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 FRI DEC 01 17 52 18 32 18 59 21 39 05 23 05 50 06 30 23 20 04 22 09 46 10.4 2.7 25 0855 2234 63 SAT DEC 02 17 53 18 33 19 00 22 32 05 23 05 50 06 30 23 25 04 26 09 50 10.4 3.5 34 0944 1830 74 SUN DEC 03 17 53 18 33 19 00 23 24 05 24 05 51 06 31 23 29 04 30 09 55 10.4 4.4 42 1029 1344 85 MON DEC 04 17 53 18 33 19 00 00 13 05 24 05 51 06 32 23 33 04 34 09 59 10.4 5.2 50 1113 0836 >90 TUE DEC 05 17 53 18 33 19 00 01 01 05 25 05 52 06 32 23 37 04 38 10 04 10.4 6.0 57 1155 0307 >90 WED DEC 06 17 53 18 34 19 01 01 49 05 25 05 52 06 33 23 42 04 42 10 08 10.4 6.8 65 1237-0231 >90 THU DEC 07 17 53 18 34 19 01 02 39 14 17 05 26 05 53 06 33 23 46 04 46 10 13 10.4 7.6 73 1320-0809 >90 FRI DEC 08 17 54 18 34 19 01 03 31 14 50 05 27 05 54 06 34 23 50 04 50 10 18 10.4 8.5 81 1406-1335 >90 SAT DEC 09 17 54 18 34 19 01 04 26 15 27 05 27 05 54 06 35 23 54 04 54 10 21 10.4 9.4 90 1454-1836 >90 SUN DEC 10 17 54 18 35 19 02 05 26 16 09 05 28 05 55 06 35 23 59 04 58 10 26 10.4 10.4 99 1547-2252 >90 MON DEC 11 17 55 18 35 19 02 06 28 16 57 05 28 05 55 06 36 00 03 05 01 10 30 10.4 10.4 100 1644-2604 >90 TUE DEC 12 17 55 18 35 19 03 17 52 05 29 05 56 06 36 00 08 05 05 10 35 10.4 10.4 100 1745-2748 >90 WED DEC 13 17 55 18 36 19 03 18 53 05 29 05 56 06 37 00 12 05 09 10 39 10.4 10.4 100 1848-2749 >90 THU DEC 14 17 56 18 36 19 03 19 58 05 30 05 57 06 38 00 15 05 13 10 44 10.5 9.5 91 1950-2602 >90 FRI DEC 15 17 56 18 37 19 04 21 04 05 30 05 58 06 38 00 20 05 17 10 48 10.4 8.4 80 2051-2236 >90 SAT DEC 16 17 56 18 37 19 04 22 09 05 31 05 58 06 39 00 24 05 21 10 53 10.4 7.4 70 2148-1748 >90 SUN DEC 17 17 57 18 37 19 05 23 10 05 32 05 59 06 39 00 29 05 25 10 58 10.4 6.4 60 2242-1201 >90 MON DEC 18 17 57 18 38 19 05 00 09 05 32 05 59 06 40 00 33 05 29 11 02 10.4 5.4 51 2336-0521 >90 TUE DEC 19 17 58 18 38 19 05 01 06 05 33 06 00 06 40 00 37 05 33 11 07 10.5 4.5 42 0023 0057 78 WED DEC 20 17 58 18 39 19 06 02 04 05 33 06 00 06 41 00 42 05 37 11 11 10.4 3.5 33 0112 0729 65 THU DEC 21 17 59 18 39 19 06 03 02 05 34 06 01 06 41 00 46 05 41 11 16 10.5 2.5 24 0203 1337 52 FRI DEC 22 17 59 18 40 19 07 14 18 04 01 05 34 06 01 06 42 00 51 05 45 11 20 10.4 1.5 14 0255 1902 40 SAT DEC 23 18 00 18 40 19 07 15 00 05 02 05 35 06 02 06 42 00 55 05 49 11 25 10.5 0.6 5 0351 2326 28 SUN DEC 24 18 00 18 41 19 08 15 47 06 03 05 35 06 02 06 43 01 00 05 53 11 29 10.5 0.0 0 0448 2631 16 MON DEC 25 18 01 18 41 19 08 16 39 05 36 06 03 06 43 01 04 05 57 11 34 10.5 0.0 0 0547 2805 09 TUE DEC 26 18 01 18 42 19 09 17 34 05 36 06 03 06 44 01 09 06 01 11 38 10.5 0.0 0 0646 2805 13 WED DEC 27 18 02 18 42 19 10 18 31 05 36 06 04 06 44 01 14 06 05 11 41 10.4 0.0 0 0743 2634 24 THU DEC 28 18 02 18 43 19 10 19 28 05 37 06 04 06 44 01 18 06 09 11 46 10.5 0.3 2 0836 2345 34 FRI DEC 29 18 03 18 44 19 11 20 23 05 37 06 04 06 45 01 23 06 12 11 50 10.4 1.2 11 0927 1955 46 SAT DEC 30 18 04 18 44 19 11 21 15 05 38 06 05 06 45 01 27 06 16 11 55 10.5 2.1 19 1014 1519 56 SUN DEC 31 18 04 18 45 19 12 22 05 05 38 06 05 06 46 01 32 06 20 11 59 10.4 2.9 27 1058 1012 67 ONE LINE REFERS TO EVENING DATE LAST QUARTER Dec 05 05:50 UT AND FOLLOWING MORNING. NEW MOON Dec 12 23:31 UT All dates and times are zone HST FIRST QUARTER Dec 19 18:39 UT in upper table (except sid time). FULL MOON Dec 27 00:33 UT