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 FRI JAN 01 18 05 18 45 19 12 20 28 05 39 06 06 06 46 01 38 06 27 12 07 10.4 1.3 12 0944 1835 46 SAT JAN 02 18 06 18 46 19 13 21 26 05 39 06 06 06 46 01 43 06 31 12 11 10.4 2.2 21 1038 1411 59 SUN JAN 03 18 06 18 47 19 14 22 24 05 39 06 06 06 47 01 48 06 35 12 15 10.4 3.2 30 1130 0901 72 MON JAN 04 18 07 18 47 19 14 23 22 05 40 06 07 06 47 01 52 06 39 12 20 10.4 4.1 39 1220 0320 85 TUE JAN 05 18 07 18 48 19 15 00 19 05 40 06 07 06 47 01 57 06 43 12 24 10.4 5.1 48 1312-0229 >90 WED JAN 06 18 08 18 48 19 15 01 18 05 40 06 07 06 47 02 01 06 47 12 28 10.4 6.0 58 1403-0816 >90 THU JAN 07 18 09 18 49 19 16 02 18 05 41 06 07 06 48 02 06 06 51 12 33 10.4 7.0 67 1457-1339 >90 FRI JAN 08 18 09 18 50 19 16 03 21 14 18 05 41 06 08 06 48 02 10 06 55 12 37 10.4 8.1 77 1552-1818 >90 SAT JAN 09 18 10 18 50 19 17 04 25 15 08 05 41 06 08 06 48 02 15 06 59 12 41 10.4 9.1 87 1651-2154 >90 SUN JAN 10 18 11 18 51 19 18 05 29 16 02 05 41 06 08 06 48 02 20 07 03 12 45 10.4 10.2 98 1752-2407 >90 MON JAN 11 18 11 18 51 19 18 06 30 17 02 05 42 06 08 06 48 02 24 07 07 12 50 10.4 10.4 100 1854-2447 >90 TUE JAN 12 18 12 18 52 19 19 18 03 05 42 06 09 06 49 02 29 07 11 12 53 10.4 10.4 100 1954-2354 >90 WED JAN 13 18 12 18 53 19 19 19 04 05 42 06 09 06 49 02 33 07 14 12 57 10.4 10.4 100 2052-2138 >90 THU JAN 14 18 13 18 53 19 20 20 04 05 42 06 09 06 49 02 38 07 18 13 01 10.4 9.6 92 2147-1814 >90 FRI JAN 15 18 14 18 54 19 20 21 00 05 42 06 09 06 49 02 42 07 22 13 05 10.4 8.7 83 2237-1402 >90 SAT JAN 16 18 14 18 54 19 21 21 53 05 42 06 09 06 49 02 47 07 26 13 09 10.3 7.8 75 2325-0920 >90 SUN JAN 17 18 15 18 55 19 22 22 44 05 42 06 09 06 49 02 51 07 30 13 13 10.3 7.0 67 0010-0421 >90 MON JAN 18 18 16 18 55 19 22 23 33 05 43 06 09 06 49 02 55 07 34 13 18 10.3 6.2 59 0054 0043 >90 TUE JAN 19 18 16 18 56 19 23 00 22 05 43 06 09 06 49 03 00 07 38 13 22 10.3 5.4 51 0139 0535 88 WED JAN 20 18 17 18 57 19 23 01 10 05 43 06 09 06 49 03 04 07 42 13 26 10.3 4.6 44 0222 1025 77 THU JAN 21 18 18 18 57 19 24 02 00 05 43 06 09 06 49 03 09 07 46 13 30 10.3 3.7 36 0307 1448 66 FRI JAN 22 18 18 18 58 19 24 02 52 05 43 06 09 06 49 03 13 07 50 13 34 10.3 2.8 27 0354 1839 55 SAT JAN 23 18 19 18 58 19 25 03 45 05 43 06 09 06 49 03 18 07 54 13 38 10.3 2.0 19 0444 2146 44 SUN JAN 24 18 19 18 59 19 25 14 36 04 39 05 43 06 09 06 49 03 22 07 58 13 42 10.3 1.1 10 0538 2355 33 MON JAN 25 18 20 18 59 19 26 15 26 05 34 05 43 06 09 06 48 03 27 08 02 13 46 10.3 0.2 1 0634 2455 21 TUE JAN 26 18 21 19 00 19 26 16 20 06 28 05 43 06 09 06 48 03 31 08 06 13 50 10.3 0.0 0 0731 2435 09 WED JAN 27 18 21 19 01 19 27 17 17 05 42 06 09 06 48 03 36 08 10 13 53 10.2 0.0 0 0829 2250 05 THU JAN 28 18 22 19 01 19 27 18 17 05 42 06 09 06 48 03 40 08 14 13 57 10.2 0.0 0 0926 1945 17 FRI JAN 29 18 22 19 02 19 28 19 18 05 42 06 08 06 48 03 45 08 18 14 00 10.2 0.0 0 1022 1530 30 SAT JAN 30 18 23 19 02 19 28 20 17 05 42 06 08 06 47 03 49 08 21 14 04 10.2 0.8 7 1115 1021 43 SUN JAN 31 18 24 19 03 19 29 21 16 05 42 06 08 06 47 03 54 08 25 14 08 10.2 1.8 17 1208 0438 56 ONE LINE REFERS TO EVENING DATE LAST QUARTER Jan 06 09:37 UT AND FOLLOWING MORNING. NEW MOON Jan 13 05:00 UT All dates and times are zone HST FIRST QUARTER Jan 20 21:01 UT in upper table (except sid time). FULL MOON Jan 28 19:15 UT