Hi again. A period of nineteen years, or 235 lunar months, is called a metonic cycle. This means the new and full moons (and all the other phases of the moon) return to the same calendar dates. So, for example, the first new moon of this year fell on January 2. If you count back 19 years, to 2003, you’d find that there was a new moon in the sky on that same date.
constellations #74: phases and cycles
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Annunciation is such a beautiful poem!!