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Bonavian Civil Calendar

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The Bonavian Civil calendar is a calendar reform proposed by Chris Carrier. Every month begins on a Sunday. Most months have exactly 4 weeks, but January, April, July and October have 5 weeks and also December in a leap year. The 5th week of December (when it occurs) is a leap week.

The Year Edit

The months of the year are as shown here:

1st Quarter
January
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W1 01 02 03 04 05 06 07
W2 08 09 10 11 12 13 14
W3 15 16 17 18 19 20 21
W4 22 23 24 25 26 27 28
W5 29 30 31 32 33 34 35
February
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W6 01 02 03 04 05 06 07
W7 08 09 10 11 12 13 14
W8 15 16 17 18 19 20 21
W9 22 23 24 25 26 27 28
March
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W10 01 02 03 04 05 06 07
W11 08 09 10 11 12 13 14
W12 15 16 17 18 19 20 21
W13 22 23 24 25 26 27 28
2nd Quarter
April
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W14 01 02 03 04 05 06 07
W15 08 09 10 11 12 13 14
W16 15 16 17 18 19 20 21
W17 22 23 24 25 26 27 28
W18 29 30 31 32 33 34 35
May
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W19 01 02 03 04 05 06 07
W20 08 09 10 11 12 13 14
W21 15 16 17 18 19 20 21
W22 22 23 24 25 26 27 28
June
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W23 01 02 03 04 05 06 07
W24 08 09 10 11 12 13 14
W25 15 16 17 18 19 20 21
W26 22 23 24 25 26 27 28
3rd Quarter
July
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W27 01 02 03 04 05 06 07
W28 08 09 10 11 12 13 14
W29 15 16 17 18 19 20 21
W30 22 23 24 25 26 27 28
W31 29 30 31 32 33 34 35
August
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W32 01 02 03 04 05 06 07
W33 08 09 10 11 12 13 14
W34 15 16 17 18 19 20 21
W35 22 23 24 25 26 27 28
September
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W36 01 02 03 04 05 06 07
W37 08 09 10 11 12 13 14
W38 15 16 17 18 19 20 21
W39 22 23 24 25 26 27 28
4th Quarter
October
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W40 01 02 03 04 05 06 07
W41 08 09 10 11 12 13 14
W42 15 16 17 18 19 20 21
W43 22 23 24 25 26 27 28
W44 29 30 31 32 33 34 35
November
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W45 01 02 03 04 05 06 07
W46 08 09 10 11 12 13 14
W47 15 16 17 18 19 20 21
W48 22 23 24 25 26 27 28
December
Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
W49 01 02 03 04 05 06 07
W50 08 09 10 11 12 13 14
W51 15 16 17 18 19 20 21
W52 22 23 24 25 26 27 28
W53 29 30 31 32 33 34 35
1st Quarter
Month Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
1 W01 01 02 03 04 05 06 07
W02 08 09 10 11 12 13 14
W03 15 16 17 18 19 20 21
W04 22 23 24 25 26 27 28
W05 29 30 31 32 33 34 35
2 W06 36 37 38 39 40 41 42
W07 43 44 45 46 47 48 49
W08 50 51 52 53 54 55 56
W09 57 58 59 60 61 62 63
3 W10 64 65 66 67 68 69 70
W11 71 72 73 74 75 76 77
W12 78 79 80 81 82 83 84
W13 85 86 87 88 89 90 91
2nd Quarter
Month Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
4 W14 092 093 094 095 096 097 098
W15 099 100 101 102 103 104 105
W16 106 107 108 109 110 111 112
W17 113 114 115 116 117 118 119
W18 120 121 122 123 124 125 126
5 W19 127 128 129 130 131 132 133
W20 134 135 136 137 138 139 140
W21 141 142 143 144 145 146 147
W22 148 149 150 151 152 153 154
6 W23 155 156 157 158 159 160 161
W24 162 163 164 165 166 167 168
W25 169 170 171 172 173 174 175
W26 176 177 178 179 180 181 182
3rd Quarter
Month Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
7 W27 183 184 185 186 187 188 189
W28 190 191 192 193 194 195 196
W29 197 198 199 200 201 202 203
W30 204 205 206 207 208 209 210
W31 211 212 213 214 215 216 217
8 W32 218 219 220 221 222 223 224
W33 225 226 227 228 229 230 231
W34 232 233 234 235 236 237 238
W35 239 240 241 242 243 244 245
9 W36 246 247 248 249 250 251 252
W37 253 254 255 256 257 258 259
W38 260 261 262 263 264 265 266
W39 267 268 269 270 271 272 273
4th Quarter
Month Week 1 2 3 4 5 6 7
Sun Mon Tue Wed Thu Fri Sat
10 W40 274 275 276 277 278 279 280
W41 281 282 283 284 285 286 287
W42 288 289 290 291 292 293 294
W43 295 296 297 298 299 300 301
W44 302 303 304 305 306 307 308
11 W45 309 310 311 312 313 314 315
W46 316 317 318 319 320 321 322
W47 323 324 325 326 327 328 329
W48 330 331 332 333 334 335 336
12 W49 337 338 339 340 341 342 343
W50 344 345 346 347 348 349 350
W51 351 352 353 354 355 356 357
W52 358 359 360 361 362 363 364
W53 365 366 367 368 369 370 371

Leap Year Rule Edit

The leap years are the years whose number is either divisible by 28 or has a remainder of 5, 11, 16 or 22. With these leap years the mean year would be 365.25 days the same as for the Julian Calendar. So there is an exception: those years whose number is divisible by 28*32=896 are not leap years. This brings the mean year down to 365.2421875 days.

Epoch Edit

An E-mail from Chris Carrier implies that year 1 began on Julian day number 27 = Sunday 21 December 4714 BC proleptic Gregorian calendar. So year 6721 begins 240*1461-7 weeks later on Sunday 23 December 2007.

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