noun
lunar calendar; lunisolar calendar
Refers to a calendar based on the moon's phases. In modern Japanese, 太陰暦 often specifically means the lunisolar calendar historically used in Japan (太陰太陽暦). The term can also refer to a purely lunar calendar in astronomical contexts.
See also: 太陰太陽暦
旧暦は太陰暦の一種です。
The old Japanese calendar is a type of lunisolar calendar.
太陰暦では、月の満ち欠けを基準に日付が決まる。
In a lunar calendar, dates are determined by the phases of the moon.