Understanding >Astronomical calculations
2025.-CALENDAR-. JANUARY FEBRUARY MARCH ------------------------------ ------------------------------ ------------------------------ DAY DAY & NO DAY DAY & NO DAY DAY & NO ------------------- --------- ------------------- --------- ------------------- --------- OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 246 246 246 1 1 0677 WED. 1 32 0708 SAM. 1 60 0736 SAM. 2 2 0678 THU. 1 ! 2 33 0709 SUN. ---- 2 61 0737 SUN. ---- 3 3 0679 FRI. 3 34 0710 MON. ---- 3 62 0738 MON. ---- 4 4 0680 SAM. 4 35 0711 TUE. 4 63 0739 TUE. 5 5 0681 SUN. ---- 5 36 0712 WED. 5 64 0740 WED. 6 6 0682 MON. ---- 6 37 0713 THU. 6 ! 6 65 0741 THU. 10 ! 7 7 0683 TUE. 7 38 0714 FRI. 7 66 0742 FRI. 8 8 0684 WED. 8 39 0715 SAM. 8 67 0743 SAM. 9 9 0685 THU. 2 ! 9 40 0716 SUN. ---- 9 68 0744 SUN. ---- 10 10 0686 FRI. 10 41 0717 MON. ---- 10 69 0745 MON. ---- 11 11 0687 SAM. 11 42 0718 TUE. 11 70 0746 TUE. 12 12 0688 SUN. ---- 12 43 0719 WED. 12 71 0747 WED. 13 13 0689 MON. ---- 13 44 0720 THU. 7 ! 13 72 0748 THU. 11 ! 14 14 0690 TUE. 14 45 0721 FRI. 14 73 0749 FRI. 15 15 0691 WED. 15 46 0722 SAM. 15 74 0750 SAM. 16 16 0692 THU. 3 ! 16 47 0723 SUN. ---- 16 75 0751 SUN. ---- 17 17 0693 FRI. 17 48 0724 MON. ---- 17 76 0752 MON. ---- 18 18 0694 SAM. 18 49 0725 TUE. 18 77 0753 TUE. 19 19 0695 SUN. ---- 19 50 0726 WED. 19 78 0754 WED. 20 20 0696 MON. ---- 20 51 0727 THU. 8 ! 20 79 0755 THU. 12 ! 21 21 0697 TUE. 21 52 0728 FRI. 21 80 0756 FRI. 22 22 0698 WED. 22 53 0729 SAM. 22 81 0757 SAM. 23 23 0699 THU. 4 ! 23 54 0730 SUN. ---- 23 82 0758 SUN. ---- 24 24 0700 FRI. 24 55 0731 MON. ---- 24 83 0759 MON. ---- 25 25 0701 SAM. 25 56 0732 TUE. 25 84 0760 TUE. 26 26 0702 SUN. ---- 26 57 0733 WED. 26 85 0761 WED. 27 27 0703 MON. ---- 27 58 0734 THU. 9 ! 27 86 0762 THU. 13 ! 28 28 0704 TUE. 28 59 0735 FRI. 28 87 0763 FRI. 29 29 0705 WED. 29 88 0764 SAM. 30 30 0706 THU. 5 ! 30 89 0765 SUN. ---- 31 31 0707 FRI. 31 90 0766 MON. ---- ------------------------------ ------------------------------ ------------------------------ 2025.-CALENDAR-. APRIL MAY JUNE ------------------------------ ------------------------------ ------------------------------ DAY DAY & NO DAY DAY & NO DAY DAY & NO ------------------- --------- ------------------- --------- ------------------- --------- OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 246 246 246 1 91 0767 TUE. 1 121 0797 THU. 18 ! 1 152 0828 SUN. ---- 2 92 0768 WED. 2 122 0798 FRI. 2 153 0829 MON. ---- 3 93 0769 THU. 14 ! 3 123 0799 SAM. 3 154 0830 TUE. 4 94 0770 FRI. 4 124 0800 SUN. ---- 4 155 0831 WED. 5 95 0771 SAM. 5 125 0801 MON. ---- 5 156 0832 THU. 23 ! 6 96 0772 SUN. ---- 6 126 0802 TUE. 6 157 0833 FRI. 7 97 0773 MON. ---- 7 127 0803 WED. 7 158 0834 SAM. 8 98 0774 TUE. 8 128 0804 THU. 19 ! 8 159 0835 SUN. ---- 9 99 0775 WED. 9 129 0805 FRI. 9 160 0836 MON. ---- 10 100 0776 THU. 15 ! 10 130 0806 SAM. 10 161 0837 TUE. 11 101 0777 FRI. 11 131 0807 SUN. ---- 11 162 0838 WED. 12 102 0778 SAM. 12 132 0808 MON. ---- 12 163 0839 THU. 24 ! 13 103 0779 SUN. ---- 13 133 0809 TUE. 13 164 0840 FRI. 14 104 0780 MON. ---- 14 134 0810 WED. 14 165 0841 SAM. 15 105 0781 TUE. 15 135 0811 THU. 20 ! 15 166 0842 SUN. ---- 16 106 0782 WED. 16 136 0812 FRI. 16 167 0843 MON. ---- 17 107 0783 THU. 16 ! 17 137 0813 SAM. 17 168 0844 TUE. 18 108 0784 FRI. 18 138 0814 SUN. ---- 18 169 0845 WED. 19 109 0785 SAM. 19 139 0815 MON. ---- 19 170 0846 THU. 25 ! 20 110 0786 SUN. ---- 20 140 0816 TUE. 20 171 0847 FRI. 21 111 0787 MON. ---- 21 141 0817 WED. 21 172 0848 SAM. 22 112 0788 TUE. 22 142 0818 THU. 21 ! 22 173 0849 SUN. ---- 23 113 0789 WED. 23 143 0819 FRI. 23 174 0850 MON. ---- 24 114 0790 THU. 17 ! 24 144 0820 SAM. 24 175 0851 TUE. 25 115 0791 FRI. 25 145 0821 SUN. ---- 25 176 0852 WED. 26 116 0792 SAM. 26 146 0822 MON. ---- 26 177 0853 THU. 26 ! 27 117 0793 SUN. ---- 27 147 0823 TUE. 27 178 0854 FRI. 28 118 0794 MON. ---- 28 148 0824 WED. 28 179 0855 SAM. 29 119 0795 TUE. 29 149 0825 THU. 22 ! 29 180 0856 SUN. ---- 30 120 0796 WED. 30 150 0826 FRI. 30 181 0857 MON. ---- 31 151 0827 SAM. ------------------------------ ------------------------------ ------------------------------ 2025.-CALENDAR-. JULY AUGUST SEPTEMBER ------------------------------ ------------------------------ ------------------------------ DAY DAY & NO DAY DAY & NO DAY DAY & NO ------------------- --------- ------------------- --------- ------------------- --------- OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 246 246 246 1 182 0858 TUE. 1 213 0889 FRI. 1 244 0920 MON. ---- 2 183 0859 WED. 2 214 0890 SAM. 2 245 0921 TUE. 3 184 0860 THU. 27 ! 3 215 0891 SUN. ---- 3 246 0922 WED. 4 185 0861 FRI. 4 216 0892 MON. ---- 4 247 0923 THU. 36 ! 5 186 0862 SAM. 5 217 0893 TUE. 5 248 0924 FRI. 6 187 0863 SUN. ---- 6 218 0894 WED. 6 249 0925 SAM. 7 188 0864 MON. ---- 7 219 0895 THU. 32 ! 7 250 0926 SUN. ---- 8 189 0865 TUE. 8 220 0896 FRI. 8 251 0927 MON. ---- 9 190 0866 WED. 9 221 0897 SAM. 9 252 0928 TUE. 10 191 0867 THU. 28 ! 10 222 0898 SUN. ---- 10 253 0929 WED. 11 192 0868 FRI. 11 223 0899 MON. ---- 11 254 0930 THU. 37 ! 12 193 0869 SAM. 12 224 0900 TUE. 12 255 0931 FRI. 13 194 0870 SUN. ---- 13 225 0901 WED. 13 256 0932 SAM. 14 195 0871 MON. ---- 14 226 0902 THU. 33 ! 14 257 0933 SUN. ---- 15 196 0872 TUE. 15 227 0903 FRI. 15 258 0934 MON. ---- 16 197 0873 WED. 16 228 0904 SAM. 16 259 0935 TUE. 17 198 0874 THU. 29 ! 17 229 0905 SUN. ---- 17 260 0936 WED. 18 199 0875 FRI. 18 230 0906 MON. ---- 18 261 0937 THU. 38 ! 19 200 0876 SAM. 19 231 0907 TUE. 19 262 0938 FRI. 20 201 0877 SUN. ---- 20 232 0908 WED. 20 263 0939 SAM. 21 202 0878 MON. ---- 21 233 0909 THU. 34 ! 21 264 0940 SUN. ---- 22 203 0879 TUE. 22 234 0910 FRI. 22 265 0941 MON. ---- 23 204 0880 WED. 23 235 0911 SAM. 23 266 0942 TUE. 24 205 0881 THU. 30 ! 24 236 0912 SUN. ---- 24 267 0943 WED. 25 206 0882 FRI. 25 237 0913 MON. ---- 25 268 0944 THU. 39 ! 26 207 0883 SAM. 26 238 0914 TUE. 26 269 0945 FRI. 27 208 0884 SUN. ---- 27 239 0915 WED. 27 270 0946 SAM. 28 209 0885 MON. ---- 28 240 0916 THU. 35 ! 28 271 0947 SUN. ---- 29 210 0886 TUE. 29 241 0917 FRI. 29 272 0948 MON. ---- 30 211 0887 WED. 30 242 0918 SAM. 30 273 0949 TUE. 31 212 0888 THU. 31 ! 31 243 0919 SUN. ---- ------------------------------ ------------------------------ ------------------------------ 2025.-CALENDAR-. OCTOBER NOVEMBER DECEMBER ------------------------------ ------------------------------ ------------------------------ DAY DAY & NO DAY DAY & NO DAY DAY & NO ------------------- --------- ------------------- --------- ------------------- --------- OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE OF OF THE JULIAN OF THE MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK MOIS YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 246 246 246 1 274 0950 WED. 1 305 0981 SAM. 1 335 1011 MON. ---- 2 275 0951 THU. 40 ! 2 306 0982 SUN. ---- 2 336 1012 TUE. 3 276 0952 FRI. 3 307 0983 MON. ---- 3 337 1013 WED. 4 277 0953 SAM. 4 308 0984 TUE. 4 338 1014 THU. 49 ! 5 278 0954 SUN. ---- 5 309 0985 WED. 5 339 1015 FRI. 6 279 0955 MON. ---- 6 310 0986 THU. 45 ! 6 340 1016 SAM. 7 280 0956 TUE. 7 311 0987 FRI. 7 341 1017 SUN. ---- 8 281 0957 WED. 8 312 0988 SAM. 8 342 1018 MON. ---- 9 282 0958 THU. 41 ! 9 313 0989 SUN. ---- 9 343 1019 TUE. 10 283 0959 FRI. 10 314 0990 MON. ---- 10 344 1020 WED. 11 284 0960 SAM. 11 315 0991 TUE. 11 345 1021 THU. 50 ! 12 285 0961 SUN. ---- 12 316 0992 WED. 12 346 1022 FRI. 13 286 0962 MON. ---- 13 317 0993 THU. 46 ! 13 347 1023 SAM. 14 287 0963 TUE. 14 318 0994 FRI. 14 348 1024 SUN. ---- 15 288 0964 WED. 15 319 0995 SAM. 15 349 1025 MON. ---- 16 289 0965 THU. 42 ! 16 320 0996 SUN. ---- 16 350 1026 TUE. 17 290 0966 FRI. 17 321 0997 MON. ---- 17 351 1027 WED. 18 291 0967 SAM. 18 322 0998 TUE. 18 352 1028 THU. 51 ! 19 292 0968 SUN. ---- 19 323 0999 WED. 19 353 1029 FRI. 20 293 0969 MON. ---- 20 324 1000 THU. 47 ! 20 354 1030 SAM. 21 294 0970 TUE. 21 325 1001 FRI. 21 355 1031 SUN. ---- 22 295 0971 WED. 22 326 1002 SAM. 22 356 1032 MON. ---- 23 296 0972 THU. 43 ! 23 327 1003 SUN. ---- 23 357 1033 TUE. 24 297 0973 FRI. 24 328 1004 MON. ---- 24 358 1034 WED. 25 298 0974 SAM. 25 329 1005 TUE. 25 359 1035 THU. 52 ! 26 299 0975 SUN. ---- 26 330 1006 WED. 26 360 1036 FRI. 27 300 0976 MON. ---- 27 331 1007 THU. 48 ! 27 361 1037 SAM. 28 301 0977 TUE. 28 332 1008 FRI. 28 362 1038 SUN. ---- 29 302 0978 WED. 29 333 1009 SAM. 29 363 1039 MON. ---- 30 303 0979 THU. 44 ! 30 334 1010 SUN. ---- 30 364 1040 TUE. 31 304 0980 FRI. 31 365 1041 WED. ------------------------------ ------------------------------ ------------------------------