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calendar:yamatai

Yamataian Calendar

The Yamataian Calendar is the standard calendar system used in and around the Yamatai Star Empire. It is also used by the Democratic Imperium of Nepleslia, which adopted the calendar while it was a part of Yamatai, and by the Elysian Celestial Empire for external affairs (internally, it uses the Elysian Calendar).

Yamataian calendar dates are usually written by Yamataians in the format: 25日 8月 YE 39 (DD MM YY), while Nepleslians use 8/25/34 (MM/DD/YY).

History

Prior to YE 39, many in Yamatai and Nepleslia also used a 12-month, 365-day “operational calendar” that was introduced by the Nerimian Defense Initiative, an allied military, when the Grand Star Army was still being formed. As of YE 39, this practice has largely been dropped and is no longer standard in the Star Army of Yamatai.

For history in general, see Timeline.

Years

The years of the Yamataian calendar are preceded by the notation “YE” which is short for “Year of the Empire” and/or “Yamatai era.” YE 01 is the first year of the Empire, YE 02 is the second year of the empire, and so forth. The YE is followed by one space, and then the number (YE 04, not YE-04 or YE04). The first 9 years are typically written with two digits (YE 03, not YE 3). The Yamataigo symbol for year is 年 (nen), used as in “22年.”

The years contain 315 days, based on the rotations of the Planet Yamatai around its star.

Months

The Yamataian year is divided into 9 months, each consisting of 35 days.

Months are most commonly written in arabic numbers followed by the “month” kanji 月 (gatsu), e.g 7月. In Trade this is usually written as 7/01 (for the first day of the seventh month), etc.

Month Name Notable Events OOC Month
1月 一月 (ichigatsu) 👘 Coming of Age Day January 1-February 10th
2月 二月 (nigatsu) 💖 Love Day February 11-March 22
3月 三月 (sangatsu) 🌸 Hanami March 23-May 2
4月 四月 (shigatsu) 🎏 Children's Day May 3-June 11
5月 五月 (gogatsu) 🌼 Kikyō No Sekku June 12-July 22
6月 六月 (rokugatsu) July 23-August 30
7月 七月 (shichigatsu) August 31-October 11
8月 八月 (hachigatsu) 🍬 Candy Festival October 12-November 21
9月 九月 (kugatsu) 🎄 Year-End Traditions November 22-December 31

Age

Age is expressed in a straightforward count in years and is written with the kanji 歳 (sai), for example, 20歳 for someone who was born 20 years ago. It is common for people to use their original or cumulative age, not the age of their bodies, if they transfer their consciousness into a new body.

Days

There are 315 days in each year on the Yamataian Calendar and 35 in each month. There are 24 hours in each day. The Yamataigo (邪馬台語) kanji for day is 日. For example, 35日 means “Day 35” or “The 35th Day.”

Days of the Week

There are 7 days of the week and 5 weeks in every month. Yamataians consider Moon Day the first day of the week. The first day of the month (and year) is always a Moon Day and the last day of the year and month is always a Sun Day.

Day Yamataigo Name Meaning Trade Name
1st 月曜日 (getsuyōbi) Moon Day Moonday or Monday
2nd 火曜日 (kayōbi) Fire (Mars) Day Tuesday
3rd 水曜日 (suiyōbi) Water (Mercury) Day Wednesday
4th 木曜日 (mokuyōbi) Wood/Tree (Jupiter) Day Thursday
5th 金曜日 (kin'yōbi) Metal/Gold (Venus) Friday
6th 土曜日 (doyōbi) Earth (Saturn) Day Saturday
7th 日曜日 (nichiyōbi) Sun Day Sunday (“Gun Day” in Nepleslia)

Days of the Month

This section has the Yamataigo name for each day of the month and what day of the week it falls on.

Day Yamataigo Name Falls on
1日 一日 (tsuitachi) 月曜日 (getsuyōbi) / Moonday
2日 二日 (futsuka) 火曜日 (kayōbi) / Tuesday
3日 三日 (mikka) 水曜日 (suiyōbi) / Wednesday
4日 四日 (yokka) 木曜日 (mokuyōbi) / Thursday
5日 五日 (itsuka) 金曜日 (kin'yōbi) /Friday
6日 六日 (muika) 土曜日 (doyōbi) / Saturday
7日 七日 (nanoka) 日曜日 (nichiyōbi) /Sunday
8日 八日 (yōka) 月曜日 (getsuyōbi) / Mon
9日 九日 (kokonoka) 火曜日 (kayōbi) / Tue
10日 十日 (tōka) 水曜日 (suiyōbi) / Wed
11日 十一日 (jūichi-nichi) 木曜日 (mokuyōbi) / Thu
12日 十二日 (jūni-nichi) 金曜日 (kin'yōbi) / Fri
13日 十三日 (jūsan-nichi) 土曜日 (doyōbi) / Sat
14日 十四日 (jūyokka or jūyon-nichi) 日曜日 (nichiyōbi) / Sun
15日 十五日 (jūgo-nichi) 月曜日 (getsuyōbi) / Mon
16日 十六日 (jūroku-nichi) 火曜日 (kayōbi) / Tue
17日 十七日 (jūshichi-nichi) 水曜日 (suiyōbi) / Wed
18日 十八日 (jūhachi-nichi) 木曜日 (mokuyōbi) / Thu
19日 十九日 (jūkyū-nichi or jūku-nichi) 金曜日 (kin'yōbi) / Fri
20日 二十日 (hatsuka) 土曜日 (doyōbi) /Sat
21日 二十一日 (nijūichi-nichi) 日曜日 (nichiyōbi) /Sun
22日 二十二日 (nijūni-nichi) 月曜日 (getsuyōbi) / Mon
23日 二十三日 (nijūsan-nichi) 火曜日 (kayōbi) / Tue
24日 二十四日 (nijūyokka or nijūyon-nichi) 水曜日 (suiyōbi) / Wed
25日 二十五日 (nijūgo-nichi) 木曜日 (mokuyōbi) / Thu
26日 二十六日 (nijūroku-nichi) 金曜日 (kin'yōbi) / Fri
27日 二十七日 (nijūshichi-nichi) 土曜日 (doyōbi) / Sat
28日 二十八日 (nijūhachi-nichi) 日曜日 (nichiyōbi) / Sun
29日 二十九日 (nijūkyū-nichi or nijūku-nichi) 月曜日 (getsuyōbi) / Mon
30日 三十日 (sanjū-nichi) 火曜日 (kayōbi) / Tue
31日 三十一日 (sanjūichi-nichi) 水曜日 (suiyōbi) / Wed
32日 三十二日 (sanjūni-nichi) 木曜日 (mokuyōbi) / Thu
33日 三十三日 (sanjūsan-nichi) 金曜日 (kin'yōbi) / Fri
34日 三十四日 (sanjūyokka or sanjūyon-nichi) 土曜日 (doyōbi) / Sat
35日 三十五日 (sanjūgo-nichi) 日曜日 (nichiyōbi) / Sun

Time of Day

Time is expressed in hours. Each standard day has 24 hours in it. Traditionally there are 60 minutes in an hour, and time is expressed in a 24-hour clock. For example, 20:15 for a quarter past 8 p.m.

Starship personnel often use decimal fractions instead of minutes. For example: 21.50 for half past nine p.m.

Yamatai does not have time zones or daylight savings time. Time is aligned with Kyoto so early on the clock is also early in Kyoto.

Many inhabited planets also have their own local time systems.

Conversions

This section deals with how to convert Yamataian time into other calendars.

Abwehran

Four Yamataian calendar years are equal to one Abwehran year.

Yamataian Abwehran OOC
YE 30 259 AF - Fourth Quarter July 2007-2008
YE 31 260 AF - First Quarter 2009
YE 32 260 AF - Second Quarter 2010
YE 33 260 AF - Third Quarter 2011
YE 34 260 AF - Fourth Quarter 2012
YE 35 261 AF - First Quarter 2013
YE 36 261 AF - Second Quarter 2014
YE 37 261 AF - Third Quarter 2015
YE 38 261 AF - Fourth Quarter 2016
YE 39 262 AF - First Quarter 2017
YE 40 263 AF - Second Quarter 2018

Elysian

There are 27.6 hours in an Elysian Calendar day (or 24 Elysian hours, which are 1.15 standard hours), so there are 9,936 standard Yamataian hours in an Elysian year and 7560 in a Yamataian year, which makes their years 414 Yamataian days long. For every Yamataian year that passes, the Elysian year is incremented by 0.7608695652173913 (equal to the fraction of 35/46). The last time the calendars lined up was in YE 29, which was the Elysian year 4000.

Yamatai Elysian Year1) OOC
YE 22 3994.67 ~2002
YE 23 3995.43 ~2003
YE 24 3996.12 ~2003
YE 25 3996.96 ~2003
YE 26 3997.72 ~2004
YE 27 3998.48 2004
YE 28 3999.24 2005
YE 29 4000 2005 to June 2007
YE 30 4000.76 July 2007 to 2008
YE 31 4001.52 2009
YE 32 4002.28 2010
YE 33 4003.04 2011
YE 34 4003.8 2012
YE 35 4004.57 2013
YE 36 4005.33 2014
YE 37 4006.09 2015
YE 38 4006.85 2016
YE 39 4007.61 2017
YE 40 4008.37 2018

Hidden Sun Clan

Years of the Poku Saeruo Degonjo line up with Yamataian years almost evenly. See Kyn'ka (History). Note clan years would actually be in Octal, but are listed here in decimal on the table for convenience.

Yamatai Clan Year OOC
YE 31 750 CY 2009
YE 32 751 CY 2010
YE 33 752 CY 2011
YE 34 753 CY 2012
YE 35 754 CY 2013
YE 36 755 CY 2014
YE 37 756 CY 2015
YE 38 757 CY 2016
YE 39 758 CY 2017
YE 40 759 CY 2018

Iromakuanhe

The orbital period of Maekardan is 474 days long, and approximately 33% longer than that of Yamatai, meaning that there are 3 AR every 4 YE; therefore, the years of the Iromakuanhe Calendar increment by .75 for each Yamataian year. The start of YE 39 lines up with the start of AR 942 on the Iromakuanhe Calendar.

Yamataian Iromakunahe OOC
YE 22 AR 929.25 ~2002
YE 23 AR 930 ~2003
YE 24 AR 930.75 ~2003
YE 25 AR 931.50 ~2003
YE 26 AR 932.25 ~2004
YE 27 AR 933 2004
YE 28 AR 933.75 2005
YE 29 AR 934.50 2005 to June 2007
YE 30 AR 935.25 July 2007 to 2008
YE 31 AR 936 2009
YE 32 AR 936.75 2010
YE 33 AR 937.50 2011
YE 34 AR 938.25 2012
YE 35 AR 939 2013
YE 36 AR 939.75 2014
YE 37 AR 940.50 2015
YE 38 AR 941.25 2016
YE 39 AR 942 2017
YE 40 AR 942.75 2018

IRL/Earth Years

Although the Earth is not in the Kagami Galaxy where the RP takes place, it may be useful for OOC purposes to compare 365-day Earth years to 315-day Yamataian years.

YE to IRL IRL to YE
Yam years Earth Years Earth Years Yam Years
1 0.862422998 1 1.15952381
2 1.724845996 2 2.319047619
3 2.587268994 3 3.478571429
4 3.449691992 4 4.638095238
5 4.31211499 5 5.797619048
6 5.174537988 6 6.957142857
7 6.036960986 7 8.116666667
8 6.899383984 8 9.276190476
9 7.761806982 9 10.43571429
10 8.624229979 10 11.5952381
11 9.486652977 11 12.7547619
12 10.34907598 12 13.91428571
13 11.21149897 13 15.07380952
14 12.07392197 14 16.23333333
15 12.93634497 15 17.39285714
16 13.79876797 16 18.55238095
17 14.66119097 17 19.71190476
18 15.52361396 18 20.87142857
19 16.38603696 19 22.03095238
20 17.24845996 20 23.19047619
21 18.11088296 21 24.35
22 18.97330595 22 25.50952381
23 19.83572895 23 26.66904762
24 20.69815195 24 27.82857143
25 21.56057495 25 28.98809524
26 22.42299795 26 30.14761905
27 23.28542094 27 31.30714286
28 24.14784394 28 32.46666667
29 25.01026694 29 33.62619048
30 25.87268994 30 34.78571429

OOC Notes

Wes created this article on 2016/10/26.

It's taken us forever to detail the in-character months but I've done it, finally. I had to go with 9 months because it was the only way to divide 315 days (the canonical year of planet Yamatai) into “normal” size months and get whole numbers. Interestingly, this means if you've been using Earth years for your character's age instead of Yamataian years, your character may be younger than you thought they were! If you have a problem with that, feel free to resubmit the character with the “corrected” age.

1)
rounded to two decimal points
calendar/yamatai.txt · Last modified: 2017/07/12 08:17 by Wes