Noun
the period between successive new moons (29.531 days)
Source: WordNetAccordingly, for convenience, a long-term average length, identical to the mean synodic month of ancient times (also called the molad interval) is used. Source: Internet
Additionally, the synodic month does not fit easily into the year, which makes accurate, rule-based lunisolar calendars complicated. Source: Internet
Due to the eccentricity of the lunar orbit around Earth (and to a lesser degree, the Earth’s elliptical orbit around the Sun), the length of a synodic month can vary by up to seven hours. Source: Internet
A synodic month is longer than a sidereal month because the Earth-Moon system is orbiting the Sun in the same direction as the Moon is orbiting the Earth. Source: Internet
A lunation or synodic month is the mean (average) time from one new moon to the next. Source: Internet
Although there're many stories to interpret the intercalation, but a period of 22 or 23 days is always 3/4 synodic month. Source: Internet