KECK OBSERVATORY CALENDAR FOR 2023 -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 2023 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 SUN JAN 01 18 05 18 45 19 12 03 36 05 39 06 06 06 46 01 36 06 25 12 05 10.4 2.1 19 0312 1849 45 MON JAN 02 18 06 18 46 19 13 14 34 04 31 05 39 06 06 06 46 01 41 06 29 12 09 10.4 1.1 10 0403 2244 34 TUE JAN 03 18 06 18 47 19 14 15 17 05 26 05 39 06 06 06 47 01 46 06 33 12 13 10.4 0.2 2 0456 2535 23 WED JAN 04 18 07 18 47 19 14 16 04 06 20 05 40 06 07 06 47 01 50 06 37 12 18 10.4 0.0 0 0550 2712 13 THU JAN 05 18 07 18 48 19 15 16 54 05 40 06 07 06 47 01 55 06 41 12 22 10.4 0.0 0 0644 2729 08 FRI JAN 06 18 08 18 48 19 15 17 47 05 40 06 07 06 47 01 59 06 45 12 26 10.4 0.0 0 0738 2628 14 SAT JAN 07 18 09 18 49 19 16 18 40 05 41 06 07 06 48 02 04 06 49 12 31 10.4 0.0 0 0830 2414 24 SUN JAN 08 18 09 18 50 19 16 19 33 05 41 06 08 06 48 02 08 06 53 12 35 10.4 0.3 2 0920 2056 35 MON JAN 09 18 10 18 50 19 17 20 25 05 41 06 08 06 48 02 13 06 57 12 39 10.4 1.1 10 1008 1645 45 TUE JAN 10 18 11 18 51 19 18 21 16 05 41 06 08 06 48 02 18 07 01 12 43 10.4 2.0 18 1053 1155 56 WED JAN 11 18 11 18 51 19 18 22 06 05 42 06 08 06 48 02 22 07 05 12 48 10.4 2.8 26 1138 0637 67 THU JAN 12 18 12 18 52 19 19 22 56 05 42 06 09 06 49 02 27 07 09 12 52 10.4 3.6 34 1221 0059 79 FRI JAN 13 18 12 18 53 19 19 23 46 05 42 06 09 06 49 02 31 07 13 12 55 10.4 4.4 42 1304-0432 90 SAT JAN 14 18 13 18 53 19 20 00 38 05 42 06 09 06 49 02 36 07 16 12 59 10.4 5.3 51 1352-1025 >90 SUN JAN 15 18 14 18 54 19 20 01 34 05 42 06 09 06 49 02 40 07 20 13 03 10.4 6.2 60 1441-1549 >90 MON JAN 16 18 14 18 54 19 21 02 34 05 42 06 09 06 49 02 45 07 24 13 07 10.3 7.2 69 1535-2037 >90 TUE JAN 17 18 15 18 55 19 22 03 39 14 14 05 42 06 09 06 49 02 50 07 28 13 11 10.3 8.3 80 1633-2425 >90 WED JAN 18 18 16 18 55 19 22 04 46 15 09 05 43 06 09 06 49 02 53 07 32 13 16 10.3 9.4 90 1736-2646 >90 THU JAN 19 18 16 18 56 19 23 05 54 16 12 05 43 06 09 06 49 02 58 07 36 13 20 10.3 10.3 100 1843-2719 >90 FRI JAN 20 18 17 18 57 19 23 06 56 17 20 05 43 06 09 06 49 03 02 07 40 13 24 10.3 10.3 100 1950-2551 >90 SAT JAN 21 18 18 18 57 19 24 18 31 05 43 06 09 06 49 03 07 07 44 13 28 10.3 10.3 100 2054-2232 >90 SUN JAN 22 18 18 18 58 19 24 19 40 05 43 06 09 06 49 03 11 07 48 13 32 10.3 10.1 97 2155-1743 >90 MON JAN 23 18 19 18 58 19 25 20 45 05 43 06 09 06 49 03 16 07 52 13 36 10.3 9.0 87 2251-1155 >90 TUE JAN 24 18 19 18 59 19 25 21 47 05 43 06 09 06 49 03 20 07 56 13 40 10.3 7.9 77 2343-0535 >90 WED JAN 25 18 20 18 59 19 26 22 44 05 43 06 09 06 48 03 25 08 00 13 44 10.3 7.0 67 0033 0052 >90 THU JAN 26 18 21 19 00 19 26 23 41 05 43 06 09 06 48 03 29 08 04 13 48 10.3 6.0 58 0122 0705 >90 FRI JAN 27 18 21 19 01 19 27 00 36 05 42 06 09 06 48 03 34 08 08 13 51 10.2 5.1 49 0210 1245 85 SAT JAN 28 18 22 19 01 19 27 01 31 05 42 06 09 06 48 03 38 08 12 13 55 10.2 4.2 40 0259 1749 73 SUN JAN 29 18 22 19 02 19 28 02 26 05 42 06 08 06 48 03 43 08 16 13 59 10.2 3.3 31 0349 2158 62 MON JAN 30 18 23 19 02 19 28 03 21 05 42 06 08 06 47 03 47 08 20 14 03 10.2 2.3 22 0441 2504 50 TUE JAN 31 18 24 19 03 19 29 14 01 04 16 05 42 06 08 06 47 03 52 08 24 14 06 10.2 1.4 14 0535 2658 39 ONE LINE REFERS TO EVENING DATE FULL MOON Jan 06 23:08 UT AND FOLLOWING MORNING. LAST QUARTER Jan 15 02:13 UT All dates and times are zone HST NEW MOON Jan 21 20:52 UT in upper table (except sid time). FIRST QUARTER Jan 28 15:18 UT