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 TUE APR 01 18 46 19 24 19 50 22 49 05 02 05 28 06 06 08 11 12 22 17 25 9.2 6.2 67 0419 2607 >90 WED APR 02 18 46 19 24 19 50 23 56 05 01 05 27 06 05 08 15 12 26 17 28 9.2 5.1 55 0522 2805 >90 THU APR 03 18 47 19 24 19 51 00 57 05 00 05 26 06 04 08 20 12 30 17 31 9.1 4.1 44 0625 2810 82 FRI APR 04 18 47 19 25 19 51 01 51 04 59 05 25 06 03 08 24 12 34 17 34 9.1 3.1 34 0725 2635 70 SAT APR 05 18 47 19 25 19 51 02 39 04 58 05 24 06 02 08 28 12 38 17 37 9.1 2.3 25 0822 2332 59 SUN APR 06 18 47 19 25 19 52 03 19 04 57 05 23 06 01 08 33 12 42 17 40 9.1 1.6 17 0914 1922 49 MON APR 07 18 48 19 26 19 52 14 27 03 56 04 56 05 22 06 00 08 37 12 46 17 43 9.1 1.0 11 1002 1424 39 TUE APR 08 18 48 19 26 19 52 15 19 04 29 04 55 05 21 06 00 08 41 12 50 17 46 9.0 0.4 4 1048 0855 31 WED APR 09 18 48 19 26 19 53 16 09 05 00 04 54 05 20 05 59 08 46 12 54 17 48 9.0 0.0 0 1132 0309 26 THU APR 10 18 48 19 27 19 53 16 57 05 30 04 53 05 20 05 58 08 50 12 58 17 51 9.0 0.0 0 1214-0241 25 FRI APR 11 18 49 19 27 19 53 17 45 06 01 04 52 05 19 05 57 08 54 13 02 17 54 9.0 0.0 0 1257-0825 28 SAT APR 12 18 49 19 27 19 54 18 33 06 34 04 51 05 18 05 56 08 59 13 05 17 57 9.0 0.0 0 1341-1349 35 SUN APR 13 18 49 19 28 19 54 19 23 04 50 05 17 05 55 09 03 13 09 18 00 8.9 0.0 0 1426-1844 43 MON APR 14 18 50 19 28 19 55 20 14 04 50 05 16 05 55 09 08 13 13 18 04 8.9 0.3 3 1514-2255 52 TUE APR 15 18 50 19 29 19 55 21 08 04 49 05 15 05 54 09 12 13 17 18 07 8.9 1.2 13 1605-2611 61 WED APR 16 18 50 19 29 19 56 22 02 04 48 05 14 05 53 09 17 13 21 18 10 8.9 2.1 23 1658-2818 71 THU APR 17 18 51 19 29 19 56 22 57 04 47 05 14 05 52 09 21 13 25 18 13 8.9 3.0 34 1754-2902 81 FRI APR 18 18 51 19 30 19 56 23 50 04 46 05 13 05 51 09 24 13 29 18 16 8.8 3.9 44 1846-2806 >90 SAT APR 19 18 51 19 30 19 57 00 40 04 45 05 12 05 51 09 29 13 33 18 19 8.8 4.7 53 1946-2624 >90 SUN APR 20 18 52 19 30 19 57 01 27 04 44 05 11 05 50 09 33 13 37 18 22 8.8 5.5 62 2041-2259 >90 MON APR 21 18 52 19 31 19 58 02 10 04 43 05 10 05 49 09 38 13 41 18 25 8.7 6.2 70 2133-1820 >90 TUE APR 22 18 52 19 31 19 58 02 50 14 05 04 42 05 09 05 49 09 42 13 45 18 28 8.7 6.9 78 2225-1239 >90 WED APR 23 18 53 19 32 19 59 03 29 15 04 04 42 05 09 05 48 09 47 13 49 18 32 8.7 7.5 86 2316-0612 >90 THU APR 24 18 53 19 32 19 59 04 08 16 03 04 41 05 08 05 47 09 51 13 53 18 35 8.7 8.1 93 0007 0043 >90 FRI APR 25 18 53 19 32 20 00 04 48 17 05 04 40 05 07 05 46 09 56 13 57 18 37 8.7 8.7 100 0059 0742 >90 SAT APR 26 18 54 19 33 20 00 05 31 18 09 04 39 05 06 05 46 10 00 14 01 18 40 8.7 8.7 100 0154 1420 >90 SUN APR 27 18 54 19 33 20 01 06 20 19 17 04 38 05 06 05 45 10 05 14 05 18 43 8.6 8.6 100 0252 2007 >90 MON APR 28 18 54 19 34 20 01 20 27 04 37 05 05 05 44 10 09 14 09 18 46 8.6 8.2 94 0354 2434 >90 TUE APR 29 18 55 19 34 20 02 21 37 04 37 05 04 05 44 10 14 14 12 18 50 8.6 7.0 81 0459 2717 >90 WED APR 30 18 55 19 35 20 02 22 43 04 36 05 03 05 43 10 18 14 16 18 53 8.6 5.9 68 0604 2803 >90 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Apr 05 02:15 UT AND FOLLOWING MORNING. FULL MOON Apr 13 00:22 UT All dates and times are zone HST LAST QUARTER Apr 21 01:38 UT in upper table (except sid time). NEW MOON Apr 27 19:30 UT