Definition of synodic month in US English:

synodic month


  • another term for lunar month
    • ‘One could quite quickly determine the length of the synodic month by counting the days between full moons.’
    • ‘The two cycles are incompatible in that the synodic month has a period of about 29.5 days, giving a lunar year of just over 354 days, over 11 days shorter than the mean solar year of 365.2422 days.’
    • ‘If the Moon orbited the Earth in a perfect circle, the synodic month - using any starting point (new Moon to new Moon, full Moon to full Moon) - would never vary.’