The term "Lunisolar Calendar" refers to a system of timekeeping that combines lunar and solar cycles to determine the timing of holidays and other important events. Some synonyms for this type of calendar include lunar-solar calendar, moon-sun calendar, and lunisolar system. In some cultures, such as those in East and Southeast Asia, the lunisolar calendar is still widely used to determine the dates of traditional festivals and holidays. Other cultures, such as those in the Middle East and India, have also historically used variations of the lunisolar calendar. While the term "Lunisolar Calendar" is the most commonly used in English, there are numerous other phrases and terms used to describe this complex system of timekeeping.