synodic month definition

  • noun:
    • See lunar thirty days.
    • monthly of around 29.53 times, calculated from a lunar phase before return of that exact same period. The lasting average timeframe is 29.530 588 days (29 d 12 h 44 min 2.8 s), or just around 29 ½ times.
    • the variably cyclic period from a single new moon before after that.
    • the time scale between consecutive brand-new moons (29.531 days)

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