According to the Acupuncture Meridian System, discovered by the first philosophers and practitioners of Traditional Chinese Medicine, the vital fluid named Qi builds and permeates all things in Nature, shaping mineral, plants and animals. Qi flows within the acupuncture meridian system and related organs with a 24-hour cycle and a 2-hour passage for each meridian/organ, with maximum and minimum peaks. Initially the author drew this diagram for his exclusive use and research, but seen that everyone who saw it asked him to get a copy, he began the procedure of the publication on the smartphone app market. Now it is considered one of the best conceived picture/diagram representing the 24-hour Qi-Flow in the 12 main meridians.