Metonic Cycle: The nineteen-year cycle named for the Athenian astronomer Meton who discovered (ca. 432) that the new Moon occurs on the same day of the year at approximate nineteen-year intervals.

 

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Metonic Cycle: The nineteen-year cycle named for the Athenian astronomer Meton who discovered (ca. 432) that the new Moon occurs on the same day of the year at approximate nineteen-year intervals.

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.

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 peri . . . View Full Definition

Motorcycle: Motorcycles are 2-wheel vehicles patterned after bicycles but with engines and much heavier frames. Early motorcycles were actually bicycles fitted with small internal combustion engines. Th . . . View Full Definition

Motorcycle Assembly: The putting together of manufactured parts to make a completed motorcycle, or the set of parts so assembled.

Mystery Cycle: A collection of mystery plays in a single manuscript meant to be performed sequentially. See discusion under mystery play, below.

Node Cycle: Period of approximately 18.61 Julian years required for the regression of the Moon's nodes to complete a circuit of 360° of longitude. It is accompanied by a corresponding cycle of changing . . . View Full Definition

New Werner Motorcycle: Unveiled at the 1901 Cycle & Motor Show in Paris, the “New Werner” is one of the early motorbikes to have its engine mounted in the lower part of the frame (most motorcycles since then use t . . . View Full Definition

Motorcycle Safety Foundation (MSF): The Motorcycle Safety Foundation is a US national, not-for-profit organization sponsored by the U.S. manufacturers and distributors of BMW, Ducati, Harley-Davidson, Honda, Kawasaki, KTM , Pi . . . View Full Definition

Menstrual Cycle: The recurring secretion of hormones and associated uterine tissue changes; typically 28 days in length.