The Istrian calendar is divided into eight months, each of which is subdivided into units called degree. Each month is characterized by the movement of Chende and Atlo in the sky from the perspective of observers on Istria.


Months are a measure of time on Istria. The Istrian calendar is subdivided into eight months, with each year beginning with Tsa and ending with Hetasha. Months on Istria are unique in that four of the Istrian months are twice as long as the other four, with each short month being 60 degrees and each long month 120 degrees.

Here is a summary of the months in chronological order, listing their names and the apparent movements of the suns from observers in each hemisphere.

Name Duration (Degrees) Apparent Movement of Suns
North Hemisphere South Hemisphere
Tsa 120 High Chende, setting Atlo Night to dawn
Mne 60 High Chende Rising Atlo
Eyimi 60 Setting Chende High Atlo
Hibar 120 Dusk to night High Atlo, rising Chende
Nga 120 Night to dawn High Atlo, setting Chende
Sruka 60 Rising Chende High Atlo
Beyra 60 High Chende Setting Atlo
Hetasha 120 High Chende, rising Atlo Dusk to night



A degree is the term used on Istria to refer to a 24 hour period of time. Precise methods of timekeeping for shorter periods of time are particularly important because "night and day" on Istria last months. Sundials are ineffectual, because the "high noon" of either sun lasts for nearly a full year, and during a full third of this time, there is no moving sun in the sky that would cause a change in the direction of shadows.

There are six degrees in a week, and their names are Sunya, Eka, Dvi, Tri, Catur, and Shash.


The seasons on Istria are primarily associated with the orbit of the planet and how much light is striking its surface. The equator of Istria is temperate nearly year round, while the poles will vary from extreme cold to blistering heat as the planet completes its orbit.

Due to this, the majority of the population on Istria travel on the Great Migration every year in order to stay within the light of the suns.