KECK OBSERVATORY CALENDAR FOR 2025 -NAUTICAL (computed for altitude 4160.0 m) NAUTICAL(12 deg) TWILIGHT/DAWN MOON(midnight) DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (12 deg) Zenith 2025 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ RA DEC Dist 12 18 18 12 12 12 h h % h m d m deg FRI AUG 01 19 10 19 50 20 19 00 19 04 38 05 06 05 47 16 12 20 23 01 30 9.3 4.8 51 1503-2218 89 SAT AUG 02 19 09 19 50 20 18 01 01 04 39 05 07 05 47 16 16 20 27 01 35 9.3 4.1 44 1552-2547 81 SUN AUG 03 19 09 19 49 20 17 14 28 01 48 04 39 05 07 05 48 16 19 20 31 01 39 9.3 3.3 35 1645-2809 73 MON AUG 04 19 08 19 48 20 17 15 23 02 40 04 40 05 08 05 48 16 22 20 35 01 44 9.3 2.5 26 1741-2908 65 TUE AUG 05 19 07 19 48 20 16 16 17 03 36 04 40 05 08 05 48 16 26 20 39 01 48 9.3 1.5 16 1838-2840 57 WED AUG 06 19 07 19 47 20 15 17 10 04 35 04 41 05 09 05 49 16 29 20 43 01 53 9.4 0.6 6 1936-2641 49 THU AUG 07 19 06 19 46 20 14 17 58 05 34 04 41 05 09 05 49 16 32 20 47 01 57 9.4 0.0 0 2032-2314 43 FRI AUG 08 19 06 19 46 20 14 18 43 06 33 04 42 05 09 05 50 16 36 20 51 02 01 9.4 0.0 0 2126-1830 39 SAT AUG 09 19 05 19 45 20 13 19 23 04 42 05 10 05 50 16 39 20 55 02 05 9.4 0.0 0 2219-1245 39 SUN AUG 10 19 05 19 44 20 12 20 02 04 43 05 10 05 50 16 42 20 59 02 09 9.4 0.3 3 2309-0619 41 MON AUG 11 19 04 19 44 20 11 20 39 04 43 05 11 05 51 16 46 21 03 02 14 9.4 0.9 9 2400 0028 47 TUE AUG 12 19 03 19 43 20 11 21 16 04 44 05 11 05 51 16 49 21 06 02 18 9.5 1.5 16 0050 0714 56 WED AUG 13 19 03 19 42 20 10 21 55 04 44 05 12 05 51 16 52 21 10 02 23 9.5 2.2 23 0142 1337 65 THU AUG 14 19 02 19 41 20 09 22 37 04 44 05 12 05 51 16 55 21 14 02 27 9.5 2.9 30 0237 1914 75 FRI AUG 15 19 01 19 41 20 08 23 24 04 45 05 12 05 52 16 59 21 18 02 31 9.5 3.7 39 0335 2341 86 SAT AUG 16 19 01 19 40 20 07 00 18 04 45 05 13 05 52 17 02 21 22 02 36 9.6 4.6 48 0436 2645 >90 SUN AUG 17 19 00 19 39 20 06 01 16 14 42 04 46 05 13 05 52 17 04 21 26 02 40 9.6 5.6 58 0539 2801 >90 MON AUG 18 18 59 19 38 20 06 02 19 15 44 04 46 05 13 05 53 17 07 21 30 02 44 9.6 6.7 69 0642 2728 >90 TUE AUG 19 18 58 19 37 20 05 03 24 16 41 04 47 05 14 05 53 17 10 21 34 02 49 9.6 7.8 80 0742 2514 >90 WED AUG 20 18 58 19 37 20 04 04 26 17 31 04 47 05 14 05 53 17 14 21 38 02 53 9.6 8.8 91 0838 2134 >90 THU AUG 21 18 57 19 36 20 03 05 25 18 15 04 48 05 15 05 54 17 17 21 42 02 58 9.6 9.6 100 0931 1652 >90 FRI AUG 22 18 56 19 35 20 02 06 20 18 53 04 48 05 15 05 54 17 20 21 46 03 02 9.7 9.7 100 1019 1127 >90 SAT AUG 23 18 55 19 34 20 01 19 28 04 48 05 15 05 54 17 23 21 50 03 06 9.7 9.7 100 1105 0539 >90 SUN AUG 24 18 54 19 33 20 00 20 01 04 49 05 16 05 54 17 26 21 54 03 11 9.7 9.3 95 1149-0016 >90 MON AUG 25 18 54 19 32 19 59 20 33 04 49 05 16 05 55 17 29 21 58 03 15 9.7 8.7 89 1232-0605 >90 TUE AUG 26 18 53 19 32 19 58 21 05 04 49 05 16 05 55 17 33 22 02 03 19 9.7 8.2 84 1315-1136 >90 WED AUG 27 18 52 19 31 19 57 21 39 04 50 05 16 05 55 17 36 22 06 03 22 9.8 7.6 78 1359-1640 >90 THU AUG 28 18 51 19 30 19 56 22 15 04 50 05 17 05 55 17 39 22 10 03 27 9.8 7.0 71 1445-2106 >90 FRI AUG 29 18 50 19 29 19 55 22 55 04 51 05 17 05 56 17 42 22 13 03 31 9.8 6.4 64 1534-2445 >90 SAT AUG 30 18 50 19 28 19 54 23 40 04 51 05 17 05 56 17 45 22 17 03 35 9.8 5.6 57 1626-2723 >90 SUN AUG 31 18 49 19 27 19 53 00 29 04 51 05 18 05 56 17 48 22 21 03 40 9.8 4.8 48 1721-2843 88 ONE LINE REFERS TO EVENING DATE FIRST QUARTER Aug 01 12:42 UT AND FOLLOWING MORNING. FULL MOON Aug 09 07:54 UT All dates and times are zone HST LAST QUARTER Aug 16 05:13 UT in upper table (except sid time). NEW MOON Aug 23 06:04 UT FIRST QUARTER Aug 31 06:25 UT