  15 37   9.9  9.9 100 2322-0455
 FRI FEB 27  18 36  19 14  19 40         20 04  05 30  05 55  06 33  05 49  10 10  15 41   9.8  9.4  95 0020-0010
 SAT FEB 28  18 37  19 14  19 40         21 07  05 29  05 55  06 32  05 53  10 14  15 44   9.8  8.4  85 0117+0432

                ONE LINE REFERS TO EVENING DATE    FIRST QUARTER  FEB 03   22:57  UT
                AND FOLLOWING MORNING.             FULL MOON      FEB 11   10:26  UT
                All dates and times are zone HST   LAST QUARTER   FEB 19   15:31  UT
                in upper table (except sid time).  NEW MOON       FEB 26   17:27  UT