Adjective
Alt. of Synodical
Source: Webster's dictionaryA 19-year cycle of 235 synodic months has 991 weeks 2 days 16 hours 595 parts, a common year of 12 synodic months has 50 weeks 4 days 8 hours 876 parts, while a leap year of 13 synodic months has 54 weeks 5 days 21 hours 589 parts. Source: Internet
Accordingly, 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