Understanding >Astronomical calculations
2020.-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 MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 245 245 245 1 1 8850 WED. 1 32 8881 SAM. 1 61 8910 SUN. ---- 2 2 8851 THU. 1 ! 2 33 8882 SUN. ---- 2 62 8911 MON. ---- 3 3 8852 FRI. 3 34 8883 MON. ---- 3 63 8912 TUE. 4 4 8853 SAM. 4 35 8884 TUE. 4 64 8913 WED. 5 5 8854 SUN. ---- 5 36 8885 WED. 5 65 8914 THU. 10 ! 6 6 8855 MON. ---- 6 37 8886 THU. 6 ! 6 66 8915 FRI. 7 7 8856 TUE. 7 38 8887 FRI. 7 67 8916 SAM. 8 8 8857 WED. 8 39 8888 SAM. 8 68 8917 SUN. ---- 9 9 8858 THU. 2 ! 9 40 8889 SUN. ---- 9 69 8918 MON. ---- 10 10 8859 FRI. 10 41 8890 MON. ---- 10 70 8919 TUE. 11 11 8860 SAM. 11 42 8891 TUE. 11 71 8920 WED. 12 12 8861 SUN. ---- 12 43 8892 WED. 12 72 8921 THU. 11 ! 13 13 8862 MON. ---- 13 44 8893 THU. 7 ! 13 73 8922 FRI. 14 14 8863 TUE. 14 45 8894 FRI. 14 74 8923 SAM. 15 15 8864 WED. 15 46 8895 SAM. 15 75 8924 SUN. ---- 16 16 8865 THU. 3 ! 16 47 8896 SUN. ---- 16 76 8925 MON. ---- 17 17 8866 FRI. 17 48 8897 MON. ---- 17 77 8926 TUE. 18 18 8867 SAM. 18 49 8898 TUE. 18 78 8927 WED. 19 19 8868 SUN. ---- 19 50 8899 WED. 19 79 8928 THU. 12 ! 20 20 8869 MON. ---- 20 51 8900 THU. 8 ! 20 80 8929 FRI. 21 21 8870 TUE. 21 52 8901 FRI. 21 81 8930 SAM. 22 22 8871 WED. 22 53 8902 SAM. 22 82 8931 SUN. ---- 23 23 8872 THU. 4 ! 23 54 8903 SUN. ---- 23 83 8932 MON. ---- 24 24 8873 FRI. 24 55 8904 MON. ---- 24 84 8933 TUE. 25 25 8874 SAM. 25 56 8905 TUE. 25 85 8934 WED. 26 26 8875 SUN. ---- 26 57 8906 WED. 26 86 8935 THU. 13 ! 27 27 8876 MON. ---- 27 58 8907 THU. 9 ! 27 87 8936 FRI. 28 28 8877 TUE. 28 59 8908 FRI. 28 88 8937 SAM. 29 29 8878 WED. 29 60 8909 SAM. 29 89 8938 SUN. ---- 30 30 8879 THU. 5 ! 30 90 8939 MON. ---- 31 31 8880 FRI. 31 91 8940 TUE. ------------------------------ ------------------------------ ------------------------------ 2020.-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 MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 245 245 245 1 92 8941 WED. 1 122 8971 FRI. 1 153 9002 MON. ---- 2 93 8942 THU. 14 ! 2 123 8972 SAM. 2 154 9003 TUE. 3 94 8943 FRI. 3 124 8973 SUN. ---- 3 155 9004 WED. 4 95 8944 SAM. 4 125 8974 MON. ---- 4 156 9005 THU. 23 ! 5 96 8945 SUN. ---- 5 126 8975 TUE. 5 157 9006 FRI. 6 97 8946 MON. ---- 6 127 8976 WED. 6 158 9007 SAM. 7 98 8947 TUE. 7 128 8977 THU. 19 ! 7 159 9008 SUN. ---- 8 99 8948 WED. 8 129 8978 FRI. 8 160 9009 MON. ---- 9 100 8949 THU. 15 ! 9 130 8979 SAM. 9 161 9010 TUE. 10 101 8950 FRI. 10 131 8980 SUN. ---- 10 162 9011 WED. 11 102 8951 SAM. 11 132 8981 MON. ---- 11 163 9012 THU. 24 ! 12 103 8952 SUN. ---- 12 133 8982 TUE. 12 164 9013 FRI. 13 104 8953 MON. ---- 13 134 8983 WED. 13 165 9014 SAM. 14 105 8954 TUE. 14 135 8984 THU. 20 ! 14 166 9015 SUN. ---- 15 106 8955 WED. 15 136 8985 FRI. 15 167 9016 MON. ---- 16 107 8956 THU. 16 ! 16 137 8986 SAM. 16 168 9017 TUE. 17 108 8957 FRI. 17 138 8987 SUN. ---- 17 169 9018 WED. 18 109 8958 SAM. 18 139 8988 MON. ---- 18 170 9019 THU. 25 ! 19 110 8959 SUN. ---- 19 140 8989 TUE. 19 171 9020 FRI. 20 111 8960 MON. ---- 20 141 8990 WED. 20 172 9021 SAM. 21 112 8961 TUE. 21 142 8991 THU. 21 ! 21 173 9022 SUN. ---- 22 113 8962 WED. 22 143 8992 FRI. 22 174 9023 MON. ---- 23 114 8963 THU. 17 ! 23 144 8993 SAM. 23 175 9024 TUE. 24 115 8964 FRI. 24 145 8994 SUN. ---- 24 176 9025 WED. 25 116 8965 SAM. 25 146 8995 MON. ---- 25 177 9026 THU. 26 ! 26 117 8966 SUN. ---- 26 147 8996 TUE. 26 178 9027 FRI. 27 118 8967 MON. ---- 27 148 8997 WED. 27 179 9028 SAM. 28 119 8968 TUE. 28 149 8998 THU. 22 ! 28 180 9029 SUN. ---- 29 120 8969 WED. 29 150 8999 FRI. 29 181 9030 MON. ---- 30 121 8970 THU. 18 ! 30 151 9000 SAM. 30 182 9031 TUE. 31 152 9001 SUN. ---- ------------------------------ ------------------------------ ------------------------------ 2020.-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 MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 245 245 245 1 183 9032 WED. 1 214 9063 SAM. 1 245 9094 TUE. 2 184 9033 THU. 27 ! 2 215 9064 SUN. ---- 2 246 9095 WED. 3 185 9034 FRI. 3 216 9065 MON. ---- 3 247 9096 THU. 36 ! 4 186 9035 SAM. 4 217 9066 TUE. 4 248 9097 FRI. 5 187 9036 SUN. ---- 5 218 9067 WED. 5 249 9098 SAM. 6 188 9037 MON. ---- 6 219 9068 THU. 32 ! 6 250 9099 SUN. ---- 7 189 9038 TUE. 7 220 9069 FRI. 7 251 9100 MON. ---- 8 190 9039 WED. 8 221 9070 SAM. 8 252 9101 TUE. 9 191 9040 THU. 28 ! 9 222 9071 SUN. ---- 9 253 9102 WED. 10 192 9041 FRI. 10 223 9072 MON. ---- 10 254 9103 THU. 37 ! 11 193 9042 SAM. 11 224 9073 TUE. 11 255 9104 FRI. 12 194 9043 SUN. ---- 12 225 9074 WED. 12 256 9105 SAM. 13 195 9044 MON. ---- 13 226 9075 THU. 33 ! 13 257 9106 SUN. ---- 14 196 9045 TUE. 14 227 9076 FRI. 14 258 9107 MON. ---- 15 197 9046 WED. 15 228 9077 SAM. 15 259 9108 TUE. 16 198 9047 THU. 29 ! 16 229 9078 SUN. ---- 16 260 9109 WED. 17 199 9048 FRI. 17 230 9079 MON. ---- 17 261 9110 THU. 38 ! 18 200 9049 SAM. 18 231 9080 TUE. 18 262 9111 FRI. 19 201 9050 SUN. ---- 19 232 9081 WED. 19 263 9112 SAM. 20 202 9051 MON. ---- 20 233 9082 THU. 34 ! 20 264 9113 SUN. ---- 21 203 9052 TUE. 21 234 9083 FRI. 21 265 9114 MON. ---- 22 204 9053 WED. 22 235 9084 SAM. 22 266 9115 TUE. 23 205 9054 THU. 30 ! 23 236 9085 SUN. ---- 23 267 9116 WED. 24 206 9055 FRI. 24 237 9086 MON. ---- 24 268 9117 THU. 39 ! 25 207 9056 SAM. 25 238 9087 TUE. 25 269 9118 FRI. 26 208 9057 SUN. ---- 26 239 9088 WED. 26 270 9119 SAM. 27 209 9058 MON. ---- 27 240 9089 THU. 35 ! 27 271 9120 SUN. ---- 28 210 9059 TUE. 28 241 9090 FRI. 28 272 9121 MON. ---- 29 211 9060 WED. 29 242 9091 SAM. 29 273 9122 TUE. 30 212 9061 THU. 31 ! 30 243 9092 SUN. ---- 30 274 9123 WED. 31 213 9062 FRI. 31 244 9093 MON. ---- ------------------------------ ------------------------------ ------------------------------ 2020.-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 MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK MONTH YEAR ELAPSED WEEK AT 12H UTC AT 12H UTC AT 12H UTC ------------------- --------- ------------------- --------- ------------------- --------- 245 245 245 1 275 9124 THU. 40 ! 1 306 9155 SUN. ---- 1 336 9185 TUE. 2 276 9125 FRI. 2 307 9156 MON. ---- 2 337 9186 WED. 3 277 9126 SAM. 3 308 9157 TUE. 3 338 9187 THU. 49 ! 4 278 9127 SUN. ---- 4 309 9158 WED. 4 339 9188 FRI. 5 279 9128 MON. ---- 5 310 9159 THU. 45 ! 5 340 9189 SAM. 6 280 9129 TUE. 6 311 9160 FRI. 6 341 9190 SUN. ---- 7 281 9130 WED. 7 312 9161 SAM. 7 342 9191 MON. ---- 8 282 9131 THU. 41 ! 8 313 9162 SUN. ---- 8 343 9192 TUE. 9 283 9132 FRI. 9 314 9163 MON. ---- 9 344 9193 WED. 10 284 9133 SAM. 10 315 9164 TUE. 10 345 9194 THU. 50 ! 11 285 9134 SUN. ---- 11 316 9165 WED. 11 346 9195 FRI. 12 286 9135 MON. ---- 12 317 9166 THU. 46 ! 12 347 9196 SAM. 13 287 9136 TUE. 13 318 9167 FRI. 13 348 9197 SUN. ---- 14 288 9137 WED. 14 319 9168 SAM. 14 349 9198 MON. ---- 15 289 9138 THU. 42 ! 15 320 9169 SUN. ---- 15 350 9199 TUE. 16 290 9139 FRI. 16 321 9170 MON. ---- 16 351 9200 WED. 17 291 9140 SAM. 17 322 9171 TUE. 17 352 9201 THU. 51 ! 18 292 9141 SUN. ---- 18 323 9172 WED. 18 353 9202 FRI. 19 293 9142 MON. ---- 19 324 9173 THU. 47 ! 19 354 9203 SAM. 20 294 9143 TUE. 20 325 9174 FRI. 20 355 9204 SUN. ---- 21 295 9144 WED. 21 326 9175 SAM. 21 356 9205 MON. ---- 22 296 9145 THU. 43 ! 22 327 9176 SUN. ---- 22 357 9206 TUE. 23 297 9146 FRI. 23 328 9177 MON. ---- 23 358 9207 WED. 24 298 9147 SAM. 24 329 9178 TUE. 24 359 9208 THU. 52 ! 25 299 9148 SUN. ---- 25 330 9179 WED. 25 360 9209 FRI. 26 300 9149 MON. ---- 26 331 9180 THU. 48 ! 26 361 9210 SAM. 27 301 9150 TUE. 27 332 9181 FRI. 27 362 9211 SUN. ---- 28 302 9151 WED. 28 333 9182 SAM. 28 363 9212 MON. ---- 29 303 9152 THU. 44 ! 29 334 9183 SUN. ---- 29 364 9213 TUE. 30 304 9153 FRI. 30 335 9184 MON. ---- 30 365 9214 WED. 31 305 9154 SAM. 31 366 9215 THU. 53 ! ------------------------------ ------------------------------ ------------------------------