This cycle is known as the Horary cycle. As the Qi makes its way through the meridians, each meridian in turn, with its associated organ, has a two-hour period during which it is at maximum energy. The Horary Effect is recognizable by measurable increases of Qi within an organ system and meridian during its time of maximum energy.
The TCM information presented here has been referenced from numerous sources; including teachers, practitioners, class notes from Five Branches University, the following books, as well as other sources. If you have benefited from this information, please consider supporting the authors and their works by purchasing the books below.
Applied Channel Theory in Chinese Medicine Wang Ju-Yi's Lectures on Channel Therapeutics
Chinese Acupuncture and Moxibustion (Third Edition 2009, Seventeenth Printing 2016)
Pictorial Atlas of Acupuncture: An Illustrated Manual of Acupuncture Points
Grasping the Wind: An Exploration Into the Meaning of Chinese Acupuncture Point Names