lunisolar calendar
Noun: A calendar system that synchronizes its dates by incorporating the cycles of both the Moon (lunar months) and the Sun (solar year). It aims to keep the calendar months aligned with the phases of the Moon while also ensuring the calendar year stays in step with the astronomical seasons defined by the solar year.
The term "lunisolar calendar" is used to describe and classify specific calendar systems that employ intercalation (the addition of extra days or months) to reconcile the shorter lunar year with the longer solar year.
Examples: - The traditional Chinese calendar is a well-known lunisolar calendar. - Determining the date for Easter involves calculations based on a lunisolar calendar. - Many ancient cultures, including the Hebrew and Hindu systems, developed lunisolar calendars.
- Technical Context: In astronomy and historical studies, a lunisolar calendar is analyzed for its method of intercalation, such as the Metonic cycle which adds seven extra months over a 19-year period.
- Comparative Discussion: The term is often used in contrast to purely lunar calendars (like the Islamic Hijri calendar) or purely solar calendars (like the Gregorian calendar).
- Calendar (n): Any system for organizing days, typically based on astronomical cycles.
- Solar Calendar (n): A calendar based solely on the Earth's revolution around the Sun.
- Intercalation (n): The insertion of a day, week, or month into a calendar to correct its drift from the astronomical cycle.
- Lunisolar system
- Luni-solar calendar (alternative hyphenated spelling)
- Metonic Cycle: A period of approximately 19 years after which the phases of the Moon repeat on the same calendar dates in a lunisolar system.
- Embolismic Month: An intercalary month added in some lunisolar calendars to realign with the solar year.
- Keeping the Months and Seasons Aligned: A common phrase describing the primary goal of a lunisolar calendar.
- a calendar based on both lunar and solar cycles