KECK OBSERVATORY CALENDAR FOR 2025 -ASTRONOMICAL (computed for altitude 4160.0 m) ASTRONOMICAL(18 deg) TWILIGHT/DAWN MOON(midnight) DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (18 deg) Zenith 2025 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ RA DEC Dist 12 18 18 12 18 18 h h % h m d m deg WED JAN 01 18 05 18 45 19 12 20 09 05 39 06 06 06 46 01 38 06 27 12 07 10.4 9.5 90 2104-2029 >90 THU JAN 02 18 06 18 46 19 13 21 09 05 39 06 06 06 46 01 43 06 31 12 11 10.4 8.5 81 2158-1520 >90 FRI JAN 03 18 06 18 47 19 14 22 08 05 39 06 06 06 47 01 48 06 35 12 15 10.4 7.5 72 2248-0921 >90 SAT JAN 04 18 07 18 47 19 14 23 06 05 40 06 07 06 47 01 52 06 39 12 20 10.4 6.6 62 2338-0252 >90 SUN JAN 05 18 07 18 48 19 15 00 03 05 40 06 07 06 47 01 57 06 43 12 24 10.4 5.6 53 0033 0319 >90 MON JAN 06 18 08 18 48 19 15 01 02 05 40 06 07 06 47 02 01 06 47 12 28 10.4 4.6 44 0118 1021 79 TUE JAN 07 18 09 18 49 19 16 02 03 05 41 06 07 06 48 02 06 06 51 12 33 10.4 3.6 34 0211 1627 66 WED JAN 08 18 09 18 50 19 16 03 06 05 41 06 08 06 48 02 10 06 55 12 37 10.4 2.6 24 0307 2141 53 THU JAN 09 18 10 18 50 19 17 04 12 05 41 06 08 06 48 02 15 06 59 12 41 10.4 1.5 14 0407 2539 40 FRI JAN 10 18 11 18 51 19 18 14 53 05 17 05 41 06 08 06 48 02 20 07 03 12 45 10.4 0.4 3 0510 2801 27 SAT JAN 11 18 11 18 51 19 18 15 52 06 18 05 42 06 08 06 48 02 24 07 07 12 50 10.4 0.0 0 0614 2833 15 SUN JAN 12 18 12 18 52 19 19 16 54 05 42 06 09 06 49 02 29 07 11 12 54 10.4 0.0 0 0716 2715 08 MON JAN 13 18 12 18 53 19 19 17 57 05 42 06 09 06 49 02 33 07 15 12 58 10.4 0.0 0 0816 2421 15 TUE JAN 14 18 13 18 53 19 20 18 57 05 42 06 09 06 49 02 38 07 19 13 01 10.4 0.0 0 0910 2011 26 WED JAN 15 18 14 18 54 19 20 19 54 05 42 06 09 06 49 02 42 07 22 13 05 10.4 0.6 5 1001 1510 38 THU JAN 16 18 14 18 54 19 21 20 47 05 42 06 09 06 49 02 47 07 26 13 09 10.3 1.4 13 1048 0937 50 FRI JAN 17 18 15 18 55 19 22 21 38 05 42 06 09 06 49 02 52 07 30 13 13 10.3 2.3 21 1132 0351 61 SAT JAN 18 18 16 18 55 19 22 22 26 05 43 06 09 06 49 02 56 07 34 13 18 10.3 3.1 29 1214-0157 72 SUN JAN 19 18 16 18 56 19 23 23 14 05 43 06 09 06 49 03 00 07 38 13 22 10.3 3.9 37 1256-0732 83 MON JAN 20 18 17 18 57 19 23 00 02 05 43 06 09 06 49 03 04 07 42 13 26 10.3 4.7 45 1340-1254 >90 TUE JAN 21 18 18 18 57 19 24 00 52 05 43 06 09 06 49 03 09 07 46 13 30 10.3 5.5 52 1425-1745 >90 WED JAN 22 18 18 18 58 19 24 01 44 05 43 06 09 06 49 03 13 07 50 13 34 10.3 6.3 61 1512-2157 >90 THU JAN 23 18 19 18 58 19 25 02 39 05 43 06 09 06 49 03 18 07 54 13 38 10.3 7.2 70 1602-2518 >90 FRI JAN 24 18 19 18 59 19 25 03 36 14 03 05 43 06 09 06 49 03 22 07 58 13 42 10.3 8.2 79 1656-2732 >90 SAT JAN 25 18 20 18 59 19 26 04 33 14 54 05 43 06 09 06 48 03 27 08 02 13 46 10.3 9.1 88 1753-2827 >90 SUN JAN 26 18 21 19 00 19 26 05 29 15 51 05 43 06 09 06 48 03 31 08 06 13 50 10.3 10.1 97 1851-2750 >90 MON JAN 27 18 21 19 01 19 27 06 22 16 52 05 42 06 09 06 48 03 36 08 10 13 53 10.2 10.2 100 1950-2538 >90 TUE JAN 28 18 22 19 01 19 27 17 55 05 42 06 09 06 48 03 40 08 14 13 57 10.2 10.2 100 2047-2156 >90 WED JAN 29 18 22 19 02 19 28 18 57 05 42 06 08 06 48 03 45 08 18 14 01 10.2 10.2 100 2142-1658 >90 THU JAN 30 18 23 19 02 19 28 19 58 05 42 06 08 06 47 03 49 08 22 14 05 10.2 9.7 95 2234-1101 >90 FRI JAN 31 18 24 19 03 19 29 20 58 05 42 06 08 06 47 03 54 08 26 14 08 10.2 8.7 85 2325-0428 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Jan 06 23:56 UT AND FOLLOWING MORNING. FULL MOON Jan 13 22:28 UT All dates and times are zone HST LAST QUARTER Jan 21 20:31 UT in upper table (except sid time). NEW MOON Jan 29 12:35 UT