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 THU MAY 01 18 55 19 35 20 03 23 43 04 35 05 03 05 42 10 23 14 20 18 56 8.5 4.9 57 0706 2657 >90 FRI MAY 02 18 56 19 36 20 03 00 34 04 34 05 02 05 42 10 27 14 24 18 59 8.5 4.0 46 0806 2410 86 SAT MAY 03 18 56 19 36 20 04 01 18 04 34 05 01 05 41 10 32 14 28 19 03 8.5 3.3 38 0900 2017 76 SUN MAY 04 18 56 19 36 20 04 01 56 04 33 05 01 05 41 10 36 14 32 19 06 8.5 2.6 30 0949 1529 67 MON MAY 05 18 57 19 37 20 05 02 30 04 32 05 00 05 40 10 40 14 36 19 09 8.4 2.0 24 1036 1007 59 TUE MAY 06 18 57 19 37 20 05 14 06 03 02 04 31 04 59 05 40 10 44 14 40 19 12 8.4 1.5 17 1120 0427 51 WED MAY 07 18 58 19 38 20 06 14 54 03 33 04 31 04 59 05 39 10 49 14 44 19 16 8.4 1.0 11 1202-0120 45 THU MAY 08 18 58 19 38 20 06 15 42 04 03 04 30 04 58 05 39 10 53 14 48 19 19 8.4 0.4 5 1245-0703 41 FRI MAY 09 18 58 19 39 20 07 16 30 04 36 04 29 04 58 05 38 10 58 14 52 19 22 8.4 0.0 0 1328-1231 38 SAT MAY 10 18 59 19 39 20 08 17 19 05 10 04 29 04 57 05 38 11 03 14 56 19 26 8.3 0.0 0 1413-1733 39 SUN MAY 11 18 59 19 40 20 08 18 10 05 48 04 28 04 57 05 37 11 07 15 00 19 29 8.3 0.0 0 1500-2157 42 MON MAY 12 19 00 19 40 20 09 19 03 06 30 04 28 04 56 05 37 11 12 15 04 19 32 8.3 0.0 0 1551-2528 47 TUE MAY 13 19 00 19 41 20 09 19 57 04 27 04 55 05 36 11 16 15 08 19 35 8.3 0.0 0 1644-2754 53 WED MAY 14 19 00 19 41 20 10 20 52 04 26 04 55 05 36 11 21 15 12 19 38 8.3 0.7 8 1739-2903 60 THU MAY 15 19 01 19 42 20 10 21 46 04 26 04 55 05 35 11 25 15 16 19 42 8.3 1.6 19 1836-2847 68 FRI MAY 16 19 01 19 42 20 11 22 36 04 25 04 54 05 35 11 30 15 20 19 45 8.2 2.4 29 1932-2700 77 SAT MAY 17 19 02 19 43 20 12 23 24 04 25 04 54 05 35 11 35 15 23 19 49 8.2 3.2 38 2026-2353 86 SUN MAY 18 19 02 19 43 20 12 00 07 04 24 04 53 05 34 11 39 15 27 19 52 8.2 3.9 47 2119-1940 >90 MON MAY 19 19 03 19 44 20 13 00 47 04 24 04 53 05 34 11 44 15 31 19 56 8.2 4.6 55 2210-1423 >90 TUE MAY 20 19 03 19 44 20 13 01 25 04 23 04 52 05 34 11 48 15 35 19 59 8.2 5.2 63 2259-0819 >90 WED MAY 21 19 03 19 45 20 14 02 02 04 23 04 52 05 33 11 53 15 39 20 03 8.1 5.8 71 2349-0144 >90 THU MAY 22 19 04 19 45 20 14 02 40 14 48 04 23 04 52 05 33 11 57 15 43 20 07 8.1 6.4 78 0039 0503 >90 FRI MAY 23 19 04 19 46 20 15 03 21 15 49 04 22 04 51 05 33 12 01 15 47 20 10 8.1 7.1 87 0132 1142 >90 SAT MAY 24 19 05 19 46 20 15 04 06 16 53 04 22 04 51 05 33 12 05 15 51 20 14 8.1 7.8 96 0228 1745 >90 SUN MAY 25 19 05 19 47 20 16 04 57 18 02 04 21 04 51 05 32 12 10 15 55 20 17 8.1 8.1 100 0328 2244 >90 MON MAY 26 19 06 19 47 20 17 05 54 19 12 04 21 04 50 05 32 12 15 15 59 20 21 8.1 8.1 100 0432 2610 >90 TUE MAY 27 19 06 19 48 20 17 06 58 20 22 04 21 04 50 05 32 12 19 16 03 20 25 8.1 8.0 98 0537 2743 >90 WED MAY 28 19 06 19 48 20 18 21 26 04 20 04 50 05 32 12 24 16 07 20 28 8.0 6.9 85 0642 2718 >90 THU MAY 29 19 07 19 49 20 18 22 23 04 20 04 50 05 32 12 28 16 11 20 31 8.0 6.0 74 0744 2505 >90 FRI MAY 30 19 07 19 49 20 19 23 12 04 20 04 49 05 31 12 33 16 15 20 35 8.0 5.1 64 0841 2126 >90 SAT MAY 31 19 08 19 50 20 19 23 53 04 20 04 49 05 31 12 37 16 19 20 39 8.0 4.5 55 0933 1646 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER May 04 13:52 UT AND FOLLOWING MORNING. FULL MOON May 12 16:58 UT All dates and times are zone HST LAST QUARTER May 20 12:01 UT in upper table (except sid time). NEW MOON May 27 03:03 UT