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 SEP 01 18 48 19 26 19 53 01 52 15 11 04 52 05 18 05 56 18 18 22 25 03 18 9.0 6.0 66 0707 2514 >90 THU SEP 02 18 47 19 25 19 52 02 47 16 02 04 52 05 18 05 57 18 20 22 29 03 22 9.0 6.9 76 0801 2402 >90 FRI SEP 03 18 46 19 24 19 51 03 45 16 51 04 52 05 19 05 57 18 23 22 33 03 26 9.0 7.9 87 0855 2135 >90 SAT SEP 04 18 45 19 23 19 50 04 43 17 36 04 53 05 19 05 57 18 26 22 37 03 31 9.0 8.9 98 0948 1759 >90 SUN SEP 05 18 44 19 22 19 49 05 41 18 19 04 53 05 19 05 57 18 29 22 41 03 35 9.1 9.1 100 1039 1323 >90 MON SEP 06 18 43 19 21 19 48 06 39 18 59 04 53 05 19 05 57 18 32 22 45 03 39 9.1 9.1 100 1130 0801 >90 TUE SEP 07 18 43 19 21 19 47 19 38 04 54 05 20 05 58 18 35 22 49 03 44 9.1 9.1 100 1220 0208 >90 WED SEP 08 18 42 19 20 19 46 20 17 04 54 05 20 05 58 18 38 22 53 03 48 9.1 8.6 94 1310-0357 >90 THU SEP 09 18 41 19 19 19 45 20 57 04 54 05 20 05 58 18 41 22 57 03 52 9.2 7.9 86 1402-0956 >90 FRI SEP 10 18 40 19 18 19 44 21 40 04 54 05 20 05 58 18 44 23 01 03 55 9.2 7.2 78 1455-1528 >90 SAT SEP 11 18 39 19 17 19 43 22 27 04 55 05 21 05 59 18 47 23 05 04 00 9.2 6.5 70 1551-2012 >90 SUN SEP 12 18 38 19 16 19 42 23 18 04 55 05 21 05 59 18 50 23 09 04 04 9.2 5.6 60 1651-2346 >90 MON SEP 13 18 37 19 15 19 41 00 14 04 55 05 21 05 59 18 53 23 12 04 08 9.2 4.7 50 1754-2539 90 TUE SEP 14 18 36 19 14 19 40 01 14 04 56 05 21 05 59 18 56 23 16 04 13 9.3 3.7 39 1855-2621 79 WED SEP 15 18 35 19 13 19 39 14 45 02 16 04 56 05 22 05 59 18 59 23 20 04 17 9.3 2.7 28 1956-2515 67 THU SEP 16 18 34 19 12 19 38 15 39 03 18 04 56 05 22 06 00 19 02 23 24 04 21 9.3 1.6 17 2055-2236 56 FRI SEP 17 18 33 19 11 19 37 16 28 04 17 04 56 05 22 06 00 19 05 23 28 04 25 9.3 0.7 6 2151-1842 45 SAT SEP 18 18 32 19 10 19 36 17 11 05 14 04 57 05 22 06 00 19 07 23 32 04 30 9.3 0.0 0 2244-1356 36 SUN SEP 19 18 32 19 09 19 35 17 50 06 08 04 57 05 23 06 00 19 10 23 36 04 34 9.4 0.0 0 2334-0835 28 MON SEP 20 18 31 19 08 19 34 18 26 04 57 05 23 06 00 19 13 23 40 04 38 9.4 0.0 0 0021-0258 25 TUE SEP 21 18 30 19 07 19 33 19 01 04 57 05 23 06 01 19 16 23 44 04 42 9.4 0.0 0 0107 0239 27 WED SEP 22 18 29 19 06 19 32 19 35 04 58 05 23 06 01 19 19 23 48 04 47 9.4 0.1 0 0153 0803 32 THU SEP 23 18 28 19 05 19 31 20 09 04 58 05 23 06 01 19 22 23 52 04 51 9.5 0.6 6 0238 1302 40 FRI SEP 24 18 27 19 05 19 30 20 45 04 58 05 24 06 01 19 25 23 56 04 55 9.5 1.2 13 0325 1724 50 SAT SEP 25 18 26 19 04 19 29 21 23 04 58 05 24 06 01 19 28 00 00 04 59 9.5 1.9 20 0414 2100 59 SUN SEP 26 18 25 19 03 19 28 22 05 04 59 05 24 06 02 19 31 00 04 05 04 9.5 2.6 27 0504 2341 69 MON SEP 27 18 24 19 02 19 27 22 51 04 59 05 24 06 02 19 34 00 08 05 08 9.5 3.4 35 0556 2517 79 TUE SEP 28 18 23 19 01 19 26 23 41 04 59 05 25 06 02 19 37 00 12 05 11 9.6 4.2 44 0647 2534 89 WED SEP 29 18 23 19 00 19 26 00 34 04 59 05 25 06 02 19 41 00 16 05 15 9.6 5.1 53 0743 2458 >90 THU SEP 30 18 22 18 59 19 25 01 30 14 42 05 00 05 25 06 03 19 44 00 20 05 20 9.6 6.1 63 0836 2256 >90 ONE LINE REFERS TO EVENING DATE NEW MOON Sep 07 00:50 UT AND FOLLOWING MORNING. FIRST QUARTER Sep 13 20:39 UT All dates and times are zone HST FULL MOON Sep 20 23:54 UT in upper table (except sid time). LAST QUARTER Sep 29 01:58 UT