If you follow the circumference of a period of time, you end up back at the beginning and it makes a full cycle. Events in history always repeat, right?
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
I await your response regarding the cycle of a pendulum.
Actually, I've been practicing a song called "The Moon Cycle" because I wanted to play it for you, Kristen.
Tohoku’s weather changes in short cycles.