Science / Tides and Currents / Metonic Cycle: A period of almost 19 years or 235 lunations. Devised by Meton, an Athenian astronomer who lived in the fifth century B.C., for the purpose of obtaining a period in which new and full Moon would recur on the same day of the year. Taking the Julian year of 365 .25 days and the synodical month as 29.530,588 days, we have the l9-year period of 6,939.75 days as compared with the 235 lunations of 6,939.69 days, a difference of only 0.06 day.
Cycle Verb Synonyms: slow, methodical, careful, unhurried, paced, measured, regular, even, steady, sure, unhesitating, unfaltering, confident
Cycle Noun Synonyms: round, rotation, circle, course, series, sequence, run, succession, pattern
Science / Tides and Currents / Callippic Cycle: A period of four Metonic cycles equal to 76 Julian years, or 27,759 days. Devised by Callippus, a Greek astronomer, about 350 B.C., as a suggested improvement on the Metonic cycle for a period in whic MORE
Science / Tides and Currents / Lunar Cycle: An ambiguous expression which has been applied to various cycles associated with the Moon's motion. See Callippic cycle, Metonic cycle, node cycle, and synodical month. MORE