Understanding >Astronomical calculations
************************************************************************************************************ * * * 2021.-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 9216 FRI. 1 32 9247 MON. ---- 1 60 9275 MON. ---- * * 2 2 9217 SAM. 2 33 9248 TUE. 2 61 9276 TUE. * * 3 3 9218 SUN. ---- 3 34 9249 WED. 3 62 9277 WED. * * 4 4 9219 MON. ---- 4 35 9250 THU. 5 ! 4 63 9278 THU. 9 ! * * 5 5 9220 TUE. 5 36 9251 FRI. 5 64 9279 FRI. * * 6 6 9221 WED. 6 37 9252 SAM. 6 65 9280 SAM. * * 7 7 9222 THU. 1 ! 7 38 9253 SUN. ---- 7 66 9281 SUN. ---- * * 8 8 9223 FRI. 8 39 9254 MON. ---- 8 67 9282 MON. ---- * * 9 9 9224 SAM. 9 40 9255 TUE. 9 68 9283 TUE. * * 10 10 9225 SUN. ---- 10 41 9256 WED. 10 69 9284 WED. * * 11 11 9226 MON. ---- 11 42 9257 THU. 6 ! 11 70 9285 THU. 10 ! * * 12 12 9227 TUE. 12 43 9258 FRI. 12 71 9286 FRI. * * 13 13 9228 WED. 13 44 9259 SAM. 13 72 9287 SAM. * * 14 14 9229 THU. 2 ! 14 45 9260 SUN. ---- 14 73 9288 SUN. ---- * * 15 15 9230 FRI. 15 46 9261 MON. ---- 15 74 9289 MON. ---- * * 16 16 9231 SAM. 16 47 9262 TUE. 16 75 9290 TUE. * * 17 17 9232 SUN. ---- 17 48 9263 WED. 17 76 9291 WED. * * 18 18 9233 MON. ---- 18 49 9264 THU. 7 ! 18 77 9292 THU. 11 ! * * 19 19 9234 TUE. 19 50 9265 FRI. 19 78 9293 FRI. * * 20 20 9235 WED. 20 51 9266 SAM. 20 79 9294 SAM. * * 21 21 9236 THU. 3 ! 21 52 9267 SUN. ---- 21 80 9295 SUN. ---- * * 22 22 9237 FRI. 22 53 9268 MON. ---- 22 81 9296 MON. ---- * * 23 23 9238 SAM. 23 54 9269 TUE. 23 82 9297 TUE. * * 24 24 9239 SUN. ---- 24 55 9270 WED. 24 83 9298 WED. * * 25 25 9240 MON. ---- 25 56 9271 THU. 8 ! 25 84 9299 THU. 12 ! * * 26 26 9241 TUE. 26 57 9272 FRI. 26 85 9300 FRI. * * 27 27 9242 WED. 27 58 9273 SAM. 27 86 9301 SAM. * * 28 28 9243 THU. 4 ! 28 59 9274 SUN. ---- 28 87 9302 SUN. ---- * * 29 29 9244 FRI. 29 88 9303 MON. ---- * * 30 30 9245 SAM. 30 89 9304 TUE. * * 31 31 9246 SUN. ---- 31 90 9305 WED. * * ------------------------------ ------------------------------ ------------------------------ * * * * * ************************************************************************************************************ ************************************************************************************************************ * * * 2021.-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 91 9306 THU. 13 ! 1 121 9336 SAM. 1 152 9367 TUE. * * 2 92 9307 FRI. 2 122 9337 SUN. ---- 2 153 9368 WED. * * 3 93 9308 SAM. 3 123 9338 MON. ---- 3 154 9369 THU. 22 ! * * 4 94 9309 SUN. ---- 4 124 9339 TUE. 4 155 9370 FRI. * * 5 95 9310 MON. ---- 5 125 9340 WED. 5 156 9371 SAM. * * 6 96 9311 TUE. 6 126 9341 THU. 18 ! 6 157 9372 SUN. ---- * * 7 97 9312 WED. 7 127 9342 FRI. 7 158 9373 MON. ---- * * 8 98 9313 THU. 14 ! 8 128 9343 SAM. 8 159 9374 TUE. * * 9 99 9314 FRI. 9 129 9344 SUN. ---- 9 160 9375 WED. * * 10 100 9315 SAM. 10 130 9345 MON. ---- 10 161 9376 THU. 23 ! * * 11 101 9316 SUN. ---- 11 131 9346 TUE. 11 162 9377 FRI. * * 12 102 9317 MON. ---- 12 132 9347 WED. 12 163 9378 SAM. * * 13 103 9318 TUE. 13 133 9348 THU. 19 ! 13 164 9379 SUN. ---- * * 14 104 9319 WED. 14 134 9349 FRI. 14 165 9380 MON. ---- * * 15 105 9320 THU. 15 ! 15 135 9350 SAM. 15 166 9381 TUE. * * 16 106 9321 FRI. 16 136 9351 SUN. ---- 16 167 9382 WED. * * 17 107 9322 SAM. 17 137 9352 MON. ---- 17 168 9383 THU. 24 ! * * 18 108 9323 SUN. ---- 18 138 9353 TUE. 18 169 9384 FRI. * * 19 109 9324 MON. ---- 19 139 9354 WED. 19 170 9385 SAM. * * 20 110 9325 TUE. 20 140 9355 THU. 20 ! 20 171 9386 SUN. ---- * * 21 111 9326 WED. 21 141 9356 FRI. 21 172 9387 MON. ---- * * 22 112 9327 THU. 16 ! 22 142 9357 SAM. 22 173 9388 TUE. * * 23 113 9328 FRI. 23 143 9358 SUN. ---- 23 174 9389 WED. * * 24 114 9329 SAM. 24 144 9359 MON. ---- 24 175 9390 THU. 25 ! * * 25 115 9330 SUN. ---- 25 145 9360 TUE. 25 176 9391 FRI. * * 26 116 9331 MON. ---- 26 146 9361 WED. 26 177 9392 SAM. * * 27 117 9332 TUE. 27 147 9362 THU. 21 ! 27 178 9393 SUN. ---- * * 28 118 9333 WED. 28 148 9363 FRI. 28 179 9394 MON. ---- * * 29 119 9334 THU. 17 ! 29 149 9364 SAM. 29 180 9395 TUE. * * 30 120 9335 FRI. 30 150 9365 SUN. ---- 30 181 9396 WED. * * 31 151 9366 MON. ---- * * ------------------------------ ------------------------------ ------------------------------ * * * * * ************************************************************************************************************ ************************************************************************************************************ * * * 2021.-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 * * * * 1 182 9397 THU. 26 ! 1 213 9428 SUN. ---- 1 244 9459 WED. * * 2 183 9398 FRI. 2 214 9429 MON. ---- 2 245 9460 THU. 35 ! * * 3 184 9399 SAM. 3 215 9430 TUE. 3 246 9461 FRI. * * 4 185 9400 SUN. ---- 4 216 9431 WED. 4 247 9462 SAM. * * 5 186 9401 MON. ---- 5 217 9432 THU. 31 ! 5 248 9463 SUN. ---- * * 6 187 9402 TUE. 6 218 9433 FRI. 6 249 9464 MON. ---- * * 7 188 9403 WED. 7 219 9434 SAM. 7 250 9465 TUE. * * 8 189 9404 THU. 27 ! 8 220 9435 SUN. ---- 8 251 9466 WED. * * 9 190 9405 FRI. 9 221 9436 MON. ---- 9 252 9467 THU. 36 ! * * 10 191 9406 SAM. 10 222 9437 TUE. 10 253 9468 FRI. * * 11 192 9407 SUN. ---- 11 223 9438 WED. 11 254 9469 SAM. * * 12 193 9408 MON. ---- 12 224 9439 THU. 32 ! 12 255 9470 SUN. ---- * * 13 194 9409 TUE. 13 225 9440 FRI. 13 256 9471 MON. ---- * * 14 195 9410 WED. 14 226 9441 SAM. 14 257 9472 TUE. * * 15 196 9411 THU. 28 ! 15 227 9442 SUN. ---- 15 258 9473 WED. * * 16 197 9412 FRI. 16 228 9443 MON. ---- 16 259 9474 THU. 37 ! * * 17 198 9413 SAM. 17 229 9444 TUE. 17 260 9475 FRI. * * 18 199 9414 SUN. ---- 18 230 9445 WED. 18 261 9476 SAM. * * 19 200 9415 MON. ---- 19 231 9446 THU. 33 ! 19 262 9477 SUN. ---- * * 20 201 9416 TUE. 20 232 9447 FRI. 20 263 9478 MON. ---- * * 21 202 9417 WED. 21 233 9448 SAM. 21 264 9479 TUE. * * 22 203 9418 THU. 29 ! 22 234 9449 SUN. ---- 22 265 9480 WED. * * 23 204 9419 FRI. 23 235 9450 MON. ---- 23 266 9481 THU. 38 ! * * 24 205 9420 SAM. 24 236 9451 TUE. 24 267 9482 FRI. * * 25 206 9421 SUN. ---- 25 237 9452 WED. 25 268 9483 SAM. * * 26 207 9422 MON. ---- 26 238 9453 THU. 34 ! 26 269 9484 SUN. ---- * * 27 208 9423 TUE. 27 239 9454 FRI. 27 270 9485 MON. ---- * * 28 209 9424 WED. 28 240 9455 SAM. 28 271 9486 TUE. * * 29 210 9425 THU. 30 ! 29 241 9456 SUN. ---- 29 272 9487 WED. * * 30 211 9426 FRI. 30 242 9457 MON. ---- 30 273 9488 THU. 39 ! * * 31 212 9427 SAM. 31 243 9458 TUE. * * ------------------------------ ------------------------------ ------------------------------ * * * * * ************************************************************************************************************ ************************************************************************************************************ * * * 2021.-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 * * * * 1 274 9489 FRI. 1 305 9520 MON. ---- 1 335 9550 WED. * * 2 275 9490 SAM. 2 306 9521 TUE. 2 336 9551 THU. 48 ! * * 3 276 9491 SUN. ---- 3 307 9522 WED. 3 337 9552 FRI. * * 4 277 9492 MON. ---- 4 308 9523 THU. 44 ! 4 338 9553 SAM. * * 5 278 9493 TUE. 5 309 9524 FRI. 5 339 9554 SUN. ---- * * 6 279 9494 WED. 6 310 9525 SAM. 6 340 9555 MON. ---- * * 7 280 9495 THU. 40 ! 7 311 9526 SUN. ---- 7 341 9556 TUE. * * 8 281 9496 FRI. 8 312 9527 MON. ---- 8 342 9557 WED. * * 9 282 9497 SAM. 9 313 9528 TUE. 9 343 9558 THU. 49 ! * * 10 283 9498 SUN. ---- 10 314 9529 WED. 10 344 9559 FRI. * * 11 284 9499 MON. ---- 11 315 9530 THU. 45 ! 11 345 9560 SAM. * * 12 285 9500 TUE. 12 316 9531 FRI. 12 346 9561 SUN. ---- * * 13 286 9501 WED. 13 317 9532 SAM. 13 347 9562 MON. ---- * * 14 287 9502 THU. 41 ! 14 318 9533 SUN. ---- 14 348 9563 TUE. * * 15 288 9503 FRI. 15 319 9534 MON. ---- 15 349 9564 WED. * * 16 289 9504 SAM. 16 320 9535 TUE. 16 350 9565 THU. 50 ! * * 17 290 9505 SUN. ---- 17 321 9536 WED. 17 351 9566 FRI. * * 18 291 9506 MON. ---- 18 322 9537 THU. 46 ! 18 352 9567 SAM. * * 19 292 9507 TUE. 19 323 9538 FRI. 19 353 9568 SUN. ---- * * 20 293 9508 WED. 20 324 9539 SAM. 20 354 9569 MON. ---- * * 21 294 9509 THU. 42 ! 21 325 9540 SUN. ---- 21 355 9570 TUE. * * 22 295 9510 FRI. 22 326 9541 MON. ---- 22 356 9571 WED. * * 23 296 9511 SAM. 23 327 9542 TUE. 23 357 9572 THU. 51 ! * * 24 297 9512 SUN. ---- 24 328 9543 WED. 24 358 9573 FRI. * * 25 298 9513 MON. ---- 25 329 9544 THU. 47 ! 25 359 9574 SAM. * * 26 299 9514 TUE. 26 330 9545 FRI. 26 360 9575 SUN. ---- * * 27 300 9515 WED. 27 331 9546 SAM. 27 361 9576 MON. ---- * * 28 301 9516 THU. 43 ! 28 332 9547 SUN. ---- 28 362 9577 TUE. * * 29 302 9517 FRI. 29 333 9548 MON. ---- 29 363 9578 WED. * * 30 303 9518 SAM. 30 334 9549 TUE. 30 364 9579 THU. 52 ! * * 31 304 9519 SUN. ---- 31 365 9580 FRI. * * ------------------------------ ------------------------------ ------------------------------ * * * * * ************************************************************************************************************