A '''lunar conjunction''' is the moment when the earth, moon and sun, in that order, are approximately in a straight line. (See Conjunction_(astronomy) for a precise definition.) It is sometimes referred to as the New_moon, though traditionally new moon refers to the first visible crescent of the moon. The period of time between two lunar conjunctions is the Synodic_month, which is a basic unit in most lunar and lunisolar Calendars such as the Islamic_calendar and the Hebrew_calendar (known in that context as the '''molad''' in Hebrew). The opposite moment, when the sun, earth and moon, in that order, are in approximately in a straight line, is a Full_moon or lunar opposition. {{astro-stub}} Category:Hebrew_calendar Conjunction