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Davidian Jovian Calendar

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The Davidian Martian Calendar is a proposed system of time-keeping designed to serve the needs of future human settlers on the moons of the planet Jupiter. It was established by David Powell in Gregorian Year 2010.

Calendar TermsEdit

The Davidian calendar uses the same terminology as that used by the Gregorian calendar:

Minute: Period of 60 Jovian seconds

Hour: Period of 60 Jovian minutes .

Day: Period of 24 Jovian hours (24h 00m 14s on Earth). This unit of time completely disregards Jupiter's rotational period of 9.925 Earth hours.

Week: A period of 7, 8, or 9 days.

Month: A period of one or two weeks that roughly corresponds to the rotation/revolution period of either Ganymede or Callisto.

Earth: A period of 360 or 361 Jovian days that is nearly equivalent to an Earth year. There are 12 earths in one year, and they are given names that correspond to the months of the Gregorian year.

Year: 4331 days (12 earths). The revolution period of Jupiter and its moons around the Sun.

Year length Edit

The Jovian year is 4331.572 Earth days long. When divided evenly into 4331 days, a very convenient "day" of 24 hours, 11 seconds (Earth) is produced. This eliminates the need for intercalation and leap years.

Calendar LayoutEdit

The year is divided into 12 earths. All earths except for February have 361 days. February has 360 days.

There are two variants of the Davidian Jovian Calendar: One for Ganymede (and theoretically Europa) and one for Callisto. Both the Ganymede and Callisto variants have the same number of days per earth, the same number of earths per year, the same number of hours per day, and share the same calendar date at any given time (i.e. January 120th on Ganymede is also January 120th on Callisto). However, the two variants differ dramatically in terms of days and length of the week.

The Ganymede variant has a week consisting of seven days. One week is equal to one month, as Ganymede orbits Jupiter once every 7.1 Earth days. The final five weeks of December, however, hav an 8th day that serves the purpose keeping the calendar perpetual. Europa's revolution period is 3.55 Earth days, which is exactly half of Ganymede's period. Though Io is most likely unsuitable for colonization, its revolution period is half of Europa's period (1.67 Earth days). Therefore, the Ganymede variant would work for all three moons.

December   December   December
Sun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 51 52 53 54 101 102 103
6 7 8 9 10 11 12 55 56 57 58 59 60 61 104 105 106 107 108 109 110
13 14 15 16 17 18 19 62 63 64 65 66 67 68 111 112 113 114 115 116 117
20 21 22 23 24 25 26 69 70 71 72 73 74 75 118 119 120 121 122 123 124
27 28 29 30 31 32 33 76 77 78 79 80 81 82 125 126 127 128 129 130 131
34 35 36 37 38 39 40 83 84 85 86 87 88 89 132 133 134 135 136 137 138
41 42 43 44 45 46 47 90 91 92 93 94 95 96 139 140 141 142 143 144 145
48 49 50 97 98 99 100 146 147 148 149 150
         
December   December   December
Sun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat
151 152 201 251 252 253 254 255 256 257
153 154 155 156 157 158 159 202 203 204 205 206 207 208 258 259 260 261 262 263 264
160 161 162 163 164 165 166 209 210 211 212 213 214 215 265 266 267 268 269 270 271
167 168 169 170 171 172 173 216 217 218 219 220 221 222 272 273 274 275 276 277 278
174 175 176 177 178 179 180 223 224 225 226 227 228 229 279 280 281 282 283 284 285
181 182 183 184 185 186 187 230 231 232 233 234 235 236 286 287 288 289 290 291 292
188 189 190 191 192 193 194 237 238 239 240 241 242 243 293 294 295 296 297 298 299
195 196 197 198 199 200 244 245 246 247 248 249 250 300
   
December
Sun Mon Tue Wed Thu Fri Sat Ura
301 302 303 304 305 306
307 308 309 310 311 312 313
314 315 316 317 318 319 320 321
322 323 324 325 326 327 328 329
330 331 332 333 334 335 336 337
338 339 340 341 342 343 344 345
346 347 348 349 350 351 352 353

354 362

355 363 370 377 384 391 398 405 356 364 371 378 385 392 399 406 357 365 372 379 386 393 400 407 358 366 373 380 387 394 401 408 359 367 374 381 388 395 402 409 360 368 375 382 389 396 403 410 361 369 376 383 390 397 404 411

The Callisto variant accounts for the moon's 16.69-Earth-day period, which is a bit more complicated. A month consists of two weeks. The first week is eight days long and the second week varies between eight and nine days long. Months are not named, but appear on the calendar layout as a lengthy 16 or 17 day "week". Like the Ganymede variant, the Callisto variant is perpetual.

January
Sun Mon Tue Wed Thu Fri Sat Ura Sun Mon Tue Wed Thu Fri Sat Ura Nep
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102

102

125

103

126

104

127

105

128

106

129

107

130

108

131

109

132

110

133

111

134

112

135

113

136

114

137

115

138

116

139

117

140

118

141

119

142

120

143

121

144

122

145

123

146

124

147


The days of the week are the same as the Gregorian calendar, with the additional days Uraniday and Nepday.

EpochEdit

To simplify the equation necessary to convert Gregorian dates to Jovian dates, a common epoch is needed. The Jovian calendar follows the same epoch as the Holocene calendar. This means that January 1, 0000 on the Davidian Jovian Calendar is equivalent to January 1, 10001 BCE of the Gregorian calendar. This means that every date in recorded history is expressed in positive-numbered years.

Calendar dates use the suffix DJ, to distinguish them from BCE/BC and CE/AD (Gregorian) and HE (Holocene). For dates that occurred before the epoch, negative numbers are used. For example, 2000 years before Year 0 would be expressed as -2000 DJ.


ConversionEdit

The Davidian Jovian Calendar is designed to be converted back and forth between Davidian and Gregorian dates.

Gregorian to DavidianEdit

The formula for converting Gregorian (Earth) dates to Davidian (Jovian) dates:

( (ED + 10000) * 365.26) / 4331.572

  • Where "ED" = Earth Date

For example:

July 20, 1969 (1969.5479) is equivalent to April 360, 1009 (1009.3327).

( (1969.5479 + 10000) X 365.26) / 4331.572 = 1009.3327

Davidian to GregorianEdit

The formula for converting Davidian (Jovian) dates to Gregorian (Earth) dates:

( (JD X 686.98) / 365.26) - 10000

  • Where "JD" = Jovian Date

For example:

August 215, 1009 (1009.6326) is equivalent to January 1, 1973 (1973.0006)

( (6365.9178 X 4331.572) / 365.26) - 10000 = 1973.0006

Historical EventsEdit

Major world historical events, shown in Davidian, Gregorian, and Holocene dates. Note: approximate "circa" dates are rounded and do not calculate directly.

Events Davidian

(Jupiter)

Gregorian

(Earth)

Holocene

(Earth)

End of the Paleolithic Period,

All continents (except Antarctica) inhabited,
Agriculture and the domestication of animals begins.

c. 0 DJ c. 10000 BCE c. 0 HE
Earliest walled city (Jericho) c. 84 DJ c. 9000 BCE c. 1000 HE
First copper found in Middle East - beginning of Copper Age c. 337 DJ c. 6000 BCE c. 4000
Beginning of Indus Valley Civilization c. 590 DJ c. 3000 BCE c. 7000
Probable date of the completion of the first Egyptian pyramid January 623 2611 BCE 7390
Moses leads the Hebrews out of Egypt c. April 738 c. 1245 BCE c. 8748
Foundation of Rome October 779 753 BCE 9248
Imperial China, Qin dynasty August 824 221 BCE 9780
Birth of Jesus Christ November 842 5 BCE 9996
Possible year of Jesus' crucifixion October 845 30 CE 10030
Fall of Rome May 883 476 10476
Muslim conquests begin July 896 632 10632
Black Death decimates Asia and Europe 956 1340s 11340s
European discovery of the New World February 969 1492 11492
The United States of America declares independence from Britain January 236, 993 July 4, 1776 July 4, 11776
French Revolution February 302, 994 July 14, 1789 July 14, 11789
American Civil War March-July 1000 1861-1865 11861-11865
World War I September-December 1004 1914-1918 11914-11918
World War II October 1006-April 1007 1939-1945 11939-11945
First human landing on the Moon April 360, 1009 July 20, 1969 July 20, 11969
Pioneer 10 flyby of Jupiter September 151, 1009 December 3, 1973 December 3, 11973
Shoemaker-Levy Collison with Jupiter June 102-108, 1011 July 16-22, 1994 July 16-22, 11994
Galileo Spacecraft arrives at Jupiter July 251, 1011 December 7, 1995 December 7, 11995
September 11 Terrorist Attacks January 188, 1012 September 11, 2001 September 11, 12001
Current Year October 1012 2010 12010

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