Design and implementation for calendars in use in the Eocalon setting.

There are two moons in orbit around Eocalon, which increases the range of possible astronomical calendars. No calendar in use on Eocalon has a fixed number of days in each month but rather each calendar begins a new month on the day in which the astronomical event it’s based on occurs.

Calendars on Eocalon each fall into one of the following categories:

• Prescribed phase of the smaller inner moon (usually either full moon or new moon)
• Prescribed phase of the larger outer moon
• Conjunction of the two moons

Each calendar has a specific location on Eocalon which is used as a reference point in determining the exact moment of its base astronomical event, and a time (not always midnight) when each day is considered to transition to the next. The number of months in a year varies in all calendars on Eocalon and there are multiple ways that this is handled. Calendars based on the same astronomical event but with different reference locations can sometimes yield different dates for the same time.