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 MON DEC 01 17 52 18 32 18 59 14 47 04 24 05 23 05 50 06 30 23 22 04 24 09 48 10.4 1.0 9 0200 1626 34 TUE DEC 02 17 53 18 33 19 00 15 33 05 33 05 23 05 50 06 30 23 27 04 28 09 52 10.4 0.0 0 0301 2156 21 WED DEC 03 17 53 18 33 19 00 16 26 06 44 05 24 05 51 06 31 23 31 04 32 09 57 10.4 0.0 0 0406 2600 09 THU DEC 04 17 53 18 33 19 00 17 26 05 24 05 51 06 32 23 35 04 36 10 01 10.4 0.0 0 0515 2808 12 FRI DEC 05 17 53 18 33 19 00 18 33 05 25 05 52 06 32 23 39 04 40 10 06 10.4 0.0 0 0624 2805 25 SAT DEC 06 17 53 18 34 19 01 19 42 05 25 05 52 06 33 23 44 04 44 10 10 10.4 0.7 6 0731 2558 39 SUN DEC 07 17 53 18 34 19 01 20 49 05 26 05 53 06 33 23 48 04 48 10 15 10.4 1.8 17 0833 2210 52 MON DEC 08 17 54 18 34 19 01 21 52 05 27 05 54 06 34 23 52 04 52 10 20 10.4 2.9 27 0928 1713 65 TUE DEC 09 17 54 18 34 19 01 22 50 05 27 05 54 06 35 23 56 04 56 10 24 10.4 3.8 36 1019 1136 78 WED DEC 10 17 54 18 35 19 02 23 43 05 28 05 55 06 35 00 01 05 00 10 28 10.4 4.7 44 1104 0534 90 THU DEC 11 17 55 18 35 19 02 00 34 05 28 05 55 06 36 00 05 05 04 10 32 10.4 5.5 53 1150-0011 >90 FRI DEC 12 17 55 18 35 19 03 01 24 05 29 05 56 06 36 00 10 05 07 10 37 10.4 6.4 60 1233-0556 >90 SAT DEC 13 17 55 18 36 19 03 02 12 05 29 05 56 06 37 00 14 05 11 10 41 10.4 7.2 68 1316-1121 >90 SUN DEC 14 17 56 18 36 19 03 03 02 14 15 05 30 05 57 06 38 00 18 05 15 10 46 10.5 8.0 76 1401-1617 >90 MON DEC 15 17 56 18 37 19 04 03 53 14 50 05 30 05 58 06 38 00 22 05 19 10 50 10.4 8.8 84 1446-2035 >90 TUE DEC 16 17 56 18 37 19 04 04 46 15 29 05 31 05 58 06 39 00 26 05 23 10 55 10.4 9.7 92 1535-2404 >90 WED DEC 17 17 57 18 37 19 05 05 39 16 11 05 32 05 59 06 39 00 31 05 27 11 00 10.4 10.4 100 1625-2634 >90 THU DEC 18 17 57 18 38 19 05 06 33 16 58 05 32 05 59 06 40 00 35 05 31 11 04 10.4 10.4 100 1717-2754 >90 FRI DEC 19 17 58 18 38 19 05 17 50 05 33 06 00 06 40 00 39 05 35 11 09 10.5 10.5 100 1811-2758 >90 SAT DEC 20 17 58 18 39 19 06 18 44 05 33 06 00 06 41 00 44 05 39 11 13 10.4 10.4 100 1904-2643 >90 SUN DEC 21 17 59 18 39 19 06 19 39 05 34 06 01 06 41 00 48 05 43 11 18 10.5 9.9 94 1957-2412 >90 MON DEC 22 17 59 18 40 19 07 20 35 05 34 06 01 06 42 00 53 05 47 11 22 10.4 9.0 85 2048-2033 >90 TUE DEC 23 18 00 18 40 19 07 21 29 05 35 06 02 06 42 00 57 05 51 11 27 10.5 8.1 77 2136-1557 >90 WED DEC 24 18 00 18 41 19 08 22 23 05 35 06 02 06 43 01 02 05 55 11 31 10.5 7.2 68 2224-1034 >90 THU DEC 25 18 01 18 41 19 08 23 17 05 36 06 03 06 43 01 06 05 59 11 36 10.5 6.3 60 2311-0436 >90 FRI DEC 26 18 01 18 42 19 09 00 11 05 36 06 03 06 44 01 11 06 03 11 40 10.5 5.4 51 0000 0128 >90 SAT DEC 27 18 02 18 42 19 10 01 07 05 36 06 04 06 44 01 16 06 07 11 44 10.4 4.5 42 0047 0806 78 SUN DEC 28 18 02 18 43 19 10 02 07 05 37 06 04 06 44 01 20 06 11 11 48 10.5 3.5 33 0138 1420 65 MON DEC 29 18 03 18 44 19 11 03 12 05 37 06 04 06 45 01 25 06 14 11 52 10.4 2.4 23 0234 1958 51 TUE DEC 30 18 04 18 44 19 11 14 10 04 20 05 38 06 05 06 45 01 29 06 18 11 57 10.5 1.3 12 0336 2431 38 WED DEC 31 18 04 18 45 19 12 15 05 05 30 05 38 06 05 06 46 01 34 06 22 12 01 10.4 0.1 1 0442 2727 24 ONE LINE REFERS TO EVENING DATE FULL MOON Dec 04 23:15 UT AND FOLLOWING MORNING. LAST QUARTER Dec 11 20:51 UT All dates and times are zone HST NEW MOON Dec 20 01:45 UT in upper table (except sid time). FIRST QUARTER Dec 27 19:10 UT