lunations

lunations
n. lunar month, period of time averaging from about 29.5 days that passes between two sequential new moons

English contemporary dictionary. 2014.

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  • Callippic cycle — In astronomy and calendar studies, the Callippic cycle (or Calippic) is a particular approximate common multiple of the year (specifically the tropical year) and the synodic month, that was proposed by Callippus in 330 BC. It is a period of 76… …   Wikipedia

  • Metonic cycle — Heliocentric Solar System In astronomy and calendar studies, the Metonic cycle or Enneadecaeteris (from Greek words for nineteen years) is a period of very close to 19 years which is remarkable for being very nearly a common multiple of the solar …   Wikipedia

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