Relating to or consisting of nineteen items or occurring every nineteen years, based on the ancient Greek metonic cycle.
From Latin decem (ten) and novem (nine), creating a compound meaning nineteen. This technical term is used primarily in astronomical and calendrical contexts, particularly related to the 19-year metonic cycle discovered by ancient Greek astronomers.
The metonic cycle—a 19-year period where the Moon's phases realign with the solar year—was discovered by the Greek astronomer Meton around 432 BCE and is so accurate that some calendars still use it today! Decennoval cycles are the hidden mathematical pattern behind when Easter falls.
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