             o  ,    o  ,                                 MCMURDO STATION AQ                           Astronomical Applications Dept.
Location: E166 40, S77 51                               Civil Twilight for 2023                        U. S. Naval Observatory
                                                                                                       Washington, DC  20392-5420
                                                            Universal Time


       Jan.       Feb.       Mar.       Apr.       May        June       July       Aug.       Sept.      Oct.       Nov.       Dec.
Day Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End  Begin End
     h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m   h m  h m
01  //// ////  //// ////  //// ////  1830 0728  2204 0343  ==== ====  ==== ====  0045 0116  1931 0612  1525 0959  //// ////  //// ////
02  //// ////  //// ////  //// ////  1837 0721  2213 0335  ==== ====  ==== ====  0010 0151  1924 0618  1513 1010  //// ////  //// ////
02                                                                               2350
03  //// ////  //// ////  //// ////  1843 0713  2222 0325  ==== ====  ==== ====  2335 0211  1917 0625  1500 1022  //// ////  //// ////
04  //// ////  //// ////  //// ////  1850 0706  2232 0316  ==== ====  ==== ====  2321 0226  1910 0632  1447 1035  //// ////  //// ////
05  //// ////  //// ////  1339 1233  1857 0659  2242 0306  ==== ====  ==== ====  2309 0239  1902 0638  1432 1049  //// ////  //// ////
06  //// ////  //// ////  1413 1159  1904 0651  2253 0256  ==== ====  ==== ====  2258 0251  1855 0645  1415 1106  //// ////  //// ////
07  //// ////  //// ////  1434 1137  1911 0644  2305 0245  ==== ====  ==== ====  2247 0302  1848 0652  1355 1125  //// ////  //// ////
08  //// ////  //// ////  1452 1119  1917 0637  2318 0233  ==== ====  ==== ====  2238 0313  1841 0658  1327 1153  //// ////  //// ////
09  //// ////  //// ////  1507 1103  1924 0630  2332 0220  ==== ====  ==== ====  2228 0322  1833 0705  //// ////  //// ////  //// ////
10  //// ////  //// ////  1521 1049  1931 0622  2350 0206  ==== ====  ==== ====  2219 0332  1826 0711  //// ////  //// ////  //// ////
11  //// ////  //// ////  1533 1036  1938 0615       0148  ==== ====  ==== ====  2210 0340  1818 0718  //// ////  //// ////  //// ////
12  //// ////  //// ////  1545 1024  1944 0608  0015 0123  ==== ====  ==== ====  2201 0349  1811 0725  //// ////  //// ////  //// ////
13  //// ////  //// ////  1556 1013  1951 0601  ==== ====  ==== ====  ==== ====  2153 0357  1804 0732  //// ////  //// ////  //// ////
14  //// ////  //// ////  1606 1002  1958 0554  ==== ====  ==== ====  ==== ====  2145 0405  1756 0739  //// ////  //// ////  //// ////
15  //// ////  //// ////  1616 0951  2005 0546  ==== ====  ==== ====  ==== ====  2137 0413  1748 0746  //// ////  //// ////  //// ////
16  //// ////  //// ////  1625 0941  2011 0539  ==== ====  ==== ====  ==== ====  2129 0421  1741 0753  //// ////  //// ////  //// ////
17  //// ////  //// ////  1634 0932  2018 0532  ==== ====  ==== ====  ==== ====  2121 0429  1733 0800  //// ////  //// ////  //// ////
18  //// ////  //// ////  1643 0922  2025 0525  ==== ====  ==== ====  ==== ====  2113 0436  1725 0807  //// ////  //// ////  //// ////
19  //// ////  //// ////  1652 0913  2032 0517  ==== ====  ==== ====  ==== ====  2106 0443  1717 0815  //// ////  //// ////  //// ////
20  //// ////  //// ////  1700 0904  2039 0510  ==== ====  ==== ====  ==== ====  2058 0451  1709 0822  //// ////  //// ////  //// ////
21  //// ////  //// ////  1708 0856  2046 0502  ==== ====  ==== ====  ==== ====  2051 0458  1700 0830  //// ////  //// ////  //// ////
22  //// ////  //// ////  1716 0847  2054 0455  ==== ====  ==== ====  ==== ====  2043 0505  1652 0838  //// ////  //// ////  //// ////
23  //// ////  //// ////  1724 0839  2101 0447  ==== ====  ==== ====  ==== ====  2036 0512  1643 0846  //// ////  //// ////  //// ////
24  //// ////  //// ////  1732 0830  2108 0440  ==== ====  ==== ====  ==== ====  2029 0518  1634 0854  //// ////  //// ////  //// ////
25  //// ////  //// ////  1739 0822  2116 0432  ==== ====  ==== ====  ==== ====  2021 0525  1625 0902  //// ////  //// ////  //// ////
26  //// ////  //// ////  1747 0814  2123 0424  ==== ====  ==== ====  ==== ====  2014 0532  1616 0911  //// ////  //// ////  //// ////
27  //// ////  //// ////  1754 0806  2131 0416  ==== ====  ==== ====  ==== ====  2007 0539  1607 0919  //// ////  //// ////  //// ////
28  //// ////  //// ////  1801 0759  2139 0408  ==== ====  ==== ====  ==== ====  2000 0545  1557 0929  //// ////  //// ////  //// ////
29  //// ////             1808 0751  2147 0400  ==== ====  ==== ====  ==== ====  1953 0552  1547 0938  //// ////  //// ////  //// ////
30  //// ////             1816 0743  2156 0352  ==== ====  ==== ====  ==== ====  1945 0559  1536 0948  //// ////  //// ////  //// ////
31  //// ////             1823 0736             ==== ====             ==== ====  1938 0605             //// ////             //// ////

(//// Sun continuously above twilight limit)                                              (==== Sun continuously below twilight limit)

Add one hour for daylight time, if and when in use.