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 OCT 01 18 21 18 58 19 24 14 25 02 02 05 00 05 25 06 03 19 47 00 24 05 24 9.6 3.0 30 2041-2212 69 THU OCT 02 18 20 18 57 19 23 15 09 03 00 05 00 05 26 06 03 19 50 00 28 05 28 9.6 2.0 20 2134-1722 57 FRI OCT 03 18 19 18 57 19 22 15 49 03 58 05 00 05 26 06 03 19 53 00 31 05 32 9.6 1.0 10 2226-1130 44 SAT OCT 04 18 18 18 56 19 21 16 28 04 57 05 00 05 26 06 04 19 56 00 35 05 36 9.6 0.1 0 2317-0452 31 SUN OCT 05 18 17 18 55 19 20 17 06 05 57 05 01 05 26 06 04 19 59 00 39 05 41 9.7 0.0 0 0009 0211 19 MON OCT 06 18 16 18 54 19 19 17 45 05 01 05 26 06 04 20 02 00 43 05 45 9.7 0.0 0 0103 0916 12 TUE OCT 07 18 16 18 53 19 19 18 27 05 01 05 27 06 04 20 05 00 47 05 49 9.7 0.0 0 0159 1552 18 WED OCT 08 18 15 18 52 19 18 19 13 05 01 05 27 06 05 20 08 00 51 05 53 9.7 0.0 0 0259 2129 30 THU OCT 09 18 14 18 52 19 17 20 05 05 02 05 27 06 05 20 11 00 55 05 58 9.8 0.8 8 0402 2539 43 FRI OCT 10 18 13 18 51 19 16 21 02 05 02 05 27 06 05 20 14 00 59 06 02 9.8 1.8 18 0507 2758 57 SAT OCT 11 18 12 18 50 19 15 22 05 05 02 05 28 06 05 20 17 01 03 06 06 9.8 2.8 28 0613 2817 70 SUN OCT 12 18 12 18 49 19 15 23 09 05 02 05 28 06 06 20 21 01 07 06 10 9.8 3.9 39 0715 2643 83 MON OCT 13 18 11 18 48 19 14 00 12 05 03 05 28 06 06 20 24 01 11 06 15 9.8 5.0 50 0814 2340 >90 TUE OCT 14 18 10 18 48 19 13 01 12 14 13 05 03 05 29 06 06 20 27 01 15 06 19 9.8 6.0 60 0908 1925 >90 WED OCT 15 18 09 18 47 19 12 02 09 14 54 05 03 05 29 06 07 20 30 01 19 06 23 9.8 6.9 70 0957 1422 >90 THU OCT 16 18 08 18 46 19 12 03 01 15 29 05 04 05 29 06 07 20 34 01 23 06 28 9.9 7.8 79 1044 0850 >90 FRI OCT 17 18 08 18 46 19 11 03 52 16 03 05 04 05 29 06 07 20 37 01 27 06 32 9.9 8.7 87 1127 0304 >90 SAT OCT 18 18 07 18 45 19 10 04 41 16 35 05 04 05 30 06 08 20 40 01 31 06 35 9.9 9.5 96 1210-0243 >90 SUN OCT 19 18 06 18 44 19 10 05 30 17 06 05 04 05 30 06 08 20 44 01 35 06 39 9.9 9.9 100 1253-0820 >90 MON OCT 20 18 06 18 43 19 09 06 20 17 38 05 05 05 30 06 08 20 47 01 38 06 44 9.9 9.9 100 1336-1337 >90 TUE OCT 21 18 05 18 43 19 08 18 13 05 05 05 31 06 09 20 50 01 42 06 48 10.0 10.0 100 1421-1822 >90 WED OCT 22 18 04 18 42 19 08 18 50 05 05 05 31 06 09 20 54 01 46 06 52 10.0 10.0 100 1507-2224 >90 THU OCT 23 18 04 18 42 19 07 19 31 05 06 05 31 06 09 20 57 01 50 06 57 10.0 9.6 95 1557-2533 >90 FRI OCT 24 18 03 18 41 19 07 20 16 05 06 05 32 06 10 21 00 01 54 07 01 10.0 8.8 88 1648-2737 >90 SAT OCT 25 18 02 18 40 19 06 21 06 05 06 05 32 06 10 21 03 01 58 07 05 10.0 8.0 79 1741-2829 >90 SUN OCT 26 18 02 18 40 19 06 21 59 05 07 05 32 06 10 21 07 02 02 07 10 10.0 7.1 71 1835-2803 >90 MON OCT 27 18 01 18 39 19 05 22 54 05 07 05 33 06 11 21 10 02 06 07 14 10.0 6.2 61 1929-2617 >90 TUE OCT 28 18 00 18 39 19 05 23 50 05 07 05 33 06 11 21 14 02 10 07 18 10.0 5.3 52 2021-2314 >90 WED OCT 29 18 00 18 38 19 04 00 46 05 08 05 33 06 12 21 17 02 14 07 23 10.1 4.4 43 2114-1857 83 THU OCT 30 17 59 18 38 19 04 01 42 05 08 05 34 06 12 21 21 02 18 07 27 10.1 3.4 34 2204-1345 71 FRI OCT 31 17 59 18 37 19 03 14 21 02 39 05 08 05 34 06 13 21 24 02 22 07 31 10.1 2.5 24 2254-0737 58 ONE LINE REFERS TO EVENING DATE FULL MOON Oct 07 03:47 UT AND FOLLOWING MORNING. LAST QUARTER Oct 13 18:12 UT All dates and times are zone HST NEW MOON Oct 21 12:23 UT in upper table (except sid time). FIRST QUARTER Oct 29 16:21 UT