Circular Lunisolar Calendars were publishing for 17 years (1998 - 2014).
They are luni-solar in the sense of the coexistence of lunar and solar calendar data but do not follow the calendar system defined by this term (1). The calendars year is as defined by the Gregorian calendar. It starts on 1st of January and ends on 31st of December. The months also follow the conventional months of the Gregorian calendar (2).
Their design is original. Some of them had initially some small texts and later came with slim booklets with various information related to time and the calendar but also on some general interest topics.
The publications were in Greek language.(3)
- The term Lunisolar refers to calendars that indicates both the tropical solar year of average duration of 365.25 days and the Moon phases, the synodic lunar month of average duration of 29.5 days. (In contrast with the Gregorian or other purely solar calendars, where the term month has nothing to do with the Moon cycle). At lunisolar calendars, in order to have a whole number of lunar months, years do not have a fixed number of days. Ordinary years consist of 12 lunar months (354 days), but every 2 or 3 years an embolismic month is inserted and thus resulting years of 13 lunar months (384 days). With this method, seasons and lunar months are synchronized in a cycle of 19 solar (tropical) years or 235 lunar months. This circle (also known as the Metonic cycle) is actually the full cycle of a lunisolar calendar.
- The 2014 Circular Lunisolar calendar referred to the true -synodic- months of the Moon.
- The 2014 Circular Lunisolar calendar was published in English language.