KECK OBSERVATORY CALENDAR FOR 2021 -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 2021 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 WED DEC 01 17 52 18 32 18 59 04 46 15 56 05 23 05 50 06 30 23 22 04 24 09 48 10.4 9.8 94 1448-1426 >90 THU DEC 02 17 53 18 33 19 00 05 53 16 43 05 23 05 50 06 30 23 27 04 28 09 52 10.4 10.4 100 1546-1934 >90 FRI DEC 03 17 53 18 33 19 00 17 36 05 24 05 51 06 31 23 31 04 32 09 57 10.4 10.4 100 1649-2329 >90 SAT DEC 04 17 53 18 33 19 00 18 36 05 24 05 51 06 32 23 35 04 36 10 01 10.4 10.4 100 1754-2546 >90 SUN DEC 05 17 53 18 33 19 00 19 41 05 25 05 52 06 32 23 39 04 40 10 06 10.4 9.7 93 1901-2612 >90 MON DEC 06 17 53 18 34 19 01 20 47 05 25 05 52 06 33 23 44 04 44 10 10 10.4 8.6 83 2005-2447 >90 TUE DEC 07 17 53 18 34 19 01 21 53 05 26 05 53 06 33 23 48 04 48 10 15 10.4 7.6 72 2106-2148 >90 WED DEC 08 17 54 18 34 19 01 22 55 05 27 05 54 06 34 23 52 04 52 10 19 10.4 6.5 62 2202-1738 >90 THU DEC 09 17 54 18 34 19 01 23 52 05 27 05 54 06 35 23 56 04 56 10 23 10.4 5.6 53 2253-1242 >90 FRI DEC 10 17 54 18 35 19 02 00 46 05 28 05 55 06 35 00 01 04 59 10 28 10.4 4.7 45 2342-0717 83 SAT DEC 11 17 55 18 35 19 02 01 37 05 28 05 55 06 36 00 05 05 03 10 32 10.4 3.9 36 0027-0147 71 SUN DEC 12 17 55 18 35 19 03 02 27 05 29 05 56 06 36 00 10 05 07 10 37 10.4 3.0 29 0112 0343 60 MON DEC 13 17 55 18 36 19 03 14 11 03 17 05 29 05 56 06 37 00 13 05 11 10 41 10.4 2.2 21 0156 0901 48 TUE DEC 14 17 56 18 36 19 03 14 45 04 07 05 30 05 57 06 38 00 17 05 15 10 46 10.5 1.4 13 0242 1355 37 WED DEC 15 17 56 18 37 19 04 15 20 04 59 05 30 05 58 06 38 00 22 05 19 10 50 10.4 0.5 4 0328 1816 26 THU DEC 16 17 56 18 37 19 04 15 58 05 51 05 31 05 58 06 39 00 26 05 23 10 55 10.4 0.0 0 0417 2151 16 FRI DEC 17 17 57 18 37 19 05 16 40 06 44 05 32 05 59 06 39 00 31 05 27 11 00 10.4 0.0 0 0508 2430 06 SAT DEC 18 17 57 18 38 19 05 17 25 05 32 05 59 06 40 00 35 05 31 11 04 10.4 0.0 0 0601 2603 09 SUN DEC 19 17 58 18 38 19 05 18 14 05 33 06 00 06 40 00 39 05 35 11 09 10.5 0.0 0 0655 2622 20 MON DEC 20 17 58 18 39 19 06 19 07 05 33 06 00 06 41 00 44 05 39 11 13 10.4 0.0 0 0749 2526 30 TUE DEC 21 17 59 18 39 19 06 20 01 05 34 06 01 06 41 00 48 05 43 11 18 10.5 0.9 8 0842 2316 42 WED DEC 22 17 59 18 40 19 07 20 55 05 34 06 01 06 42 00 53 05 47 11 22 10.4 1.8 17 0933 2001 53 THU DEC 23 18 00 18 40 19 07 21 50 05 35 06 02 06 42 00 57 05 51 11 27 10.5 2.7 25 1023 1549 64 FRI DEC 24 18 00 18 41 19 08 22 43 05 35 06 02 06 43 01 02 05 55 11 31 10.5 3.6 34 1111 1053 76 SAT DEC 25 18 01 18 41 19 08 23 37 05 36 06 03 06 43 01 06 05 59 11 36 10.5 4.5 42 1157 0519 88 SUN DEC 26 18 01 18 42 19 09 00 31 05 36 06 03 06 44 01 11 06 03 11 39 10.5 5.4 51 1246-0026 >90 MON DEC 27 18 02 18 42 19 10 01 27 05 36 06 04 06 44 01 16 06 06 11 43 10.4 6.3 60 1335-0624 >90 TUE DEC 28 18 02 18 43 19 10 02 27 05 37 06 04 06 44 01 20 06 10 11 48 10.5 7.3 69 1426-1214 >90 WED DEC 29 18 03 18 44 19 11 03 30 14 30 05 37 06 04 06 45 01 25 06 14 11 52 10.4 8.3 79 1522-1733 >90 THU DEC 30 18 04 18 44 19 11 04 36 15 19 05 38 06 05 06 45 01 29 06 18 11 57 10.5 9.4 90 1621-2157 >90 FRI DEC 31 18 04 18 45 19 12 05 45 16 14 05 38 06 05 06 46 01 33 06 22 12 01 10.4 10.4 100 1725-2456 >90 ONE LINE REFERS TO EVENING DATE NEW MOON Dec 04 07:44 UT AND FOLLOWING MORNING. FIRST QUARTER Dec 11 01:34 UT All dates and times are zone HST FULL MOON Dec 19 04:37 UT in upper table (except sid time). LAST QUARTER Dec 27 02:25 UT