Tyerian Calendar

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

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

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	2.39344444442 Hours
Kilosecond	10 Hectoseconds	14.3606666665 Minutes
Hectosecond	100 Seconds	1.43606666665 Minutes
Second	1000 Miliseconds	14.3606666665 MIliseconds	Uses metric prefixes
Milisecond	10 Myroseconds	14.3606666665 Microseconds
Myrosecond	100 Microseconds	1.43606666665 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[]

Note: In the following equations "d" stands for the day of the year
To convert from the Tyerian Calendar to the Gregorian Calendar, use this equation:
$(d-11)/0.9972685185$
To convert from the Gregorian Calendar to the Tyerian Calendar, use this equation:
$(0.9972685185*d)+11$

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 ^{[nb 1]}	1 Week	4 (5)
Summer ^{[nb 1]}	3 Months	94 (95)
Autumn	3 Months	90

↑ ^1.0 ^1.1 Summer is longer than winter, due to the eliptical orbit of the Earth. It includes the Mid-Year Week, even though the Mid-Year Week is sometimes considered to not belong to a season.

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	Winter	January 21–February 19	January 21–February 19
Febrari	3	Winter	February 20–March 21	February 20–March 20
Martari	4	Spring	March 22–April 20	March 21–April 19
Aprilari	5	Spring	April 21–May 20	April 20–May 19
Mai'ari	6	Spring	May 21–June 19	May 20–June 18
Mid-Year (Mercidoni)	7	Summer	June 20–June 22	June 19–June 22
Iunari	8	Summer	June 23–July 22	June 23–July 22
Iulari	9	Summer	July 23–August 21	July 23–August 21
Augustari	10	Summer	August 22–September 20	August 22–September 20
Septari	11	Autumn	September 21–October 20	September 21–October 20
Octari	12	Autumn	October 21–November 19	October 21–November 19
Novari	13	Autumn	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
Pentacost	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

[a-1] 1.0 ^1.1 Summer is longer than winter, due to the eliptical orbit of the Earth. It includes the Mid-Year Week, even though the Mid-Year Week is sometimes considered to not belong to a season.

[nb 1]