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 OCT 01 18 21 18 58 19 24 02 27 15 28 05 00 05 25 06 03 19 47 00 23 05 24 9.6 7.1 73 0929 1944 >90 SAT OCT 02 18 20 18 57 19 23 03 25 16 11 05 00 05 26 06 03 19 50 00 27 05 28 9.6 8.0 83 1021 1528 >90 SUN OCT 03 18 19 18 57 19 22 04 24 16 53 05 00 05 26 06 03 19 53 00 31 05 32 9.6 9.0 93 1112 1018 >90 MON OCT 04 18 18 18 56 19 21 05 22 17 32 05 00 05 26 06 04 19 56 00 35 05 36 9.6 9.6 100 1202 0430 >90 TUE OCT 05 18 17 18 55 19 20 06 21 18 11 05 01 05 26 06 04 19 58 00 39 05 41 9.7 9.7 100 1253-0142 >90 WED OCT 06 18 16 18 54 19 19 18 52 05 01 05 26 06 04 20 01 00 43 05 45 9.7 9.7 100 1345-0755 >90 THU OCT 07 18 16 18 53 19 19 19 35 05 01 05 27 06 04 20 05 00 47 05 49 9.7 9.4 97 1439-1349 >90 FRI OCT 08 18 15 18 52 19 18 20 21 05 01 05 27 06 05 20 08 00 51 05 53 9.7 8.7 89 1536-1858 >90 SAT OCT 09 18 14 18 52 19 17 21 12 05 02 05 27 06 05 20 11 00 55 05 58 9.8 7.8 80 1635-2259 >90 SUN OCT 10 18 13 18 51 19 16 22 08 05 02 05 27 06 05 20 14 00 59 06 02 9.8 6.9 70 1737-2533 >90 MON OCT 11 18 12 18 50 19 15 23 08 05 02 05 28 06 05 20 17 01 03 06 06 9.8 5.9 60 1840-2627 >90 TUE OCT 12 18 12 18 49 19 15 00 10 05 02 05 28 06 06 20 21 01 07 06 10 9.8 4.9 49 1945-2521 >90 WED OCT 13 18 11 18 48 19 14 01 12 05 03 05 28 06 06 20 24 01 11 06 15 9.8 3.9 39 2041-2320 79 THU OCT 14 18 10 18 48 19 13 14 27 02 11 05 03 05 29 06 06 20 27 01 15 06 19 9.8 2.9 29 2137-1949 66 FRI OCT 15 18 09 18 47 19 12 15 11 03 08 05 03 05 29 06 07 20 30 01 19 06 22 9.8 1.9 19 2230-1517 54 SAT OCT 16 18 08 18 46 19 12 15 50 04 02 05 04 05 29 06 07 20 34 01 23 06 27 9.9 1.0 10 2319-1008 43 SUN OCT 17 18 08 18 46 19 11 16 26 04 54 05 04 05 29 06 07 20 37 01 27 06 31 9.9 0.2 1 0006-0437 31 MON OCT 18 18 07 18 45 19 10 17 00 05 45 05 04 05 30 06 08 20 40 01 30 06 35 9.9 0.0 0 0052 0100 21 TUE OCT 19 18 06 18 44 19 10 17 34 06 35 05 04 05 30 06 08 20 44 01 34 06 39 9.9 0.0 0 0137 0630 13 WED OCT 20 18 06 18 43 19 09 18 08 05 05 05 30 06 08 20 47 01 38 06 44 9.9 0.0 0 0223 1140 13 THU OCT 21 18 05 18 43 19 08 18 43 05 05 05 31 06 09 20 50 01 42 06 48 10.0 0.0 0 0309 1618 21 FRI OCT 22 18 04 18 42 19 08 19 20 05 05 05 31 06 09 20 53 01 46 06 52 10.0 0.2 2 0358 2014 31 SAT OCT 23 18 04 18 42 19 07 20 01 05 06 05 31 06 09 20 56 01 50 06 57 10.0 0.9 9 0448 2317 41 SUN OCT 24 18 03 18 41 19 07 20 45 05 06 05 32 06 10 21 00 01 54 07 01 10.0 1.6 16 0539 2516 52 MON OCT 25 18 02 18 40 19 06 21 33 05 06 05 32 06 10 21 03 01 58 07 05 10.0 2.4 24 0632 2606 63 TUE OCT 26 18 02 18 40 19 06 22 25 05 07 05 32 06 10 21 07 02 02 07 10 10.0 3.3 33 0725 2543 74 WED OCT 27 18 01 18 39 19 05 23 18 05 07 05 33 06 11 21 10 02 06 07 14 10.0 4.2 42 0818 2404 85 THU OCT 28 18 00 18 39 19 05 00 14 05 07 05 33 06 11 21 14 02 10 07 18 10.0 5.1 51 0911 2120 >90 FRI OCT 29 18 00 18 38 19 04 01 10 14 05 05 08 05 33 06 12 21 17 02 14 07 23 10.1 6.1 60 1002 1729 >90 SAT OCT 30 17 59 18 38 19 04 02 07 14 45 05 08 05 34 06 12 21 21 02 18 07 27 10.1 7.0 70 1052 1242 >90 SUN OCT 31 17 59 18 37 19 03 03 04 15 25 05 08 05 34 06 13 21 24 02 22 07 31 10.1 8.0 79 1142 0711 >90 ONE LINE REFERS TO EVENING DATE NEW MOON Oct 06 11:04 UT AND FOLLOWING MORNING. FIRST QUARTER Oct 13 03:25 UT All dates and times are zone HST FULL MOON Oct 20 14:56 UT in upper table (except sid time). LAST QUARTER Oct 28 20:07 UT