7.83 Hz is the fundamental of the Schumann resonance, the electromagnetic standing wave that rings in the gap between the Earth's surface and the ionosphere. Winfried Otto Schumann predicted it in 1952; lightning around the globe keeps it faintly, continuously excited. Far below the range of hearing, it is felt as rhythm rather than pitch. In sound practice it stands for grounding and for the planet's own steady background hum, a tempo to settle into. Two very different measurements meet here. The Schumann resonance is a real electromagnetic standing wave in the cavity between the Earth's surface and the ionosphere, first calculated by the physicist Winfried Otto Schumann in 1952. The Earth-year tone comes from Cousto's octave, the length of one orbit doubled up into sound. Both are ways of listening for the planet's own timekeeping. Independent of any tradition, controlled clinical evidence that a specific frequency produces a specific health effect is limited and mixed. Auriviel presents these tunings as music and contemplative practice. This page is for general information and relaxation. Auriviel's frequency music is not medical advice, diagnosis, or treatment, and no health outcome is claimed. If you have a medical concern, please consult a qualified professional.