Espan Calendar

The Espan Calendar is a synodic calendar developed on the planet Espa. The abbreviation suffix of the Calendar is CC.

1 Year is equal to the orbital period of Espa (251 Espan synodic days, or 330.1 Earth days) This means the calendar year has a 0.9037 ratio to Earth's, meaning 1000 years on Earth would be 903.7 years on Espa.

An Espan year consists of 9 months of 27 days, including 8 leap days, making an Espan synodic year 251 Espan synodic Days.

The base point for the calendar year is the foundation of the Espan city Iswin in 0 CC.

Divisions
An Espan year synodically is 250.904548666 Espan days long, which is rounded to 251 days in an Espan year. The Espan month is based upon the orbital resonance of the Moons Azhban and Yattuk (2:3) which happens 9.15712459321 times per orbital; this is rounded to 9 months a year. To make the calendar synodic, 1 day should be taken out of the year, and 8.00968358238 minutes should be added to each day.

Each month is 27.5091319444 Espan days long, which is rounded to 27 days per month, thus resulting in 243 days per year; this leaves 7.904548666 days. Therefore 8 days are added to the 1st and 3rd to 9th month, making these months 28 days long.

This leaves 0.095451334 days short each year, which every 11 years results in the subtraction of the last day of the 8th month. A period of 11 years is called a Dizhi.

This still leaves 0.004542243091 days short each year, which every 220 years results in the subtraction of the last day of the 2nd month (this month has 26 days in such a year). Since 220 is a multiple of 11, this happens in addition to the subtraction of the last day of the 8th month. A period of 220 years is called a Heikash.

This then takes 0.000003211454 days long each year, which means the Heikash subtraction is skipped every 311,080 years.

Now only 0.000000003153 days are left each year, giving the calendar an accuracy of 317,301,600 Espan years.

Additionally, the orbital resonance of Azhban and Yattuk (2:3) which happens 9.15712459321 times per orbital, leaves 0.15712459321 months per year. Therefore every 6 years an additional leap month called Tengmash is added. A 6 year period on Espa is called a Toro.

This leaves 0.0607293439 months per year, which every 16 years accumulates into another leap month called Renemash. A 16 year period is called a Detlo.

This leaves 0.02915651616 months per year, which every 34 years accumulates into yet another leap month called Ozhgush. A 34 year period is called an Tlalish.

This leaves 0.008754425339 months per year, which every 114 years accumulates into yet another leap month called Ugbash. A 114 year period is called an Lutlash.

This leaves 0.001999501395 months per year, which every 500 and 4010 years accumulates into two other leap months called Nuruzh and Borozh.

Which only rests a mere 0.0000466835665 months per year, giving the calendar an accuracy of 21,420 Espan years.

Every 48 years Tengmash and Renemash fall into the same year, Tengmash and Ozhgush fall in the same year every 102 years, Renemash and Ozhgush fall in the same year every 272 years, Tengmash Renemash and Ozhgush fall in the same year every 816 years, Tengmash and Ugbash fall in the same year every 114 years, Renemash and Ugbash fall in the same year every 912 years, Ozhgush and Ugbash fall into the same year every 1938 years and all four of them fall in the same year every 15,504 years.