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 OCT 01 18 21 18 58 19 24 19 56 05 00 05 25 06 03 19 45 00 22 05 22 9.6 0.5 5 0307 1931 39 MON OCT 02 18 20 18 57 19 23 20 41 05 00 05 26 06 03 19 48 00 25 05 26 9.6 1.3 13 0403 2348 50 TUE OCT 03 18 19 18 57 19 22 21 29 05 00 05 26 06 03 19 51 00 29 05 30 9.6 2.1 21 0500 2638 62 WED OCT 04 18 18 18 56 19 21 22 21 05 00 05 26 06 04 19 54 00 33 05 34 9.6 3.0 31 0558 2756 73 THU OCT 05 18 17 18 55 19 20 23 15 05 01 05 26 06 04 19 57 00 37 05 39 9.7 3.9 40 0654 2743 84 FRI OCT 06 18 16 18 54 19 19 00 11 05 01 05 26 06 04 20 00 00 41 05 43 9.7 4.9 50 0748 2614 >90 SAT OCT 07 18 16 18 53 19 19 01 05 14 21 05 01 05 27 06 04 20 03 00 45 05 47 9.7 5.8 59 0839 2331 >90 SUN OCT 08 18 15 18 52 19 18 01 58 15 02 05 01 05 27 06 05 20 06 00 49 05 51 9.7 6.7 68 0928 1951 >90 MON OCT 09 18 14 18 52 19 17 02 49 15 39 05 02 05 27 06 05 20 09 00 53 05 56 9.8 7.5 77 1013 1526 >90 TUE OCT 10 18 13 18 51 19 16 03 39 16 13 05 02 05 27 06 05 20 12 00 57 06 00 9.8 8.4 85 1057 1027 >90 WED OCT 11 18 12 18 50 19 15 04 28 16 45 05 02 05 28 06 05 20 15 01 01 06 04 9.8 9.2 94 1139 0503 >90 THU OCT 12 18 12 18 49 19 15 05 17 17 16 05 02 05 28 06 06 20 19 01 05 06 08 9.8 9.8 100 1221-0034 >90 FRI OCT 13 18 11 18 48 19 14 06 06 17 47 05 03 05 28 06 06 20 22 01 09 06 13 9.8 9.8 100 1304-0615 >90 SAT OCT 14 18 10 18 48 19 13 06 58 18 20 05 03 05 29 06 06 20 25 01 13 06 17 9.8 9.8 100 1348-1148 >90 SUN OCT 15 18 09 18 47 19 12 18 56 05 03 05 29 06 07 20 28 01 17 06 21 9.8 9.8 100 1435-1659 >90 MON OCT 16 18 08 18 46 19 12 19 36 05 04 05 29 06 07 20 32 01 21 06 26 9.9 9.5 95 1525-2133 >90 TUE OCT 17 18 08 18 46 19 11 20 21 05 04 05 29 06 07 20 35 01 25 06 29 9.9 8.7 88 1619-2511 >90 WED OCT 18 18 07 18 45 19 10 21 12 05 04 05 30 06 08 20 38 01 29 06 33 9.9 7.9 79 1716-2735 >90 THU OCT 19 18 06 18 44 19 10 22 09 05 04 05 30 06 08 20 42 01 33 06 37 9.9 6.9 69 1817-2828 >90 FRI OCT 20 18 06 18 43 19 09 23 11 05 05 05 30 06 08 20 45 01 36 06 42 9.9 5.9 59 1918-2739 >90 SAT OCT 21 18 05 18 43 19 08 00 15 05 05 05 31 06 09 20 48 01 40 06 46 10.0 4.8 48 2022-2454 90 SUN OCT 22 18 04 18 42 19 08 01 20 05 05 05 31 06 09 20 52 01 44 06 50 10.0 3.8 37 2119-2059 77 MON OCT 23 18 04 18 42 19 07 14 25 02 22 05 06 05 31 06 09 20 54 01 48 06 55 10.0 2.7 27 2215-1538 63 TUE OCT 24 18 03 18 41 19 07 15 08 03 24 05 06 05 32 06 10 20 58 01 52 06 59 10.0 1.7 17 2309-0918 50 WED OCT 25 18 02 18 40 19 06 15 48 04 24 05 06 05 32 06 10 21 01 01 56 07 03 10.0 0.7 6 0002-0225 36 THU OCT 26 18 02 18 40 19 06 16 26 05 24 05 07 05 32 06 10 21 05 02 00 07 08 10.0 0.0 0 0054 0435 22 FRI OCT 27 18 01 18 39 19 05 17 05 06 25 05 07 05 33 06 11 21 08 02 04 07 12 10.0 0.0 0 0147 1118 09 SAT OCT 28 18 00 18 39 19 05 17 46 05 07 05 33 06 11 21 12 02 08 07 16 10.0 0.0 0 0241 1719 08 SUN OCT 29 18 00 18 38 19 04 18 29 05 08 05 33 06 12 21 15 02 12 07 21 10.1 0.0 0 0338 2215 20 MON OCT 30 17 59 18 38 19 04 19 17 05 08 05 34 06 12 21 19 02 16 07 25 10.1 0.2 2 0436 2548 33 TUE OCT 31 17 59 18 37 19 03 20 09 05 08 05 34 06 13 21 22 02 20 07 29 10.1 1.1 10 0535 2748 45 ONE LINE REFERS TO EVENING DATE LAST QUARTER Oct 06 13:48 UT AND FOLLOWING MORNING. NEW MOON Oct 14 17:55 UT All dates and times are zone HST FIRST QUARTER Oct 22 03:28 UT in upper table (except sid time). FULL MOON Oct 28 20:25 UT