Tyerian Calendar

Tyerin is an alternate calendar. It is a geosolar calendar, which means it depends on the Earth rotation and its revolution around the sun.

Tyerian Calander

It starts to midnight of December 21st, the first day of Northern winter.

Season layout: Winter / Spring / Summer / Autumn

1st month: Capricorn / Aries / Cancer / Libra Week Mon Tue Wed Thu Fri W1 01 02 03 04 05 W2 06 07 08 09 10 W3 11 12 13 14 15 W4 16 17 18 19 20 W5 21 22 23 24 25 W6 26 27 28 29 30

2nd month: Aquarius / Taurus / Leo / Scorpio Week Mon Tue Wed Thu Fri W1 01 02 03 04 05 W2 06 07 08 09 10 W3 11 12 13 14 15 W4 16 17 18 19 20 W5 21 22 23 24 25 W6 26 27 28 29 30

3rd month: Pisces / Gemini / Virgo / Sagittarius Week Mon Tue Wed Thu Fri W1 01 02 03 04 05 W2 06 07 08 09 10 W3 11 12 13 14 15 W4 16 17 18 19 20 W5 21 22 23 24 25 W6 26 27 28 29 30

Time system

Time Conversion

Tyerian Unit	Tyerain Conversion	Gregorian Conversion	Significance
Jubilee	50 Years	49.8984478101 Years	Based off of the Hebrew "Year of Jubilee"
Year	4 (5) Seasons	364.258669014 Days	1 Revolution of the Earth
Season	3 Months	90.66919917 Days
Month	6 Weeks	30.223066391 Days
Week	5 Days	4.9863425925 Days
Day	10 Myriaseconds	0.9972685185 Days	1 Rotation of the Earth
Myriasecond	10 Kiloseconds	2.393(4) Hours
Kilosecond	10 Hectoseconds	14.360(6) Minutes
Hectosecond	100 Seconds	1.4360(6) Minutes
Second	1000 Miliseconds	14.360(6) Milliseconds	Uses metric prefixes
Milisecond	10 Myroseconds	14.360(6) Microseconds
Myrosecond	100 Microseconds	1.4360(6) Microseconds

Leap year

Leap years

Year	Mid-Year Days	Last Days	First Days
4	5	0	0
32	5	1	0
620	5	1	1
6520	5	2	1

Dating System

The dating system of the Tyerian Calendar is Day/Month/Year/Jubilee. Despite not being a month, The Mid-Year Week, also called Mercidoni, is the "7^th month" in the dating system.

Conversion Equation

Conversion between the day of the year in the Tyerian Calendar, d, to the day of the year in the Gregorian Calendar, z:

$z = \frac{d-11}{0.9972685185}$

$d = (0.9972685185\times z)+11$

Epoch

The epoch of the Tyerian Calendar is the equivalent of the gregorian year: 1300 AD. Anytime before 1300, instead of listing a particular jubilee just has "BJ".

Division of a Year

Seasons

Name	Division	Days
Winter	3 Months	90
Spring	3 Months	90
Mid-Year Week	1 Week	4 (5)
Summer	3 Months	94 (95)
Autumn	3 Months	90

Months

Name	Number	Season	Gregorian Equivalent	Gregorian Equivalent in a Standard Leap Year
Decari	1	Winter	December 21–January 20	December 21–January 20
Ianari	2		January 21–February 19	January 21–February 19
Febrari	3		February 20–March 21	February 20–March 20
Martari	4	Spring	March 22–April 20	March 21–April 19
Aprilari	5		April 21–May 20	April 20–May 19
Mai'ari	6		May 21–June 19	May 20–June 18
Mid-Year (Mercidoni)	7	Summer	June 20–June 22	June 19–June 22
Iunari	8		June 23–July 22	June 23–July 22
Iulari	9		July 23–August 21	July 23–August 21
Augustari	10		August 22–September 20	August 22–September 20
Septari	11	Autumn	September 21–October 20	September 21–October 20
Octari	12		October 21–November 19	October 21–November 19
Novari	13		November 20–December 20	November 20–December 20

Days of the week

Name	Number	Type
Monday	1	Weekday
Tuesday	2	Weekday
Wednesday	3	Weekday
Thursday	4	Weekday
Friday	5	Weekend

Holidays

US Holidays

Holiday	Date
Tyerian New Years	Decari 1
Christmas	Decari 4
Kwanza	Decari 5–Decari 11
New Years Eve	Decari 10
New Years	Decari 11
Epiphany	Decari 16
MLK Jr. Day	Decari 29
Ground Hog Day	Ianari 13
Valentine’s Day	Ianari 25
Jubilee	Febrari 3
Good Day	Febrari 13
St. Patrick’s Day	Febrari 14
Easter	Febrari 15
Cinco de Mayo	Martari 25
Pentecost	Aprilari 4
Father’s Day	Mai'ari 1
Columbus Day	Septari 21
Halloween	Octari 10
All Saints’ Day	Octari 11
Thanksgiving	Novari 6
Chanukah	Novari 17–Novari 24
Tyerian New Year's Eve	Novari 30