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 SAT FEB 01 18 24 19 03 19 29 21 57 05 42 06 08 06 47 03 58 08 29 14 12 10.2 7.7 75 0015 0220 >90 SUN FEB 02 18 25 19 04 19 30 22 56 05 41 06 08 06 46 04 03 08 33 14 15 10.2 6.8 66 0106 0902 >90 MON FEB 03 18 25 19 04 19 30 23 57 05 41 06 07 06 46 04 07 08 37 14 19 10.2 5.7 56 0158 1516 >90 TUE FEB 04 18 26 19 05 19 31 01 00 05 41 06 07 06 46 04 12 08 41 14 23 10.2 4.7 46 0254 2039 80 WED FEB 05 18 26 19 05 19 31 02 04 05 41 06 07 06 45 04 16 08 45 14 27 10.2 3.6 35 0351 2453 67 THU FEB 06 18 27 19 06 19 32 03 08 05 40 06 06 06 45 04 20 08 49 14 30 10.1 2.5 24 0452 2737 54 FRI FEB 07 18 27 19 06 19 32 04 10 05 40 06 06 06 45 04 24 08 53 14 34 10.1 1.5 14 0554 2838 41 SAT FEB 08 18 28 19 07 19 32 14 43 05 06 05 40 06 06 06 44 04 28 08 57 14 38 10.1 0.6 5 0656 2752 29 SUN FEB 09 18 28 19 07 19 33 15 45 05 57 05 39 06 05 06 44 04 33 09 01 14 41 10.1 0.0 0 0755 2528 16 MON FEB 10 18 29 19 07 19 33 16 45 06 40 05 39 06 05 06 43 04 37 09 05 14 45 10.1 0.0 0 0851 2144 04 TUE FEB 11 18 29 19 08 19 34 17 43 05 39 06 04 06 43 04 42 09 09 14 49 10.1 0.0 0 0942 1659 08 WED FEB 12 18 30 19 08 19 34 18 37 05 38 06 04 06 42 04 46 09 13 14 52 10.1 0.0 0 1030 1134 20 THU FEB 13 18 30 19 09 19 35 19 29 05 38 06 04 06 42 04 51 09 17 14 56 10.0 0.0 0 1115 0547 32 FRI FEB 14 18 31 19 09 19 35 20 18 05 37 06 03 06 41 04 55 09 21 14 59 10.0 0.7 7 1159-0006 44 SAT FEB 15 18 31 19 10 19 35 21 06 05 37 06 03 06 41 04 59 09 25 15 03 10.0 1.5 15 1241-0554 55 SUN FEB 16 18 32 19 10 19 36 21 55 05 36 06 02 06 40 05 04 09 29 15 06 10.0 2.3 23 1325-1126 66 MON FEB 17 18 32 19 10 19 36 22 44 05 36 06 01 06 40 05 08 09 33 15 09 10.0 3.1 31 1409-1628 77 TUE FEB 18 18 33 19 11 19 36 23 35 05 35 06 01 06 39 05 12 09 37 15 12 10.0 4.0 39 1454-2050 88 WED FEB 19 18 33 19 11 19 37 00 28 05 35 06 00 06 38 05 17 09 40 15 16 10.0 4.8 48 1545-2435 >90 THU FEB 20 18 33 19 11 19 37 01 23 05 34 06 00 06 38 05 21 09 44 15 19 9.9 5.8 57 1637-2712 >90 FRI FEB 21 18 34 19 12 19 38 02 19 05 34 05 59 06 37 05 26 09 48 15 23 9.9 6.7 67 1732-2834 >90 SAT FEB 22 18 34 19 12 19 38 03 15 05 33 05 59 06 36 05 30 09 52 15 26 9.9 7.6 76 1829-2831 >90 SUN FEB 23 18 35 19 13 19 38 04 09 14 34 05 32 05 58 06 36 05 34 09 56 15 29 9.9 8.5 86 1927-2655 >90 MON FEB 24 18 35 19 13 19 39 04 59 15 35 05 32 05 57 06 35 05 38 10 00 15 33 9.9 9.3 94 2025-2346 >90 TUE FEB 25 18 35 19 13 19 39 05 45 16 38 05 31 05 57 06 34 05 42 10 04 15 36 9.9 9.9 100 2121-1913 >90 WED FEB 26 18 36 19 14 19 39 06 27 17 41 05 30 05 56 06 34 05 46 10 08 15 39 9.9 9.9 100 2214-1331 >90 THU FEB 27 18 36 19 14 19 40 18 42 05 30 05 55 06 33 05 51 10 12 15 43 9.8 9.8 100 2307-0701 >90 FRI FEB 28 18 37 19 14 19 40 19 43 05 29 05 55 06 32 05 55 10 16 15 46 9.8 9.8 99 2358-0004 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Feb 05 08:03 UT AND FOLLOWING MORNING. FULL MOON Feb 12 13:54 UT All dates and times are zone HST LAST QUARTER Feb 20 17:33 UT in upper table (except sid time). NEW MOON Feb 28 00:43 UT