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 THU JUL 01 19 16 19 59 20 29 00 34 04 23 04 53 05 35 14 49 18 21 22 44 7.9 4.1 51 0112 0222 >90 FRI JUL 02 19 16 19 59 20 29 01 07 04 23 04 53 05 36 14 53 18 25 22 48 7.9 4.6 58 0155 0725 >90 SAT JUL 03 19 16 19 59 20 29 01 41 14 16 04 24 04 54 05 36 14 57 18 29 22 53 7.9 5.2 65 0239 1208 >90 SUN JUL 04 19 16 19 59 20 29 02 17 15 06 04 24 04 54 05 36 15 01 18 33 22 57 7.9 5.8 73 0325 1620 >90 MON JUL 05 19 16 19 59 20 28 02 56 15 57 04 24 04 54 05 37 15 04 18 37 23 01 7.9 6.5 81 0412 1953 >90 TUE JUL 06 19 16 19 58 20 28 03 39 16 50 04 25 04 55 05 37 15 08 18 40 23 06 7.9 7.2 90 0501 2237 >90 WED JUL 07 19 16 19 58 20 28 04 26 17 43 04 25 04 55 05 37 15 12 18 44 23 10 7.9 7.9 100 0552 2421 >90 THU JUL 08 19 16 19 58 20 28 05 17 18 36 04 26 04 56 05 38 15 16 18 48 23 15 8.0 8.0 100 0645 2458 >90 FRI JUL 09 19 16 19 58 20 28 06 12 19 27 04 26 04 56 05 38 15 20 18 52 23 19 8.0 8.0 100 0739 2421 >90 SAT JUL 10 19 16 19 58 20 28 20 16 04 27 04 56 05 39 15 24 18 56 23 24 8.0 8.0 100 0832 2230 >90 SUN JUL 11 19 16 19 58 20 28 21 02 04 27 04 57 05 39 15 28 19 00 23 28 8.0 7.4 92 0925 1930 >90 MON JUL 12 19 16 19 58 20 27 21 44 04 28 04 57 05 39 15 31 19 04 23 33 8.0 6.7 83 1016 1528 >90 TUE JUL 13 19 16 19 58 20 27 22 24 04 28 04 58 05 40 15 34 19 08 23 37 8.0 6.1 75 1106 1038 >90 WED JUL 14 19 15 19 57 20 27 23 02 04 29 04 58 05 40 15 38 19 12 23 42 8.0 5.5 67 1155 0511 >90 THU JUL 15 19 15 19 57 20 27 23 40 04 29 04 59 05 40 15 42 19 16 23 46 8.0 4.8 59 1244-0039 >90 FRI JUL 16 19 15 19 57 20 26 00 18 04 30 04 59 05 41 15 45 19 20 23 51 8.1 4.2 52 1336-0628 89 SAT JUL 17 19 15 19 57 20 26 01 00 04 30 05 00 05 41 15 49 19 24 23 55 8.1 3.5 43 1427-1220 80 SUN JUL 18 19 15 19 56 20 26 01 45 04 31 05 00 05 42 15 53 19 28 00 00 8.1 2.8 34 1522-1738 71 MON JUL 19 19 14 19 56 20 25 14 51 02 35 04 31 05 00 05 42 15 56 19 32 00 03 8.1 1.9 23 1621-2158 63 TUE JUL 20 19 14 19 56 20 25 15 56 03 31 04 32 05 01 05 42 16 00 19 36 00 08 8.1 1.0 12 1724-2458 55 WED JUL 21 19 14 19 55 20 24 17 02 04 33 04 32 05 01 05 43 16 03 19 40 00 12 8.1 0.0 0 1830-2617 49 THU JUL 22 19 14 19 55 20 24 18 05 05 37 04 33 05 02 05 43 16 07 19 44 00 17 8.2 0.0 0 1935-2548 46 FRI JUL 23 19 13 19 55 20 24 19 04 06 42 04 33 05 02 05 44 16 11 19 47 00 21 8.2 0.0 0 2038-2336 45 SAT JUL 24 19 13 19 54 20 23 19 55 04 34 05 03 05 44 16 14 19 51 00 26 8.2 0.0 0 2137-1959 48 SUN JUL 25 19 13 19 54 20 23 20 41 04 34 05 03 05 44 16 18 19 55 00 30 8.2 0.3 3 2232-1524 52 MON JUL 26 19 12 19 53 20 22 21 21 04 35 05 04 05 45 16 21 19 59 00 35 8.2 1.0 11 2323-1012 58 TUE JUL 27 19 12 19 53 20 21 21 58 04 35 05 04 05 45 16 24 20 03 00 39 8.2 1.6 19 0011-0444 66 WED JUL 28 19 11 19 52 20 21 22 32 04 36 05 05 05 46 16 28 20 07 00 44 8.2 2.2 26 0056 0044 73 THU JUL 29 19 11 19 52 20 20 23 06 04 37 05 05 05 46 16 31 20 11 00 49 8.3 2.8 33 0141 0559 81 FRI JUL 30 19 10 19 51 20 20 23 40 04 37 05 06 05 46 16 34 20 15 00 53 8.3 3.3 40 0224 1049 89 SAT JUL 31 19 10 19 51 20 19 00 15 04 38 05 06 05 47 16 37 20 19 00 58 8.3 3.9 47 0311 1522 >90 ONE LINE REFERS TO EVENING DATE LAST QUARTER Jul 01 21:12 UT AND FOLLOWING MORNING. NEW MOON Jul 10 01:18 UT All dates and times are zone HST FIRST QUARTER Jul 17 10:10 UT in upper table (except sid time). FULL MOON Jul 24 02:37 UT LAST QUARTER Jul 31 13:17 UT