https://www.merriam-webster.com/dictionary/Metonic%20cycle
METONIC CYCLE Definition & Meaning - Merriam-Webster
The meaning of METONIC CYCLE is a period of 19 years after the lapse of which the phases of the moon return to a particular date in the calendar year.
cycledefinitionmeaningmerriamwebster
https://www.metonicrecords.com/
METONIC RECORDS - NEWS
recordsnews
https://ia.wikipedia.org/wiki/Cyclo_Metonic?action=edit&redlink=1
Creation de Cyclo Metonic - Wikipedia, le encyclopedia libere
creationdecyclowikipediale
https://simple.wikipedia.org/wiki/Metonic_cycle
Metonic cycle - Simple English Wikipedia, the free encyclopedia
simple english wikipediathe freecycleencyclopedia