Full name: synodic month
Plural form: months
Symbol: mo
Alternate spelling: synodic months
Category type: time
Scale factor: 2551442.8
The SI base unit for time is the second.
1 second is equal to 3.9193510432607E-7 synodic month.
Valid units must be of the time type.
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A synodic month is the most familiar lunar cycle, defined as the time interval between two consecutive occurrences of a particular phase (such as new moon or full moon) as seen by an observer on Earth. The mean length of the synodic month is 29.53059 days (29 days, 12 hours, 44 minutes, 2.8 seconds). 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.