monththe

Monththe is a term used in calendar theory and worldbuilding to designate a time unit based on the synodic lunar cycle. In this context, a monththe is intended as a neutral month that can be used in calendars attempting to synchronize lunar and solar cycles, without prescribing a fixed day count across cultures.

Etymology and scope: The name combines the English word month with the suffix -the, a conventional label in some construct-kinds for time units. The term does not denote a specific cultural calendar, but rather a theoretical unit used in comparative discussions of lunar and solar reckoning.

Length and variants: In practice, monththe can be defined as roughly 29.5 days, the average length of the synodic month. However, many calendar schemes treat monththe lengths as 29 or 30 days and insert leap months as needed to keep astronomical alignment. Some models fix a constant 29.530589 days for precision.

Applications and reception: Monththe appears in academic writings on calendar design, as well as in science fiction and fantasy worldbuilding, where it provides a neutral unit for simulating time without bias toward any real-world calendar. The concept facilitates discussion of intercalation, leap months, and the Metonic-like alignment across systems.

See also: Lunar month, Lunation, Metonic cycle, Calendar, Timekeeping, Conworlding.